BioTIME 2.0: Expanding and Improving a Database of Biodiversity Time SeriesABSTRACTMotivationMain Types of Variables IncludedSpatial Location and GrainTime Period and GrainMajor Taxa and Level of MeasurementSoftware Format - Dornelas, Maria; Antão, Laura H.; Bates, Amanda E.; Brambilla, Viviana; Chase, Jonathan M.; Chow, Cher F. Y.; Fontrodona‐Eslava, Ada; Magurran, Anne E.; Martins, Inês S.; Moyes, Faye; Sagouis, Alban; Adu‐Acheampong, Samuel; et al. (Global Ecology and Biogeography, 2025)
Motivation Here, we make available a second version of the BioTIME database, which compiles records of abundance estimates for species in sample events of ecological assemblages through time. The updated version expands version 1.0 of the database by doubling the number of studies and includes substantial additional curation to the taxonomic accuracy of the records, as well as the metadata. Moreover, we now provide an R package (BioTIMEr) to facilitate use of the database. Main Types of Variables Included The database is composed of one main data table containing the abundance records and 11 metadata tables. The data are organised in a hierarchy of scales where 11,989,233 records are nested in 1,603,067 sample events, from 553,253 sampling locations, which are nested in 708 studies. A study is defined as a sampling methodology applied to an assemblage for a minimum of 2 years. Spatial Location and Grain Sampling locations in BioTIME are distributed across the planet, including marine, terrestrial and freshwater realms. Spatial grain size and extent vary across studies depending on sampling methodology. We recommend gridding of sampling locations into areas of consistent size. Time Period and Grain The earliest time series in BioTIME start in 1874, and the most recent records are from 2023. Temporal grain and duration vary across studies. We recommend doing sample-level rarefaction to ensure consistent sampling effort through time before calculating any diversity metric. Major Taxa and Level of Measurement The database includes any eukaryotic taxa, with a combined total of 56,400 taxa. Software Format csv and. SQL.

Carbon dioxide emissions from coastal waters and mangrove sediments in a microtidal bay under tropical monsoon climate (Martinique, Lesser Antilles) - Abril, Gwenaël; Narayaninsamy, Mélissa; David, Frank; Chielle, Raisa; Le Moal, Pierre; Meziane, Tarik (Estuarine, Coastal and Shelf Science, 2025)

Coastal to Riverine Entry Timing During the Spawning Migration of the European Shads (Alosa spp.): Drivers and Phenological Trends for the French Atlantic Coast Populations - Cherbero, Mikel; Teichert, Nils; De Oliveira, Eric; Le Pichon, Céline (Aquatic Conservation: Marine and Freshwater Ecosystems, 2025)
During the spawning migration of the anadromous allis Alosa alosa and twaite Alosa fallax shads, timing of river entry is decisive to ensure that arrival in the spawning grounds matches with favourable conditions for reproductive success. Identifying the environmental cues that drive the timing of river entry is therefore crucial to understanding the implications of climate change for shad populations and to implementing management measures for these threatened species. In this study, data from fisheries and fish counting stations located in the estuaries or low reaches of 10 rivers were combined to investigate the effects of coastal, river conditions and abundance on the timing of migration. Phenological trends were quantified at five sites with more than 20 years' monitoring, and we analysed whether these trends aligned with the period when river temperatures were in the most favourable range for offspring survival. The results indicated that the temporality of spring warming in coastal habitats and photoperiod were key drivers influencing river entry timing. Their relative influence varied between models predicting migration initiation, median and end dates. Significant shifts toward earlier and longer migration periods were quantified. At the site with the longest monitoring time series, the shift in migration timing increased the time lag between early shad arrival and the period of most favourable breeding temperatures. Therefore, further studies should assess the repercussions of earlier spawning migration on the phenology and success of reproduction and juvenile stages.

Condition assessment and best-practice handling guidelines for skate (Rajiformes) bycatch: Lessons from demersal longline fisheries in the Southern Indian Ocean - Faure, Johanna; Clara Péron; Jones, Rob; Grima, Michael; Appert, Colette; Nicolas Gasco; Lamb, Timothy; Ziegler, Philippe; Cleeland, Jaimie (Fisheries Research, 2025)

Daily and seasonal spatial behaviour of waved whelk Buccinum undatum: implications for fishery management and restoration - Uboldi, Thomas; MacGregor, K. A.; Lavoie, M-F.; McKindsey, C. W.; Gendreau, Y.; Pettré, J.; Chauvaud, Laurent; Olivier, F.; Tremblay, Rejean (Canadian Journal of Zoology, 2025)
Many marine invertebrate fisheries are vulnerable to overexploitation and require conservation measures to ensure their sustainability. In recent years, landings of waved whelk Buccinum undatum (Linnaeus, 1758) have fallen considerably along the coasts of the St. Lawrence (Canada), dropping by up to 76% in some fishing areas. Local overfishing may be explained, in part, by the species’ oviparous reproduction, which limits larval dispersion and population interactions. Using a two year long-term acoustic telemetry study, we tracked 20 individuals to assess their general movement behaviour and potential to disperse within an area. Tagged individuals displayed considerable daily movements (from a mean of 2 to 16 m/h), with no sensible differences between day and night. Both speed and habitat usage potential (HUP) varied among seasons, most likely due to the species' reproductive cycle: HUP was significantly larger during the breeding season of May (4570 m2) and June (2779 m2) than in the preceding winter months (1046 m2). Although some individuals moved over a considerable depth range, we did not observe seasonality over the bathymetric gradient of the area. Overall, the species' restricted HUP limits individual dispersal, resulting in very poor connection between neighbouring populations and making B. undatum vulnerable to local overfishing.
Keywords: Acoustic telemetry; Behaviour; Buccinum undatum; fishery management; Gastropoda; maritime estuary; movement ecology; overfishing; shellfish

Description of the behavioural contexts of underwater sound production in juvenile green turtles Chelonia mydasAbstract - Maucourt, Léo; Charrier, Isabelle; Huetz, Chloé; Aubert, Nathalie; Bourgeois, Ouvéa; Jeantet, Lorène; Lecerf, Nicolas; Lefebvre, Fabien; Lelong, Pierre; Lepori, Muriel; Martin, Jordan; Régis, Sidney; et al. (Behavioral Ecology and Sociobiology, 2025)
Green sea turtles Chelonia mydas have the ability to hear and produce sounds under water, with some of them potentially involved in social communication. To investigate the potential biological function of these sounds, we used a combination of acoustic, video and multi-sensor recordings of 23 free-ranging juvenile green turtles and we examined the co-occurrences of sounds with behaviours or external events. Our study revealed that most of the sounds were produced when the sea turtles were resting or swimming. However, four sound types were produced in more specific contexts. Long sequences of rumbles were recorded after sunset and mainly during resting. All these rumbles appear to have been produced by several individuals recorded simultaneously, suggesting that rumbles may be used for social interactions. The frequency modulated sound was highly associated with scratching behaviour. The grunt that was produced occasionally when green turtles were vigilant or approaching a conspecific. The long squeak was produced significantly by a small number of individuals in the presence of humans. The grunt and the long squeak may be the first evidence of an alarm or warning signal for intra-specific communication in green turtles. Our results mark a significant milestone in advancing the understanding of sound production in the behavioural ecology of sea turtles. Further experimental investigations (i.e., playback experiments) are now required to test the hypotheses suggested by our findings. Warning signals could be used to prevent sea turtles of a danger and may contribute to their conservation.
Keywords: Behaviour; Chelonia mydas; Chelonians; juveniles; Underwater sound production

Diel Vertical Migration Shapes North Atlantic Copepod Bioregions - Vilain, Marion; Goberville, Eric; Vincent, Dorothée; Benedetti, Fabio; Olivier, Frédéric (Journal of Biogeography, 2025)
Aim: Assessing the influence of diel vertical migration (DVM) on biogeographic patterns to improve the macroecological characterisation of the structure and function of zooplankton communities. Location: North Atlantic Ocean and adjacent seas. Taxon: Marine copepod species. Methods: We base our bioregionalisation on Continuous Plankton Recorder (CPR) data of copepod species abundances from 1966 to 2021. We separate day and night samples using the solar elevation corresponding to civil twilight. For each condition, we interpolate abundances onto a grid adapted to the irregular sampling effort. We then generate a bipartite network (geographical cells—species) on which we apply the Map Equation clustering algorithm to delineate bioregions and identify their underlying copepod communities. We use canonical correspondence analyses to characterise the resulting bioregions in terms of environmental forcings, species composition and community-weighted mean traits. Results: We identify four bioregions for both day and night partitions, with dynamic transitions and changes in spatial patterns as well as in community composition between day and night. While environmental forcings seem to transcend diel variations, ecological features of bioregions show day/night discrepancies: higher copepod diversity at night is driven by changes in species composition mediated by diel vertical migration. Main Conclusions: We highlight how day/night variations driven by highly migratory copepod species shape community spatial patterns and species composition. We uncover distinct levels of functional diversity across bioregions, suggesting different responses of copepod communities to environmental changes. Transition zones emerge as crucial markers of pelagic bioregion connectivity, emphasising their dynamic nature. Embracing a partitioning approach that better captures these dynamics is essential for understanding how ecosystems function and will evolve in response to climate changes.

Effectiveness of an Electrical Barrier to Improve Silver Eel (ABSTRACT - Sonny, D.; Beguin, J.; De Oliveira, E.; Theunissen, P.; Lerquet, M.; Roy, R.; Teichert, Nils (River Research and Applications, 2025)
The European eel population is in severe decline, leading to several regulations to save the species from extinction. Various factors impact various stages of the complex lifecycle of this species, and improving the survival of silver eels migrating downstream through turbines is essential in hydropower plants (HPPs). While adapted physical barriers ensure total protection in new small HPPs, effective solutions are still needed for larger existing facilities. An electrical barrier was installed across the forebay of 160 m3 s−1 HPP. An acoustic telemetry study compared silver eel passage via the dam versus the turbines between reference values in the year prior to the installation of the barrier versus migration after installation and operation of the electrical barrier. The dam passage rate increased significantly with the electrical barrier, in hydrological conditions similar to those of the reference year. Under flow conditions where the nonturbine flow was the lowest, a reduction of 52% in turbine passage could be explained by the electrical barrier. While this efficacy is far from perfect, the results encourage using this technology in large HPPs as a first step in eel protection. At our pilot study site, the technology was adopted as a permanent solution, associated with turbine shutdown according to an eel migration prediction model.

Environmental preferences of green sea turtles (Chelonia mydas) for egg-laying on a fringing reef pocket beach, Mayotte Island - Sophie Morisseau; Matthieu Jeanson; Sarah Charroux; Yann Mercky; Charles Le Bozec; Michel Charpentier; Lucas Le Gall; Cyrielle Delvenne; Marc Girondot; Elliott Sucré; Chevallier, Damien (Frontiers in Marine Science, 2025)
Understanding the spatial ecology of sea turtles is essential to ensure their long-term conservation by the preservation of their environment. The distribution and environmental preferences for egg-laying by the green turtle (Chelonia mydas) were studied on Grande Saziley beach in Mayotte (north of the Mozambique Channel). Green turtle nesting activity was geolocated during night patrols and the depth of specific nests was measured during two field campaigns in 2021 and 2022. Various original environmental parameters related to vegetation and beach morphology were extracted in a GIS environment based on this geolocated data using orthophotography and digital elevation models (DEMs) created by drones prior to field deployments. Sediment samples were also collected from the beach. Thanks to the combination of fieldwork and GIS analysis, this study makes it possible to examine a set of variables, which until now have rarely been studied simultaneously. The results showed that the Grande Saziley beach is a heterogeneous site with the distribution of egg-laying being concentrated in two hotspots. After principal component and GLMM statistical analysis, it appeared that gravid females preferentially lay in a low proportion of coarse sand at the bottom of the nest, at higher elevation and predominantly in surface sand with a low calcium carbonate content. This preference seems to be linked more to elevation, where black sand is mainly found at the top of the beach, rather than an intentional choice based on sand composition. No significant egg-laying site-related variables were found to explain the variations in nest depth. Our study was based on a new approach combining GIS techniques and drone surveys, enabling the collection of environmental parameters, a methodology Frontiers in Marine Science that can easily be reproduced on other nesting beaches, reducing field workload. However, this work should be continued to assess the viability of sites for clutch survival while considering the spatial and temporal heterogeneity of the environment.

Estuarine lateral ecotones shape taxonomic and functional structure of fish assemblages. The case of the Seine Estuary, France - Pavkovic, Matia; Carpentier, Alexandre; Duhamel, Sylvain; Carassou, Laure; Lobry, Jeremy; Feunteun, Eric; Teichert, Nils (Estuarine, Coastal and Shelf Science, 2025)
Estuaries are complex ecotones including multiple lateral habitats that play essential functions for fish assemblages. However, the distribution of fish diversity and community assembly processes remain poorly documented in these habitats. This paper investigated the taxonomic and functional diversities of fish assemblages along lateral continuums of three salinity areas over the longitudinal gradient of the Seine Estuary. We examined fish diversity at a local scale (⍺-diversity) and between local scales (β-diversity) across the lateral habitats (estuarine main channel, tidal marsh, and diked marsh). Overall, the taxonomic diversity follows a typical ecotone distribution, with the highest richness reported at the system margins and high species dissimilarity between communities. The decrease of functional diversity in upper part of the lateral ecotone probably reflects the homogenisation of ecological niches. Changes in assembly processes between the three salinity conditions suggests that several lateral ecotones occur in estuaries with complementary functions for fish assemblages.

Fibropapillomatosis Dynamics, Severity and Demographic Effect in Caribbean Green Turtles - Lelong, Pierre; Besnard, Aurélien; Girondot, Marc; Habold, Caroline; Priam, Fabienne; Giraudeau, Mathieu; Le Loc’h, Guillaume; Le Loc’h, Aurélie; Fournier, Pascal; Fournier-Chambrillon, Christine; Fort, Jérôme; Bustamante, Paco; et al. (EcoHealth, 2025)

Fish and macro-crustacean assemblages are relevant ecological indicators for monitoring rivers of tropical islands - Teichert, Nils; Lagarde, Raphaël; Faivre, Laëtitia; Valade, Pierre; Grondin, Henri; Labeille, Marion; Keith, Philippe; Feunteun, Eric (Ecological Indicators, 2025)
Understanding how tropical rivers change in response to human-induced disturbances represents a major challenge for management and conservation. However, monitoring networks based on ecological indicators remain scarce in oceanic islands, where freshwater indigenous fish and macro-crustacean assemblages are dominated by diadromous species. We investigated the relevance of these taxa for assessing the ecological status of rivers in two tropical islands, Reunion and Mayotte, Indian Ocean, to fulfill objectives of the European Water Framework Directive in overseas regions. Beyond providing insights on ecological responses of fish and macro-crustacean assemblages, we proposed a methodological framework to designed stressors-specific multimetric index by selecting primarily shared metrics between and within islands to improve the robustness and interpretation of this index. Numerous candidate metrics were tested to reflect the alterations induced by three stressors categories (i.e., continuity alteration, agricultural and urbanisation stresses) on the diversity, abundance, or size-structure of assemblages. Our results demonstrated that fish and macro-crustacean assemblages were sensitive to multiple stressors, but the ecological responses were more congruent when facing continuity alterations, compared to land use changes associated with agriculture or urbanization. These migratory species are understandably vulnerable to river fragmentation, but their oceanic dispersive stage favor exchanges between watersheds, which in turn can promote the resilience and persistence of local populations in degraded areas. In such insular context, we thus suggested using fish and macro-crustaceans to firstly assess the state of ecological continuity, whereas other taxa, such as diatom or macroinvertebrates, can be complementary to reflect the alteration of water quality.

Migratory Connectivity and Non‐Breeding Habitat Segregation Across Biogeographical Scales in Closely Related Seabird Taxa - Morera‐Pujol, Virginia; Catry, Paulo; Magalhães, Maria; Clara Péron; Reyes‐González, José Manuel; Granadeiro, José Pedro; Militão, Teresa; Dias, Maria P.; Oro, Daniel; Igual, José Manuel; Dell'Omo, Giacomo; Müller, Martina; et al. (Diversity and Distributions, 2025)

Molecular evidence of shipping noise impact on the blue mussel, a key species for the sustainability of coastal marine environments - Veillard, D; Beauclercq, S; Ghafari, N; Arnold, AA; Genard, B; Sleno, L; Olivier, F; Choquet, A; Warschawski, DE; Marcotte, I; Tremblay, R (Marine Ecology Progress Series, 2025)
Global anthropogenic oceanic noise caused by shipping is predicted to double every 11.5 yr, putting marine organisms at risk. While the impact of noise on marine mammals is well documented, its effects on molluscs, which hold immense economic and ecological importance, remain largely unknown. To investigate the consequences of noise on mollusc metabolism during crucial early life stages, blue mussel Mytilus edulis larvae were exposed to shipping noise in a laboratory setting until the post-larval stage and their metabolome was analysed. Multivariate analyses of the metabolome showed that shipping noise induced stress-related inflammation with increased energy demand, higher protein turnover, and disrupted nervous system activity. Consequently, noise promoted delayed metamorphosis in suboptimal habitats with greater metabolic costs, which may affect ecosystem and aquaculture sustainability as competent mussel larvae struggle to select suitable development habitats. Without action to limit underwater noise, such impacts could disrupt population structures and marine biodiversity.
Keywords: Metabolism; Metabolomics; Mytilus edulis; noise pollution; Post-larvae

The Scaly Notothen Trematomus loennbergii a new host, and the Ross Sea, Antarctica, a new locality for dermal X‑cell parasites Notoxcellia spp. - Desvignes, Thomas; Clara Péron; Devine, Jennifer; Postlethwait, John H. (Polar Biology, 2025)

A summer in the greater Paris: trophic status of peri-urban lakes shapes prokaryotic community structure and functional potentialAbstract - Foucault, Pierre; Halary, Sébastien; Duval, Charlotte; Goto, Midoli; Marie, Benjamin; Sahima Hamlaoui; Jardillier, Ludwig; Lamy, Dominique; Lance, Emilie; Raimbault, Emmanuelle; Allouti, Fayçal; Troussellier, Marc; et al. (Environmental Microbiome, 2025)

Together throughout the year: seasonal patterns of bacterial and eukaryotic microbial communities in a macrotidal estuary - Hervé, Vincent; Morelle, Jérôme; Lambourdière, Josie; Pascal Jean Lopez; Claquin, Pascal (Environmental Microbiome, 2025)
Background Estuaries are complex ecosystems linking river and marine environments, where microorganisms play a key role in maintaining ecosystem functions. In the present study, we investigated monthly 8 sites at two depth layers and over a one-year period the bacterial and eukaryotic community dynamics along the Seine macrotidal estuary (Normandy, France). To date, the taxonomy of the microbial diversity present in this anthropized estuary remains elusive and the drivers of the microbial community structure are still unknown. Results The metabarcoding analysis of 147 samples revealed both a high bacterial and eukaryotic diversity, dominated by Proteobacteria, Bacteriodota, Actinobacteriota and Bacillariophyta, Spirotrichea, Dinophyceae, respectively. Along the estuary we only detected significant spatial patterns in the bacterial and eukaryotic community compositions for three and two months out of twelve, respectively. However, we found a clear seasonal effect on the diversity of both microbial communities driven by physical and chemical variables that were fluctuating over the year (temperature, irradiance, river flow). Biotic associations were also significant drivers of both alpha and beta diversity. Throughout the year, we identified a diverse and abundant core microbiota composed of 74 bacterial and 41 eukaryotic OTUs. These regionally abundant species include habitat generalists encompassing heterotrophs, phototrophs and consumers. Yet, many of these core OTUs remain taxonomically and functionally poorly assigned. Conclusions This molecular survey represents a milestone in the understanding of macrotidal estuary dynamics and the Seine ecosystem, through the identification of putative markers of ecosystem functioning. It also identifies seasons and biotic associations as main drivers of the Seine estuary microbiota and reveals the importance of a core microbiota throughout the year.

Acclimation capacity of Echinarachnius parma sand dollars enduring a highly seasonal sub-Arctic coastal system - Uboldi, Thomas; Bridier, Guillaume; Frédéric Olivier; Grall, Jacques; Chauvaud, Laurent; Tremblay, Rejean (Marine Ecology Progress Series, 2024)
Marine poikilotherm organisms have evolved several physiological strategies to acclimate to different thermal conditions occurring in coastal environments. This study aimed to describe the acclimation capacity of sand dollars Echinarachnius parma found in the highly seasonal sub-Arctic archipelago of Saint Pierre and Miquelon. Fatty acid composition was quantified in cell membranes and energy reserve of sand dollars collected at specific stations according to depth and seasons. We hypothesized that perceived temperatures, seasonal thermal conditions and the trophic environment may considerably influence E. parma fatty acid profiles. In the polar fraction, E. parma showed high relative contributions of eicosapentaenoic acid (20:5ω3; 28.5%) followed by 16:0 (10.83%), 14:0 (6.67%) and 18:4ω3 (3.49%). Whereas variations in 20:5ω3 relative contributions seemed to be mainly related to spawning events, docosahexaenoic acid (22:6ω3; 2.48%) and arachidonic acid (20:4ω6; 2.49%) varied according to the thermal gradient of the water column. Furthermore, the seasonal thermal internal wave acting throughout the archipelago appeared to lack sufficient intensity to trigger modifications in the polar concentration in individuals. In the neutral fraction, the strong dominance of diatom markers (20:5ω3; 24.2% and 16:1ω7; 21.9%) suggests that the diet of sand dollars mostly reflects the composition of the organic matter available over the sediment. Our study (1) highlights specific fatty acid functions in the metabolic regulation of echinoids, (2) defines the feeding ecology of sand dollars and (3) describes the effects of different thermal conditions on the physiology of locally adapted poikilotherm animals.
Keywords: Echinarachnius; Feeding ecology; Sand dollars; Thermal acclimation

Amphidromous shrimps (Decapoda: Caridea): current knowledge and future research - de Mazancourt, Valentin; Ravaux, Juliette (Journal of Crustacean Biology, 2024)

Ancestors’ Gift: Parental Early Exposure to the Environmentally Realistic Pesticide Mixture Drives Offspring Phenotype in a Larger Extent Than Direct Exposure in the Pacific Oyster, Crassostrea gigas - Sol-Dourdin, Thomas; Guyomard, Killian; Rabiller, Manuella; Houssais, Nina; Cormier, Alexandre; Le Monier, Pauline; Sussarellu, Rossana; Guillaume Rivière (Environmental Science & Technology, 2024)

Approaches and methods to study wildlife cancerAbstract - Giraudeau, Mathieu; Vincze, Orsolya; Dupont, Sophie M.; Sepp, Tuul; Baines, Ciara; Lemaitre, Jean‐Francois; Lemberger, Karin; Gentès, Sophie; Boddy, Amy; Dujon, Antoine M.; Bramwell, Georgina; Harris, Valerie; et al. (Journal of Animal Ecology, 2024)
The last few years have seen a surge of interest from field ecologists and evolutionary biologists to study neoplasia and cancer in wildlife. This contributes to the One Health Approach, which investigates health issues at the intersection of people, wild and domestic animals, together with their changing environments. Nonetheless, the emerging field of wildlife cancer is currently constrained by methodological limitations in detecting cancer using non-invasive sampling. In addition, the suspected differential susceptibility and resistance of species to cancer often make the choice of a unique model species difficult for field biologists. Here, we provide an overview of the importance of pursuing the study of cancer in non-model organisms and we review the currently available methods to detect, measure and quantify cancer in the wild, as well as the methodological limitations to be overcome to develop novel approaches inspired by diagnostic techniques used in human medicine. The methodology we propose here will help understand and hopefully fight this major disease by generating general knowledge about cancer, variation in its rates, tumour-suppressor mechanisms across species as well as its link to life history and physiological characters. Moreover, this is expected to provide key information about cancer in wildlife, which is a top priority due to the accelerated anthropogenic change in the past decades that might favour cancer progression in wild populations.

Automatic identification of the endangered Hawksbill sea turtle behavior using deep learning and cross-species transfer - Jeantet, Lorène; Zondo, Kukhanya; Delvenne, Cyrielle; Martin, Jordan; Chevallier, Damien; Dufourq, Emmanuel (Journal of Experimental Biology, 2024)
The accelerometer, an onboard sensor, enables remote monitoring of animal posture and movement, allowing researchers to deduce behaviors. Despite the automated analysis capabilities provided by deep learning, data scarcity remains a challenge in ecology. We explored transfer learning to classify behaviors from acceleration data of critically endangered hawksbill sea turtles (Eretmochelys imbricata). Transfer learning reuses a model trained on one task from a large dataset to solve a related task. We applied this method using a model trained on green turtles (Chelonia mydas) and adapted it to identify hawksbill behaviors like swimming, resting, and feeding. We also compared this to a model trained on human activity data. Results showed an 8% and 4% F1-score improvement with transfer learning from green turtle and human datasets, respectively. Transfer learning allows researchers to adapt existing models to their study species, leveraging deep learning and expanding the use of accelerometers for wildlife monitoring.

Behavioural heterogeneity across killer whale social units in their response to feeding opportunities from fisheries - Auguin, Erwan; Guinet, Christophe; Mourier, Johann; Clua, Eric; Nicolas Gasco; Tixier, Paul (Ecology and Evolution, 2024)

A benchmark for computational analysis of animal behavior, using animal-borne tags - Hoffman, Benjamin; Cusimano, Maddie; Baglione, Vittorio; Canestrari, Daniela; Chevallier, Damien; DeSantis, Dominic L.; Jeantet, Lorène; Ladds, Monique A.; Maekawa, Takuya; Mata-Silva, Vicente; Moreno-González, Víctor; Pagano, Anthony M.; et al. (Movement Ecology, 2024)
Keywords: Accelerometers; animal behavior; Bio-loggers; Machine Learning; Self-supervised Learning; Time series

Benthic food web structure of a highly stratified sub-Arctic archipelago on the Newfoundland Shelf (Northwest Atlantic Ocean) - Bridier, Guillaume; Frédéric Olivier; Chauvaud, Laurent; Le Garrec, Vincent; Droual, Gabin; Grall, Jacques (Estuarine, Coastal and Shelf Science, 2024)
Arctic and sub-Arctic marine ecosystems are experiencing some of the highest sea surface warming in the world, which has intensified water column stratification and subsequently reduced phytoplankton production and particulate organic matter quality. However, the effects of these changes on benthic food webs and the transfer of organic matter to higher trophic levels are still poorly understood. This study examines the spatial and temporal variability of food web structure in a sub-Arctic benthic community exposed to contrasting thermal stratification conditions. The study hypothesizes that during stratified periods, oceanographic conditions would have a limited effect on benthic invertebrates located above/at the thermocline due to their direct access to surface/subsurface primary production. On the other hand, organisms below the thermocline may be more sensitive to increased stratification because they do not have direct access to these food resources. To test this hypothesis, we sampled benthic invertebrates and several fish species on the Newfoundland Shelf along a cross-shore transect (2 shallow stations versus 2 deep stations above and below the thermocline, respectively) over two seasons. We used isotopic analyses (δ13C and δ15N) to study the structure of the food web and the transfer of organic matter. No temporal variation and little spatial variability in food web structure was observed, resulting in a 73.2% overlap between isotopic niches of shallow and deep stations. At all stations, most primary consumers were characterized by high trophic plasticity, feeding on both phytoplankton and benthic organic matter (mean dependence on benthic sources = 46.7%). In the context of global warming and increased thermal stratification, we hypothesize that benthic primary production may be less vulnerable to nutrient depletion than phytoplankton. We suggest that an increased contribution of benthic primary producers to organic matter fluxes in shallow coastal food webs could significantly enhance the resilience of the benthic food web to stratification intensification.
Keywords: benthic ecosystems; Climate Change; Food web structure; Seasonal stratification; Stable isotopes; Sub-Arctic ecosystems

Comparative transcriptomics reveal a novel tardigrade-specific DNA-binding protein induced in response to ionizing radiation - Anoud, Marwan; Delagoutte, Emmanuelle; Helleu, Quentin; Brion, Alice; Duvernois-Berthet, Evelyne; As, Marie; Marques, Xavier; Lamribet, Khadija; Senamaud-Beaufort, Catherine; Jourdren, Laurent; Adrait, Annie; Heinrich, Sophie; et al. (eLife, 2024)

Complex multivariate model predictions for coral diversity with climatic change - McClanahan, Tim R.; Azali, Maxwell K.; Muthiga, Nyawira A.; Porter, Sean N.; Schleyer, Michael H.; Mireille M M Guillaume (Ecosphere, 2024)

De l’emprise à l’empreinte : cartographier la donnée AIS pour qualifier l’occupation de l’espace maritime caribéen - Le Berre, Iwan; Foulquier, Eric; Le Guyader, Damien; Iphar, Clément; Sahuquet, Manuel; Pascal Jean Lopez (Cybergeo, 2024)

Deciphering environmental forcings in the distribution of meiofauna and nematodes in mangroves of the Atlantic-Caribbean-East Pacific and Indo-West Pacific regions - Spedicato, Adriana; Zeppilli, Daniela; Thouzeau, G; Cuny, Philippe; Militon, Cécile; Sylvi, Léa; Cédric Hubas; Guillaume Dirberg; Jézéquel, Ronan; Barrière, Guerric; Michel, Loïc N.; Bezerra, Tânia Nara; et al. (Science of The Total Environment, 2024)

Demography of endangered juvenile green turtles in face of environmental changes: 10 years of capture-mark-recapture efforts in Martinique - Lelong, Pierre; Besnard, Aurélien; Girondot, Marc; Habold, Caroline; Priam, Fabienne; Giraudeau, Mathieu; Le Loc'h, Guillaume; Le Loc'h, Aurélie; Fournier, Pascal; Fournier-Chambrillon, Christine; Bustamante, Paco; Dupont, Sophie M.; et al. (Biological Conservation, 2024)

Developmental Thermal Reaction Norms of Leatherback Marine Turtles at Nesting Beaches - Girondot, Marc; Caleb J. Krueger; Camille Cléomène; Zeenat Tran; Chevallier, Damien; Fredric J. Janzen (Animals, 2024)
Accurate scientific information is critical for undertaking appropriate conservation and management practices for imperiled species. One source of concern is that research findings might vary for non-biological reasons, including experimental design and analytical methods. To illustrate, we provide detailed modern analysis of reproductive data for leatherback turtles (Dermochelys coriacea). This species exhibits significant fluctuations in nesting densities across different regions, possibly driven by local rather than global factors. Key factors influencing these changes include hatching success and sex determination, both sensitive to incubation temperatures (e.g., lower temperatures yield more males, higher temperatures yield females). This study updates the understanding of temperature-dependent sex determination (TSD) in this species using Bayesian statistics. Growth rate data from the West Pacific and Northwest Atlantic populations show a similar, monotone increase with temperature, affirming the reliability of the models used. The analysis of TSD patterns indicates that observed differences are more likely due to study methodologies and clutch-specific factors rather than regional differences. These findings challenge previous assumptions, showing that leatherback TSD does not conform to a simple on/off pattern but is influenced by multiple, interacting environmental factors. Population dynamics models must account for these complexities, recognizing that both sex ratios and hatching success are critical to understand the rapid changes observed in some leatherback populations.
Keywords: Dermochelys coriacea; embryo; Growth; leatherback; pivotal temperature; Population Dynamics; Sex ratio; temperature-dependent sex determination; transitional range of temperatures; TSD; TSD pattern

Dining on corals: stable isotope evidence for close trophic connection between gall crabs (Cryptochiridae) and their stony coral hosts - Bravo, Henrique; Charlotte R. Dromard; van der Meer, Marcel T. J.; Schleimer, Anna; van der Meij, Sancia E. T. (Symbiosis, 2024)

Diversity and evolution of tyrosinase enzymes involved in the adhesive systems of mussels and tubeworms - Duthoo, Emilie; Delroisse, Jérôme; Maldonado, Barbara; Sinot, Fabien; Mascolo, Cyril; Wattiez, Ruddy; Pascal Jean Lopez; Van de Weerdt, Cécile; Harrington, Matthew J.; Flammang, Patrick (iScience, 2024)

Diversity and spatial variability of shallow benthic macrofaunal assemblages in a high-Arctic fjord (Young Sound, North-East Greenland) - Bridier, Guillaume; Frédéric Olivier; Pinsivy, Lucas; Jourde, Jérôme; Chauvaud, Laurent; Sejr, Mikael K.; Burel, Thomas; Le Duff, Michel; Grall, Jacques (Polar Biology, 2024)
Although knowledge of Arctic benthic biodiversity has increased considerably in recent decades, some regions, such asNortheast Greenland, remain poorly studied. The aim of this study was to complement a previous macrofaunal inventorycarried out in Young Sound, a High-Arctic fjord in this region (74°N). We sampled shallow benthic assemblages along asmall inner/outer fjord gradient, including one station previously prospected two decades ago and three new stations. Thissampling strategy revealed highly diversified benthic assemblages (166 species identified on a total sampling area of 1.32m2), which considerably increases the number of species recorded for the fjord (i.e. 225 species vs 100 previously recorded).The outermost station was dominated in abundance by various assemblages of bivalves, while the middle stations showedgreater species evenness, including numerous species of polychaetes, bivalves and crustaceans. The innermost station wasdominated by ostracods, gammarid amphipods and tube-dwelling polychaetes. Overall, benthic assemblages varied little between the four stations and the transect as a whole exhibited characteristics typical of outer fjord habitats, reflecting the rather moderate impact of meltwater inputs in this part of the fjord. Finally, trophic plasticity and omnivory were observed in most of the recorded macrobenthic species, highlighting the adaptability of these species to low trophic availability in the ecosystem. Future biodiversity studies will need to explore the innermost and deepest areas to provide a more comprehensive inventory and understanding of the influence of environmental conditions on the structure and functioning of Young Sound benthic habitats.
Keywords: Arctic fjord; benthic ecosystems; community structure; Macrofauna; meltwater inputs

eDNA-based survey of the marine vertebrate biodiversity off the west coast of Guadeloupe (French West Indies) - Haderlé, Rachel; Bouveret, Laurent; Chazal, Jordane; Girardet, Justine; Iglésias, Samuel; Pascal Jean Lopez; Millon, Cédric; Valentini, Alice; Ung, Visotheary; Jung, Jean-Luc; Haderlé, Rachel; Bouveret, Laurent; et al. (Biodiversity Data Journal, 2024)

The effect of gonadal hormones on the gene expression of brain-pituitary in protandrous black porgy, Acanthopagrus schlegelii - Tseng, Peng-Wei; Lin, Chien-Ju; Tsao, Yuan-Han; Kuo, Wei-Lun; Chen, Hsin-Chih; Sylvie Dufour; Wu, Guan-Chung; Chang, Ching-Fong (General and Comparative Endocrinology, 2024)

Efficient oxidation attenuates porewater‐derived methane fluxes in mangrove watersAbstract - Yau, Yvonne Y. Y.; Cabral, Alex; Reithmaier, Gloria; Cotovicz, Luiz C.; Barreira, João; Gwenaël Abril; Morana, Cedric; Borges, Alberto V.; Machado, Wilson; Godoy, José M.; Bonaglia, Stefano; Santos, Isaac R. (Limnology and Oceanography, 2024)

Encyclopedia of Reproduction. Photoperiodism in Fish - Falcón, Jack; Muñoz-Cueto, J A (Encyclopedia of Reproduction, 2024)
Fish reproduction is a rhythmic process occurring at particular times of day and year. Photoperiod is the most predictable and powerful environmental synchronizer of reproduction and entrains biological clocks, which allow anticipating the variations of this environment. Temperature is another rhythmic factor used by fish to adjust their metabolic and physiological processes. The pineal organ plays a key role in transducing photoperiod and temperature cycles and controlling the daily and annual reproductive rhythms. We review here how the pineal photoreceptors integrate photo-thermo-periodic information, and produce rhythmic neural and neuroendocrine messengers, including melatonin, which modulate the daily and seasonal production of brain/pituitary/gonad hormones involved in fish reproduction.

Evaluation of a Nanopore Sequencing Strategy on Bacterial Communities From Marine Sediments - Lemoinne, Alice; Dirberg, Guillaume; Georges, Myriam; Robinet, Tony (Environmental DNA, 2024)
Following the development of high-throughput DNA sequencers, environmental prokaryotic communities were usually described by metabarcoding on short markers of the 16S domain. Among third-generation sequencers, that offered the possibility to sequence the full 16S domain, the portable MinION from Oxford Nanopore was undervalued for metabarcoding because of its relatively higher error rate per read. Here we illustrate the limits and benefits of Nanopore sequencing devices by comparing the prokaryotic community structure in a mock community and 52 sediment samples from mangrove sites, inferred from full-length 16S long-reads (16S-FL, ca. 1.5 kbp) on a MinION device, with those inferred from partial 16S short-reads (16S-V4V5, ca. 0.4 kbp, 16S-V4V5) on Illumina MiSeq. 16S-V4V5 and 16S-FL retrieved all the bacterial species from the mock, but Nanopore long-reads overestimated their diversity (56 species vs. 15). Whether these supplementary OTUs were artefactual or not, they only accounted for ca. 10% of the reads. From the sediment samples, with a coverage-based rarefaction of reads and after singletons filtering, Mantel and Procrustean tests of co-inertia showed that bacterial community structures inferred from 16S-V4V5 and 16S-FL were significantly similar, showing both a comparable contrast between sites and a coherent sea-land orientation within sites. In our dataset, 84.7% and 98.8% of the 16S-V4V5 assigned reads were assigned strictly to the same species and genus, respectively, than those detected by 16S-FL. 16S-FL detected 92.2% of the 309 families and 87.7% of the 448 genera that were detected by the short 16S-V4V5. 16S-FL recorded 973 additional species and 392 genus not detected by 16S-V4V5 (31.5% and 10.4% of the 16S-FL reads, respectively, among which 67.8% and 79.3% were assigned), produced by both primer specificities and different error rates. Thus, our results concluded an overall similarity between 16S-V4V5 and 16S-FL sequencing strategies for this type of environmental samples.

Evolutionary genomics of the emergence of brown algae as key components of coastal ecosystems - Denoeud, France; Godfroy, Olivier; Cruaud, Corinne; Heesch, Svenja; Nehr, Zofia; Tadrent, Nachida; Couloux, Arnaud; Brillet-Guéguen, Loraine; Delage, Ludovic; Mckeown, Dean; Motomura, Taizo; Sussfeld, Duncan; et al. (Cell, 2024)
Brown seaweeds are keystone species of coastal ecosystems, often forming extensive underwater forests, and are under considerable threat from climate change. In this study, analysis of multiple genomes has provided insights across the entire evolutionary history of this lineage, from initial emergence, through later diversification of the brown algal orders, down to microevolutionary events at the genus level. Emergence of the brown algal lineage was associated with a marked gain of new orthologous gene families, enhanced protein domain rearrangement, increased horizontal gene transfer events, and the acquisition of novel signaling molecules and key metabolic pathways, the latter notably related to biosynthesis of the alginate-based extracellular matrix, and halogen and phlorotannin biosynthesis. We show that brown algal genome diversification is tightly linked to phenotypic divergence, including changes in life cycle strategy and zoid flagellar structure. The study also showed that integration of large viral genomes has had a significant impact on brown algal genome content throughout the emergence of the lineage.

The expression profiles of cyp19a1, sf-1, esrs and gths in the brain-pituitary during gonadal sex differentiation in juvenile Japanese eels - Jeng, Shan-Ru; Wu, Guan-Chung; Yueh, Wen-Shiun; Liu, Pei-hua; Kuo, Shu-Fen; Sylvie Dufour; Chang, Ching-Fong (General and Comparative Endocrinology, 2024)

Fatty acids and Stable Isotopes distribution in the mangrove dominated Parnaíba River Delta - Chielle, Raisa; Meziane, Tarik; Rezende, Carlos E.; Cotovicz, Luiz C.; Gwenaël Abril; Marins, Rozane V. (Estuarine, Coastal and Shelf Science, 2024)

First Record of Kemp’s Ridley Sea Turtle, Lepidochelys kempii (Garman, 1880), in the Waters of Martinique Island (Lesser Antilles) - Chevallier, Damien; Fretey, Jacques; Lescure, Jean; Girondot, Marc (Animals, 2024)

Freshwater and limno-terrestrial meiofauna of the Massane Forest Reserve in the Eastern French Pyrenees - Majdi, Nabil; Araujo, Thiago Quintao; Bekkouche, Nicolas; Fontaneto, Diego; Garrigue, Joseph; Larrieu, Laurent; Kamburska, Lyudmila; Kieneke, Alexander; Minowa, Axell Kou; Laumer, Christopher; Sabatino, Raffaella; Sorel, Diane; et al. (Biogeographia – The Journal of Integrative Biogeography, 2024)

Future research avenues for the study of fibropapillomatosis in sea turtles - Dupont, Sophie M.; Bustamante, Paco; Duffy, David J.; Fort, Jérôme; Le Loc’h, Guillaume; Lelong, Pierre; Chevallier, Damien; Giraudeau, Mathieu (Frontiers in Ecology and Evolution, 2024)
Fibropapillomatosis (FP) is a debilitating tumoral disease affecting sea turtles worldwide. While mainly afflicting immature individuals and potentially altering vital functions, the precise impact of this panzootic on turtle health and survival remains unclear. Moreover, the etiological factors implicated in the FP emergence, development and transmission are not yet definitively identified. Among them, an infection by a spreading herpesvirus and the contamination by pollutants (either organic pollutants and trace elements) are suspected. Here, we provide an overview of discoveries, knowledge and propose hypotheses related to FP within five key FP research areas, i.e., virology studies, transmission studies, contamination studies, host genomic studies, and veterinary treatment assays. Moreover, we recommend urgent research avenues to develop at the interface of virology, epidemiology, ecotoxicology, oncology, physiology, immunology, cellular and evolutionary biology, in order to characterize the dynamics of FP and to predict its consequences on sea turtle populations. Importantly, extending the implementation and development of strong collaborations between rehabilitation centers, field biologists and research laboratories at large geographical scale is required to rapidly increase our knowledge on FP and work towards its effective management.
Keywords: Conservation; fibropapillomatosis; host genomics; pollution; sea turtle; veterinary medicine; viral agent

Generating pseudo-absences in the ecological space improves the biological relevance of response curves in species distribution models - Broussin, Joséphine; Mouchet, Maud; Goberville, Eric (Ecological Modelling, 2024)
Species distribution modeling (SDM) is widely used to predict past and future species distributions. However, absence data for species can be scarce or even nonexistent, necessitating the generation of pseudo-absences (PA). Traditionally, PA are generated based on geographic locations where the species is not observed, but this method can introduce biases related to environmental heterogeneity across geographic areas. To address these limitations, recent methods have shifted towards generating PA in ecological space rather than solely in geographic space. Here, we introduce a methodological framework that strengthens the integration of ecological principles into the generation of PA. Our approach constructs an n-dimensional array, with each dimension representing an environmental predictor, and fills this array based on the density of species presences. By subtracting the presence density from the maximum density, we construct a 'reverse niche' from which PA are generated. We tested and validated our method by successfully reconstructing the response curves of a virtual species, demonstrating the potential of ecologically-based PA to better capture spatial patterns and enhance SDM accuracy. This method is available in an open-access, user-friendly R package, named EcoPA intended to serve as a valuable tool for researchers working with species distribution modeling in ecology, conservation, and related fields.

Genetic variability of New Caledonian Boeckella de Guerne & Richard, 1889 (Copepoda: Calanoida), with the description of a new species - Royaux, Coline; Charpin, Nicolas; Nicolas Rabet (Journal of Crustacean Biology, 2024)
Thirteen new freshwater populations of the copepod genus Boeckella De Guerne & Richard, 1889 were found during three expeditions to New Caledonia ( La Planete Revisitee, 2016-2018). The 12 populations from the Plaine des Lacs, which show remarkable genetic diversity among themselves, were identified as B. spinogibba Defaye, 1998, the only species of its genus known from New Caledonia until now. The sole exception, the population from Mont-Dore 22 km further east, appeared genetically and morphologically distinct from the others and is described herein as a new species. The two species are distinguished from each other by the shapes of the male and female P5, female Th5, and body colour. A previously published key is amended to separate the species. Our concatenated COI+28S phylogeny places the two New Caledonia species as a new branch within Boeckella, distinct from the branches consisting of South American, Antarctic and Australasian species. All 13 Boeckella populations inhabit the extreme south of New Caledonia, an area known for endemism and high heavy metal concentrations in the soil. Extensive mining activity in this metal-rich area, begun in 1873, is now leading to conflict with conservation goals. By using aerial photographs to trace the fate of the pond that is the type locality of B. spinogibba, we confirmed that it disappeared between 2007 and 2014 as a result of the expansion of the Goro nickel mine.
Keywords: Boeckella spinogibba; Conservation; Crustacea; freshwater zooplankton; micro-endemism; mining perturbation; morphology; Phylogeny; population genetics

A global database of dissolved organic matter (DOM) concentration measurements in coastal waters (CoastDOM v1) - Lønborg, Christian; Carreira, Cátia; Gwenaël Abril; Agustí, Susana; Amaral, Valentina; Andersson, Agneta; Arístegui, Javier; Bhadury, Punyasloke; Bif, Mariana B.; Borges, Alberto V.; Bouillon, Steven; Calleja, Maria Ll.; et al. (Earth System Science Data, 2024)

Hormones and Reproduction of Vertebrates, Volume 1, chapitre 9, The pineal and reproduction of teleosts and other fishes - Falcón, Jack; Muñoz-Cueto, José Antonio (Hormones and Reproduction of Vertebrates, 2024)

Hydro-morphological features and functional structure of fish assemblages mediate species isotopic niches in estuaries - Teichert, Nils; Lizé, Anne; Lepage, Mario; Cabral, Henrique; Trancart, Thomas; Acou, Anthony; Larregieu, Marie; Feunteun, Eric; Carpentier, Alexandre (Estuarine, Coastal and Shelf Science, 2024)
Despite the popularity of stable isotope analysis (Carbon and Nitrogen), the drivers of species isotopic niches and their consequences on food web functioning remained poorly described, especially in estuaries. Here, we hypothesised that species niche characteristics are influenced by ecosystem hydro-morphological features and the functional structure of fish assemblages. The trophic niches of four fish species (Dicentrarchus labrax, Pomatoschistus minutus, Sprattus and Platichthys flesus) and overlap between them were compared during two consecutive autumns in eight estuarine ecosystems of the northeast Atlantic Ocean. Our findings demonstrated a relative steadiness of trophic positions of fish in estuaries, despite a high level of interspecific variability. The seabass generally occupied the higher trophic position, followed by the sand goby, while the flounder and sprat were at the lowest position in the food web. Species isotopic niches and overlap were mediated by some estuarine features, including estuary size and intertidal extent, but also by biotic interactions at the intra- and inter-specific levels, as reflected by the influence of fish abundance and functional diversity metrics. Our results support the statement that the intertidal area is a pivotal factor in regulating trophic interactions, by promoting niche partitioning and diversification of trophic resources between species. Moreover, niche size and dietary divergence of species decreased with increasing regularity of trophic strategies within assemblages, suggesting that species occupied more restricted trophic niches when they were less subjected to competition for the same food resources. These findings emphasize the importance of local conditions and the functional composition of assemblages in modulating the trophic resources consumed by fish in estuarine environments.
Keywords: Estuary; functional diversity; Isotopic niche; stable isotope; Trophic competition

The identity of the iconic Japanese ‘Heike-gani’, Heikeopsis japonica (von Siebold, 1824) (Crustacea, Decapoda, Brachyura, Dorippidae) - Guinot, Danièle; Ng, Peter K L; Naruse, Tohru; de Mazancourt, Valentin (Zoosystema, 2024)
In the Dorippidae H. Milne Edwards, 1837, as revised by Holthuis & Manning (1990), ambulatory leg length, which is often utilised as a criterion for specific morphological differentiation, has proved to be a reliable character, even for the few cases where sexual dimorphism is observed in relative lengths. However, the discrepancies in the use of ambulatory leg length by these authors in the case of the iconic East Asian crab Heikeopsis japonica (von Siebold, 1824) is an issue that requires detailed study. The use of ambulatory leg length in dorippids has since been followed up by other researchers, but it is clear that there is a problem with this species. The taxonomy of the Heike-gani crab is therefore examined here in depth. In their revision, Holthuis & Manning (1990) did not discuss or resolve the problem that in H. japonica the first and second ambulatory legs are constantly and consistently long and narrow in adults of both sexes for most specimens in Japan, Taiwan and southern China, whereas the populations from the North China Sea have legs that are usually distinctly shorter and wider. Holthuis & Man- ning (1990) synonymised the long-legged Neodorippe (Neodorippe) japonica var. taiwanensis Serène & Romimohtarto, 1969 with Heikea japonica (von Siebold, 1824) but, in addition, recognised a new very long-legged species from the Inland Sea in Japan, H. arachnoides (Manning & Holthuis, 1986). While the first and second ambulatory legs of H. arachnoides are relatively longer than in the typical H. japonica from the other parts of Japan, the difference is slight, and the holotype is not a fully adult specimen. Much of the literature on H. japonica from Japan, China, Hong Kong, Taiwan, and Korea does not discriminate between the leg lengths, and most authors follow the prognosis of Holthuis & Manning (1990) for the taxonomy. To better understand the problem with leg lengths in H. japonica, we examined a large series of specimens of these different leg-morphs from across its distribution, including the types of the various taxa. We confirm here that Neodorippe (Neodorippe) japonica var. taiwanensis is a junior synonym of H. japonica s. str. We also show that Heikea arachnoides Manning & Holthuis, 1986, based on not fully-grown individuals, is clearly a junior synonym of H. japonica s. str. as we demonstrate here that subadults and juveniles usually have proportionately longer and more slender first and second ambulatory legs. Notably, while all adult specimens from northern Chinese waters have shorter legs in contrast to those from other areas, this character is not unique to them: there were some specimens from Japan, Taiwan and southern China that possess relatively shorter legs as well, and others that belonged to the typical long-legged morph. Detailed morphological examination (including gonopods) of hundreds of specimens and analysis of sequence data for the mitochondrial 16S rRNA gene did not reveal any significant characters that could be used to separate the two morphs. This may be one of the very first cases of incipient speciation or cladogenesis taking place in a widely distributed species, with the northern Chinese population beginning to be isolated, but not long enough for other morphological and/or genetic characters to manifest themselves.
Keywords: 16S rRNA; ambulatory leg length; East Asia; Heikea arachnoides; incipient speciation; long-legged morph; molecular analysis; Morphological variability; Neodorippe (Neodorippe) japonica var. taiwanensis; short-legged morph

Impact of environmental conditions on English Channel long-finned squid (Loligo spp.) recruitment strength and spatial location - Marcout, Anna; Foucher, Eric; Pierce, Graham J.; Robin, Jean-Paul (Frontiers in Marine Science, 2024)

Influence of strains in development of francisellosis in the blue mussel Mytilus edulis during experimental challenges - Bouras, Hélène; Quesnelle, Yann; Trancart, Suzanne; Blin, Jean-Louis; Savary, Manuel; Zatylny-Gaudin, Céline; Houssin, Maryline (Aquaculture Reports, 2024)

Insights into the water microbiome dynamics of a large tropical estuary transition - Oliveira, Odara Araujo de; Estrada, Carolina Salvador Duque; Vidal, Luciana de Oliveira; Junior, Luiz Carlos Cotovicz; Gwenaël Abril; Rezende, Carlos Eduardo de; Thompson, Cristiane Carneiro; Thompson, Fabiano Lopes; Tschoeke, Diogo Antônio; Garcia, Gizele Duarte (Science of The Total Environment, 2024)

An integrative taxonomic revision of the freshwater atyid shrimps (Crustacea: Decapoda: Caridea) of Micronesia - de Mazancourt, Valentin; Marquet, Gérard; Keith, Philippe (Diversity, 2024)
Twelve species of atyid shrimps are reported from three Micronesian islands (Babeldaob, Pohnpei, and Guam) and studied using a combined morphological and molecular approach. Among them, three are new records for the area (Caridina appendiculata, Caridina lobocensis, and Caridina rubella), while three new species are here described: Atyoida chacei sp. nov., Caridina ponapensis sp. nov., and Caridina rintelenorum sp. nov. Descriptions for these new species, diagnoses for poorly known species, and taxonomic notes are provided herein and their biogeography is discussed.
Keywords: 16S; amphidromy; Atyidae; DNA; island; morphology

Integrative taxonomy study of brackish water crabs of the genus Ptychognathus Stimpson, 1858 (Crustacea: Brachyura: Varunidae) from Polynesia, with description of two new species - de Mazancourt, Valentin; Mazel, Virgile; Marquet, Gérard; Poupin, Joseph; Keith, Philippe (Zootaxa, 2024)
In the present contribution, five species of Ptychognathus Stimpson, 1858 are reported from Polynesia: P. crassimanus Finnegan, 1931, P. easteranus Rathbun, 1907, P. riedelii (A. Milne-Edwards, 1868) and two new species. The first new species named P. ngankeeae sp. nov. is close to P. barbatus (A. Milne-Edwards, 1873) from New Caledonia, which is here redescribed for comparison purposes. The second new species named P. similis sp. nov. is close to P. hachijoensis Sakai, 1955.

Intraspecific genetic lineages of a marine mussel show behavioural divergence when exposed to microplastic leachates - Lorenzo Cozzolino; Nicastro, Katy R.; Hubbard, P C; Seuront, Laurent; Christopher D. McQuaid; Zardi, Gerardo I. (Environmental Pollution, 2024)

Macrobrachium ngankeeae, a new species of freshwater shrimp (Crustacea: Decapoda: Palaemonidae) from Papua Barat Province, Indonesia - de Mazancourt, Valentin; Marquet, Gérard; Wowor, Daisy; Keith, Philippe (Zootaxa, 2024)
A new freshwater prawn, Macrobrachium ngankeeae n. sp., is described from two rivers in the Kaimana Regency on the southern coast of Papua Barat Province, Indonesia. The new species belongs to the Macrobrachium placidulum species- group, but it can be easily distinguished from the other members of this group by having fewer postorbital teeth and the epigastric tooth placed more anteriorly with a relatively shorter epigastric length, i.e. 0.23–0.27 of carapace length (vs 0.24–0.55 in the other species members). Other distinguishing morphological characters and a molecular analysis of this new species are discussed. A key to the species of the M. placidulum species-group is also provided.

Mathematical lipid correction of δ 13 C and effect of lipid extraction on δ 15 N of European eel (AbstractRationaleMethodsResultsConclusions - Lagarde, Raphaël; Menniti, Christophe; Teichert, Nils; Amilhat, Elsa; Faliex, Elisabeth; Nahon, Sarah (Rapid Communications in Mass Spectrometry, 2024)
Rationale Carbon (δ ¹³ C) and nitrogen (δ ¹⁵ N) stable isotope analysis is a powerful tool to investigate diverse questions in fish ecology, such as their trophic position or migration strategies. These questions appear particularly important to protect endangered European eel. However, elevated lipid content in eel muscle can bias δ ¹³ C values, as lipids are ¹³ C‐depleted compared to proteins and carbohydrates. Methods We measured δ ¹³ C and δ ¹⁵ N values of bulk and lipid‐free samples of eel muscle. Lipid‐free samples were obtained after the extraction of lipids with cyclohexane. Lipid‐corrected δ ¹³ C values, using five different mathematical equations based on bulk δ ¹³ C values, were compared to lipid‐free δ ¹³ C values. We also evaluated the effect of lipid extraction on δ ¹⁵ N values. The analyses were based on linear regression performed on 333 individuals captured in nine lagoons and four rivers. Results Independently to the capture site or habitat (river or lagoon), the predicted lipid‐corrected δ ¹³ C values were highly consistent with the measured lipid‐free δ ¹³ C values ( R ² > 0.90). The application of specific equations for each habitat or capture site only slightly increases these R ² (1.5% or less). The lipid extraction treatment significantly decreased by 0.2‰ the δ ¹⁵ N values compared to bulk samples. Conclusions Given the excellent prediction of mathematical equations and the small decrease of δ ¹⁵ N values after lipids extraction, we propose to use mathematical correction to estimate δ ¹³ C values of eel muscle. As the habitats or sites did not strongly influence the results, the coefficients from our study can be applied to other studies on European eel.

The metabolites of light: Untargeted metabolomic approaches bring new clues to understand light-driven acclimation of intertidal mudflat biofilm - Caroline Doose; Cédric Hubas (Science of The Total Environment, 2024)
The microphytobenthos (MPB), a microbial community of primary producers, play a key role in coastal ecosystem functioning, particularly in intertidal mudflats. These mudflats experience challenging variations of irradiance, forcing the micro-organisms to develop photoprotective mechanisms to survive and thrive in this dynamic environment. Two major adaptations to light are well described in literature: the excess of light energy dissipation through non-photochemical quenching (NPQ), and the vertical migration in the sediment. These mechanisms trigger considerable scientific interest, but the biological processes and metabolic mechanisms involved in light-driven vertical migration remain largely unknown. To our knowledge, this study investigates for the first time metabolomic responses of a migrational mudflat biofilm exposed for 30 min to a light gradient of photosynthetically active radiation (PAR) from 50 to 1000 μmol photons m−2 s−1. The untargeted metabolomic analysis allowed to identify metabolites involved in two types of responses to light irradiance levels. On the one hand, the production of SFAs and MUFAs, primarily derived from bacteria, indicates a healthy photosynthetic state of MPB under low light (LL; 50 and 100 PAR) and medium light (ML; 250 PAR) conditions. Conversely, when exposed to high light (HL; 500, 750 and 1000 PAR), the MPB experienced light-induced stress, triggering the production of alka(e)nes and fatty alcohols. The physiological and ecological roles of these compounds are poorly described in literature. This study sheds new light on the topic, as it suggests that these compounds may play a crucial and previously unexplored role in light-induced stress acclimation of migrational MPB biofilms. Since alka(e)nes are produced from FAs decarboxylation, these results thus emphasize for the first time the importance of FAs pathways in microphytobenthic biofilms acclimation to light.

Methane oxidation minimizes emissions and offsets to carbon burial in mangroves - Cotovicz, Luiz C.; Gwenaël Abril; Sanders, Christian J.; Tait, Douglas R.; Maher, Damien T.; Sippo, James Z.; Holloway, Ceylena; Yau, Yvonne Y. Y.; Santos, Isaac R. (Nature Climate Change, 2024)

Mycorrhizal communities of Vanilla planifolia in an introduction area (La Réunion) under varying cultivation practices - Petrolli, Rémi; Selosse, Marc‐André; Céline Bonillo; Griveau, Chantal; Lalanne‐Tisné, Guillaume; Comes, Bertrand; Kodja, Hippolyte; Martos, Florent (Plants, People, Planet, 2024)
Vanilla is one of the most valuable spices in the world. In Madagascar and La Réunion, the world's leading producers, vanilla is of great economic and cultural importance. Like all orchids, vanilla plants associate with mycorrhizal fungi in their roots forming mutualistic associations that allow them to grow and thrive. Understanding the diversity of mycorrhizal fungi adapted to vanilla cultivation, particularly in the Indian Ocean islands where they have never previously been studied, is becoming a necessity for maintaining vanilla crops in these regions in the face of climate change and the emergence of new pathogens.

A niche‐based theory of island biogeography - Grégory Beaugrand; Kléparski, Loïck; Christophe Luczak; Goberville, Eric; Richard R Kirby (Ecology and Evolution, 2024)
The equilibrium theory of island biogeography (ETIB) is a widely applied dynamic theory proposed in the 1960s to explain why islands have coherent differences in species richness. The development of the ETIB was temporarily challenged in the 1970s by the alternative static theory of ecological impoverishment (TEI). The TEI suggests that the number of species on an island is determined by its number of habitats or niches but, with no clear evidence relating species richness to the number of niches however, the TEI has been almost dismissed as a theory in favour of the original ETIB. Here, we show that the number of climatic niches on islands is an important predictor of the species richness of plants, herpetofauna and land birds. We therefore propose a model called the niche-based theory of island biogeography (NTIB), based on the MacroEcological Theory on the Arrangement of Life (METAL), which successfully integrates the number of niches sensu Hutchinson into ETIB. To account for greater species turnover at the beginning of colonisation, we include higher initial extinction rates. When we test our NTIB for resident land birds in the Krakatau Islands, it reveals a good correspondence with observed species richness, immigration and extinction rates. Provided the environmental regime remains unchanged, we estimate that the current species richness at equilibrium is ~45 species (range between 38.39 and 61.51). Our NTIB provides better prediction because it counts for changes in species richness with latitude, which is not considered in any theory of island biogeography.

Noise pollution causes parental stress on marine invertebrates, the Giant scallop example - Gigot, Mathilde; Tremblay, Rejean; Bonnel, Julien; Mathias, Delphine; Meziane, Tarik; Chauvaud, Laurent; Frédéric Olivier (Marine Pollution Bulletin, 2024)
In marine invertebrates, abiotic stresses on adults can act directly on gametes quality, which impacts phenotype and development success of the offspring. Human activities introduce noise pollution in the marine environment but still few studies on invertebrates have considered the impacts on adult or larval stages separately, and to our knowledge, never investigated the cross-generational effects of anthropogenic noise. This article explores parental effects of pile driving noise associated with the building phase of offshore wind turbines on a coastal invertebrate, Pecten maximus (L.). Adults were exposed to increasing levels of sound during gametogenesis, then their offspring were also exposed. The results highlight that anthropogenic noise experienced by the parents reduces their reproductive investment and modify larval response in similar conditions. Also, larvae from exposed adults grew 6-fold faster and metamorphosed 5-fold faster, which could be an amplified adaptive strategy to reduce the pelagic phase in a stressful environment.
Keywords: Anthropophony; Larvae recruitment; Parental effects; Pile driving

Northeast Atlantic elasmobranch community on the move: Functional reorganization in response to climate change - Coulon, Noémie; Elliott, Sophie; Teichert, Nils; Auber, Arnaud; McLean, Matthew; Barreau, Thomas; Feunteun, Eric; Carpentier, Alexandre (Global Change Biology, 2024)
While spatial distribution shifts have been documented in many marine fishes under global change, the responses of elasmobranchs have rarely been studied, which may have led to an underestimation of their potential additional threats. Given their irreplaceable role in ecosystems and their high extinction risk, we used a 24-year time series (1997–2020) of scientific bottom trawl surveys to examine the effects of climate change on the spatial distribution of nine elasmobranch species within Northeast Atlantic waters. Using a hierarchical modeling of species communities, belonging to the joint species distribution models, we found that suitable habitats for four species increased on average by a factor of 1.6 and, for six species, shifted north-eastwards and/or to deeper waters over the past two decades. By integrating species traits, we showed changes in habitat suitability led to changes in the elasmobranchs trait composition. Moreover, communities shifted to deeper waters and their mean trophic level decreased. We also note an increase in the mean community size at maturity concurrent with a decrease in fecundity. Because skates and sharks are functionally unique and dangerously vulnerable to both climate change and fishing, we advocate for urgent considerations of species traits in management measures. Their use would make it better to identify species whose loss could have irreversible impacts in face of the myriad of anthropogenic threats.

Opportunities for Earth Observation to Inform Risk Management for Ocean Tipping Points - Wood, Richard A.; Baker, Jonathan A.; Grégory Beaugrand; Boutin, Jacqueline; Alessandra Conversi; Donner, Reik V.; Frenger, Ivy; Goberville, Eric; Hayashida, Hakase; Koeve, Wolfgang; Kvale, Karin; Landolfi, Angela; et al. (Surveys in Geophysics, 2024)
As climate change continues, the likelihood of passing critical thresholds or tipping points increases. Hence, there is a need to advance the science for detecting such thresholds. In this paper, we assess the needs and opportunities for Earth Observation (EO, here understood to refer to satellite observations) to inform society in responding to the risks associated with ten potential large-scale ocean tipping elements: Atlantic Meridional Overturning Circulation; Atlantic Subpolar Gyre; Beaufort Gyre; Arctic halocline; Kuroshio Large Meander; deoxygenation; phytoplankton; zooplankton; higher level ecosystems (including fisheries); and marine biodiversity. We review current scientific understanding and identify specific EO and related modelling needs for each of these tipping elements. We draw out some generic points that apply across several of the elements. These common points include the importance of maintaining long-term, consistent time series; the need to combine EO data consistently with in situ data types (including subsurface), for example through data assimilation; and the need to reduce or work with current mismatches in resolution (in both directions) between climate models and EO datasets. Our analysis shows that developing EO, modelling and prediction systems together, with understanding of the strengths and limitations of each, provides many promising paths towards monitoring and early warning systems for tipping, and towards the development of the next generation of climate models.

Phosphate buffering in mangrove sediment pore water under eutrophication and deforestation influences - Nascimento-Silva, Grazielle; Oliveira, Gabriela B.; Matos, Christiene R.L.; Metzger, Edouard; Sanders, Christian J.; Marotta, Humberto; Díaz, Rut; Gwenaël Abril; Machado, Wilson (Marine Pollution Bulletin, 2024)

Phytoplankton Diversity Across a Coastal Urbanization and Eutrophication Gradient: The Sepetiba Bay—Ilha Grande Bay Continuum in Rio de Janeiro - Miranda, F. A. V.; Moser, G. A. O.; Lima, D. T.; Machado, W. T. V.; Brandini, N.; Fernandes, A. M.; Costa, L. V. M.; Amaral, M. F.; Oliveira, G. B.; Gwenaël Abril (Marine Ecology, 2024)

Population dynamics and spatial structure of the grey rockcod (Lepidonotothen squamifrons) in the vicinity of Heard Island and the McDonald Islands - Maschette, Dale; Burch, Paul; Farmer, Bryn; Woodcock, Emma; Clara Péron; Cramer, Breanna; Gardner, Caleb; Welsford, Dirk C. (PLOS ONE, 2024)
The grey rockcod, Lepidonotothen squamifrons is an important prey species for seals, penguins and Patagonian toothfish (Dissostichus eleginoides) in the Southern Ocean. Across the Kerguelen Plateau, the species was fished to commercial extinction (ca. 152 000 tonnes between 1971 and 1978) prior to the declaration of the French Exclusive Economic Zone in 1979 and the Australian Fishing Zone in 1981. In this study we estimate; age, growth, maturity, sex ratio, body condition (weight-at-length), and population density of grey rockcod using data from 19 trawl surveys from 1990 to 2014. There appeared to be three distinct geographical populations, with differences in biological parameters within each population. This study has identified separate metapopulations within the southern region of the Kerguelen Plateau and we recommend that management should take into account the different characteristics of these populations, and that this meta-population structure may be a factor in why this species required several decades to show signs of recovery.

Post-release survival of Whiteleg skate (Amblyraja taaf) caught as bycatch on demersal longlines in deep waters of the Southern Ocean (Crozet Archipelago) - Faure, Johanna; Authier, Matthieu; Massiot-Granier, Félix; Plard, Floriane; Clara Péron (ICES Journal of Marine Science, 2024)

Predictors of long-term variability in NE Atlantic plankton communities - Holland, Matthew M.; Atkinson, Angus; Best, Mike; Bresnan, Eileen; Devlin, Michelle; Goberville, Eric; Hélaouët, Pierre; Machairopoulou, Margarita; Faith, Matthew; Thompson, Murray S.A.; McQuatters-Gollop, Abigail (Science of The Total Environment, 2024)
Anthropogenic pressures such as climate change and nutrient pollution are causing rapid changes in the marine environment. The relative influence of drivers of change on the plankton community remains uncertain, and this uncertainty is limiting our understanding of sustainable levels of human pressures. Plankton are the primary energy resource in marine food webs and respond rapidly to environmental changes, representing useful indicators of shifts in ecosystem structure and function. Categorising plankton into broad groups with similar characteristics, known as “lifeforms”, can be useful for understanding ecological patterns related to environmental change and for assessing the state of pelagic habitats in accordance with the EU Marine Strategy Framework Directive and the OSPAR Commission, which mandates protection of the North-East Atlantic. We analysed 29 years of Continuous Plankton Recorder data (1993–2021) from the North-East Atlantic to examine how trends in plankton lifeform abundance changed in relation to one another and across gradients of environmental change associated with human pressures. Random forest models predicted between 57 % and 80 % of the variability in lifeform abundance, based on data not used to train the models. Observed variability was mainly explained by trends in other lifeforms, with mainly positively correlated trends, indicating bottom-up control and/or shared responses to environmental variability were prevalent. Longitude, bathymetry, mixed layer depth, the nitrogen-to‑phosphorus ratio, and temperature were also significant predictors. However, contrasting influences of environmental drivers were detected. For example, small copepod abundance increased in warmer conditions whereas meroplankton, large copepods and fish larvae either decreased or were unchanged. Our findings highlight recent changes in stratification, reflected by variation in mixed layer depth, and imbalanced nutrient ratios are affecting multiple lifeforms, impacting the North-East Atlantic plankton community. To achieve environmental improvements in North-East Atlantic pelagic habitats, it is crucial that we continue to address climate change and reduce nutrient pollution.

Quantifying larval dispersal portfolio in seabass nurseries using otolith chemical signatures - Teichert, Nils; Tabouret, Hélène; Lizé, Anne; Daverat, Françoise; Acou, Anthony; Trancart, Thomas; Virag, Laure-Sarah; Pecheyran, Christophe; Feunteun, Eric; Carpentier, Alexandre (Marine Environmental Research, 2024)
The temporal asynchronies in larvae production from different spawning areas are fundamental components for ensuring stability and resilience of marine metapopulations. Such a concept, named portfolio effect, supposes that diversifying larval dispersal histories should minimize the risk of recruitment failure by increasing the probability that at least some larvae successfully settle in nursery. Here, we used a reconstructive approach based on otolith chemistry to quantify the larval dispersal portfolio of the European seabass, Dicentrarchus labrax, across six estuarine nursery areas of the northeast Atlantic Ocean. The analysis of natal and trajectory signatures indicated that larvae hatch in distinct environments and then dispersed in water masses featured by contrasting chemical signatures. While some trace elements appeared affected by temporal changes (Mn and Sr), others varied spatially during the larval stage but remained poorly affected by temporal fluctuation and fish physiology (Ba, Cu, Rb and Zn). We then proposed two diversity metrics based on richness and variations of chemical signatures among populations to reflect spatio-temporal diversity in natal origins and larval trajectories (i.e., estimates of dispersal portfolio). Along the French coast, the diversity estimates were maximum in nurseries located at proximity of offshore spawning sites and featured by complex offshore hydrodynamic contexts, such as the Mont St-Michel bay. Finally, our findings indicate that the dispersal portfolio was positively related with the local abundance of seabass juveniles, supporting the assumption that heterogeneity in dispersal history contributes to promote recruitment success in nurseries.
Keywords: Connectivity; dispersion; Dynamic time warping; Fish nursery; Larval life history; Otolith chemistry

The response of sea turtles to vocalizations opens new perspectives to reduce their bycatch - Chevallier, Damien; Maucourt, Léo; Charrier, Isabelle; Lelong, Pierre; Le Gall, Yves; Menut, Eric; Wallace, Bryan; Delvenne, Cyrielle; Vincze, Orsolya; Jeantet, Lorène; Girondot, Marc; Martin, Jordan; et al. (Scientific reports, 2024)
Incidental capture of non-target species poses a pervasive threat to many marine species, with sometimes devastating consequences for both fisheries and conservation efforts. Because of the well-known importance of vocalizations in cetaceans, acoustic deterrents have been extensively used for these species. In contrast, acoustic communication for sea turtles has been considered negligible, and this question has been largely unexplored. Addressing this challenge therefore requires a comprehensive understanding of sea turtles’ responses to sensory signals. In this study, we scrutinized the avenue of auditory cues, specifically the natural sounds produced by green turtles (Chelonia mydas) in Martinique, as a potential tool to reduce bycatch. We recorded 10 sounds produced by green turtles and identified those that appear to correspond to alerts, flight or social contact between individuals. Subsequently, these turtle sounds—as well synthetic and natural (earthquake) sounds—were presented to turtles in known foraging areas to assess the behavioral response of green turtles to these sounds. Our data highlighted that the playback of sounds produced by sea turtles was associated with alert or increased the vigilance of individuals. This therefore suggests novel opportunities for using sea turtle sounds to deter them from fishing gear or other potentially harmful areas, and highlights the potential of our research to improve sea turtles populations’ conservation.
Keywords: Acoustic; Bycatch; Conservation; Sea turtles; Vocalizations

Revision of Dugastella nitida n. comb. (Crustacea: Decapoda: Atyidae), a freshwater shrimp from the Oligocene of Aix-en-Provence - de Mazancourt, Valentin; Audo, Denis (Geodiversitas, 2024)
The fossil shrimp species Caridina nitida A. Milne-Edwards, 1879 described from the Oligocene la- custrine deposits of Aix-en-Provence was considered to be a nomen dubium. Based on newly discovered specimens at the type locality, we provide an illustrated re-description of this species. The detailed morphological study leads us to place C. nitida within the extant genus Dugastella Bouvier, 1912. These new data support the hypothesis of a fresh to slightly brackish palaeoenvironment. A specimen possibly corresponding to A. Milne-Edward’s holotype was found in the collections of the Muséum national d’Histoire naturelle but since the fossil shrimp is not visible anymore (destroyed), a neotype is designated among the new specimens.
Keywords: Atyidae; Caridea; Decapoda; lacustrine; Lagerstätte; neotypification; new combination; palaeoenvironment

Sargassum beaching on mangrove sediments shifts microbial and crab metabolisms and enhances blue carbon storage - Chynel, Mathias; Gwenaël Abril; Narayaninsamy, Mélissa; Deirmendjian, Loris; Guérin, Frédéric; Dromard, Charlotte; Meziane, Tarik (Limnology and Oceanography, 2024)

Settlement patterns and temporal successions of coral reef cryptic communities affect diversity assessments using autonomous reef monitoring structures (ARMS). - Couëdel, Marion; Dettai, Agnès; Guillaume, Mireille M M; Bonillo, Céline; Frattini, Baptiste; Bruggemann, J Henrich (Sci Rep, 2024)
Autonomous Reef Monitoring Structures (ARMS) are used worldwide to assess cryptic diversity, especially on coral reefs. They were developed as standardised tools, yet conditions of deployment, such as immersion duration and/or deployment and retrieval seasons, vary among studies. Here we studied temporal and seasonal variability in coral reef cryptic communities sampled with 15 ARMS on a single coral reef slope site at Reunion Island, Southwest Indian Ocean. Settlement patterns and temporal succession of Eukaryote communities were investigated across three immersion times (6 months, 1 year, 2 years), two immersion seasons (hot vs. cool) and three fractions (500-2000 μm, 106-500 μm, sessile) using two genetic markers (18S, COI). Both markers detected different taxa with different resolutions, but broadly similar patterns of community composition and structure. While OTU diversity of communities did not change with immersion time and season, these parameters significantly affected community structure and composition. Our results showed a decrease of the similarity of ARMS communities with duration of immersion, and a strong temporal turnover of species with only a small proportion of the diversity persisting over time. The small proportion of OTUs assigned at phylum level highlights the uniqueness of the Mascarene cryptobiome.
Keywords: Animals; Anthozoa; Biodiversity; Coral Reefs; Environmental Monitoring; Indian Ocean; Seasons

Settlement patterns and temporal successions of coral reef cryptic communities affect diversity assessments using autonomous reef monitoring structures (ARMS) - Couëdel, Marion; Dettai, Agnès; Mireille M.M. Guillaume; Bonillo, Céline; Frattini, Baptiste; Bruggemann, J. Henrich (Scientific Reports, 2024)

Shark critical life stage vulnerability to monthly temperature variations under climate change - Coulon, Noémie; Pilet, Stanislas; Lizé, Anne; Lacoue-Labarthe, Thomas; Sturbois, Anthony; Toussaint, Aurèle; Feunteun, Eric; Carpentier, Alexandre (Marine Environmental Research, 2024)
In a 10-month experimental study, we assessed the combined impact of warming and acidification on critical life stages of small-spotted catshark (Scyliorhinus canicula). Using recently developed frameworks, we disentangled individual and group responses to two climate scenarios projected for 2100 (SSP2-4.5: Middle of the road and SSP5-8.5: Fossil-fueled Development). Seasonal temperature fluctuations revealed the acute vulnerability of embryos to summer temperatures, with hatching success ranging from 82% for the control and SSP2-4.5 treatments to only 11% for the SSP5-8.5 treatment. The death of embryos was preceded by distinct individual growth trajectories between the treatments, and also revealed inter-individual variations within treatments. Embryos with the lowest hatching success had lower yolk consumption rates, and growth rates associated with a lower energy assimilation, and almost all of them failed to transition to internal gills. Within 6 months after hatching, no additional mortality was observed due to cooler temperatures.
Keywords: Acidification; Ecological traits; Elasmobranch; Embryos; Global warming; Hatching success; IPCC; scenarios

Six années de suivi satellitaire des migrations pré et post nuptiales d'une Cigogne noire Ciconia nigra - Mohamed Lemine, MOHAMED HACEN; Paul, BROSSAULT; Ould Aveloitt, MOHAMED; Mohamed Mahmoud, ABIDINE; Cheikh, YEBOUK; Ould Sidaty, ZEIN EL ABIDINE; Abdeljabbar, QNINBA; Mohamed, FEKHAOUI; Chevallier, Damien (Alauda, 2024)
The six years of satellite monitoring of the Black Stork Anthéa provided unprecedented data on the migration trajectories of the same individual. This preliminary study highlighted differences in spring and autumn migratory trajectories in Africa and Europe. The results show that the total migration duration does not differ significantly between seasons, but prenuptial migration is longer and slower than postnuptial migration. The average daily speed in postnuptial migration is higher, probably due to the influence of the prevailing winds. Latitude influences speed, with a decrease north of 30°N, linked to more powerful thermal updrafts in Africa. The distances traveled in Africa present distinctive characteristics linked to the scarcity of resources, influencing the daily speed. Migratory stopovers are more frequent and last longer during prenuptial migration, probably to meet increased energetic needs. Anthéa showed, during these 6 years of monitoring, fidelity to wintering and breeding sites, although routes and stopovers vary between spring and autumn migrations due to meteorological factors and competition for resources in Africa. This study highlights the crucial importance of continuing research on the Black Stork to better understand its ecological needs. The information collected can guide habitat management, identify essential migratory corridors and encourage international cooperation to protect this endangered species. This knowledge is essential to ensure the long-term survival of the Black Stork and preserve the richness of our natural heritage
Keywords: Africa.; Ciconia nigra; Europe; pre and postnuptial migrations; Satellite monitoring

Spatial patterns and autocorrelation challenges in ecological conservation - Goberville, Eric (Peer Community in Ecology, 2024)

Structural and functional characterization of an egg-laying hormone signaling system in a lophotrochozoan – The pacific oyster (Crassostrea gigas) - Favrel, P.; Dubos, M.P.; Bernay, B.; Pasquier, J.; Schwartz, J.; Lefranc, B.; Mouret, L.; Guillaume Rivière; Leprince, J.; Bondon, A. (General and Comparative Endocrinology, 2024)

Testing for concordance between predicted species richness, past prioritization, and marine protected area designations in the western Indian Ocean - McClanahan, Tim R.; Friedlander, Alan M.; Wickel, Julien; Graham, Nicholas A. J.; Bruggemann, J.Henrich; Mireille M.M. Guillaume; Chabanet, P.; Porter, Sean; Schleyer, Michael H.; Azali, M. Kodia; Muthiga, N. A. (Conservation Biology, 2024)

Trace element variations in mussels' shells from continent to sea: The St. Lawrence system, Canada - Guillot, Alice; Barrat, Jean-Alix; Frédéric Olivier; Tremblay, Rejean; Saint-Louis, Richard; Rouget, Marie-Laure; Ben Salem, Douraied (Marine Pollution Bulletin, 2024)
Rare Earth Elements (REE) and several trace elements abundances in mussel's shells collected along the St. Lawrence River, the Estuary, and the Gulf of St. Lawrence (EGSL) reveal coherent chemical variations, with a sharp contrast between freshwater and seawater bivalves. In freshwater mussel's shells, Rare Earth Elements and Y (REY) patterns are rather flat. Their Mn and Ba concentrations are higher than those of EGSL mussel shells, which are much richer in Sr. Shale-normalized REY abundances in mussel's shells from the EGSL show positive anomalies in La and Y and well-marked negative anomalies in Ce, reflecting those of seawater. Prince Edward Island shells show light REE depletion relative to PAAS, positive La and Y anomalies, and negative Ce anomalies. Our data confirm the lack of detectable Gd pollution in the St. Lawrence River and in the EGSL, as well as Pb pollution at the mouth of the Saguenay Fjord and near Rimouski.
Keywords: Rare earth elements Trace elements Estuary Bivalve Shell Environmental proxy Pollution

Tracing the fate of seabird‐derived nitrogen in a coral reef using nitrate and coral skeleton nitrogen isotopes - Choisnard, Noémie; Duprey, Nicolas Noel; Wald, Tanja; Thibault, Martin; Houlbrèque, Fanny; Foreman, Alan D.; Cuet, Pascale; Mireille M.M. Guillaume; Vonhof, Hubert; Sigman, Daniel M.; Haug, Gerald H.; Maguer, Jean‐François; et al. (Limnology and Oceanography, 2024)

Variation in reproductive strategies of two amphidromous gobies of the West Indies: Sicydium plumieri and Sicydium punctatum - Labeille, Marion; Devaux, Alain; Lefrançois, Estelle; Abbaci, Khédidja; Santos, Raphaël; Besnard, Aurélien; Bony, Sylvie; Lareyre, Jean-Jacques; Teichert, Nils (Hydrobiologia, 2024)
The trade-off between current and future reproduction remains a central issue for understanding the diversity of fish life-histories along a slow-fast continuum. Fish living in rivers of tropical oceanic islands generally have a fast type life-history, but variations in key reproductive traits can occur in response to spatial changes in selection pressures. Here, we investigated the reproductive strategies of two sympatric amphidromous gobies widely distributed in Caribbean streams, Sicydium plumieri (n = 308) and Sicydium punctatum (n = 383), along a river gradient of Guadeloupe Island. Beyond the new insights provided on the reproductive traits (ovarian organization, gonadal development, length at maturity, and spawning season), the histological observations of testes and ovaries revealed variation in reproductive strategies. Sicydium punctatum showed a time-minimizing strategy, featuring early reproduction, a high spawning frequency, an extended reproductive period, and a broad spawning area along the river course. Sicydium plumieri displayed a size-maximizing strategy, featuring a delayed maturity, lower spawning frequency, and a shorter reproductive period restricted to the upper reaches of rivers. We discuss the advantages provided by these two strategies in response to the spatial changes in predation and disturbance levels along the upstream–downstream continuum, which probably affects the survival rate and mortality risk before the first reproduction.

Accounting for variability in life-history traits for the definition of amphidromous goby fry fisheries closure periods - Lagarde, Raphaël; Valade, Pierre; Teichert, Nils (Cybium, 2023)
Amphidromous goby fry (post-larvae and young juveniles) are traditionally fished when they arrive in rivers after their larval development at sea. In Reunion Island (Indian Ocean) two species of amphidromous goby are mainly targeted by the fisheries: the endemic Cotylopus acutipinnis and the cosmopolitan Sicyopterus lagocephalus. Despite the lack of quantitative data on these fisheries, their impact on populations is expected to be important because the catches can represent several tonnes per year. Consequently, fishery regulation changes have been proposed that increase the duration of the existing fisheries closure period of two weeks in March. We developed an approach to identify key periods for fisheries closure, including assessment of the proposed management scenario and several alternative protection scenarios, based on the maximization of fry abundance and on the variability of four life-history traits: (i) fry size and (ii) age at arrival in rivers, (iii) the time the juveniles spend in river before maturation and (iv) their migration behaviour. This approach is in seeking to preserve a high level of phenotypic diversity, which is predicted to promote population resilience. We conducted a multiple-criteria decision analysis to rank 4096 alternatives of fisheries closure periods, ranging from zero to 12 months, based on their propensity to maintain fry abundance and life history trait diversity. Finally, according to the type of fisheries closure period (discontinuous or continuous) and the proportion of annual abundance and variability of life-history traits preserved during the period (50% or 75%), we propose four different fisheries closures lasting from six to nine months.
Keywords: amphidromy; Bichiques; Conservation; diadromy; Indian Ocean; Management; recruitment

Aluminium-based galvanic anode impacts the photosynthesis of microphytobenthos and supports the bioaccumulation of metals released. - Levallois, Alexandre; Vivier, Baptiste; Caplat, Christelle; Goux, Didier; Orvain, Francis; Lebel, Jean-Marc; Claquin, Pascal; Chasselin, Léo; Basuyaux, Olivier; Serpentini, Antoine (Aquat Toxicol, 2023)
Very few studies have looked at the potential biological effects of degradation products of galvanic anodes particularly on primary producers which are central to food webs in marine ecosystems. The galvanic anode cathodic protection system (GACP) is widely used to protect submerged metallic structures from corrosion. Aluminium (Al) and zinc (Zn) are the main constituents of galvanic anodes and are therefore released in the marine environment by oxidation process to form ions or oxy-hydroxides. The main objective of our study was to evaluate the effects of the metals released from an aluminium-based galvanic anode on microphytobenthos performance in term of biofilm growing through the analysis of photosynthetic parameters, the determination of chlorophyll and extracellular polymeric substances (EPS). The bioaccumulation of Al and Zn were measured in the microphytobenthic compartment collected at the surface of polyvinyl chloride (PVC) plates exposed during 13 days to seawaters enriched in different concentrations of metals released from dissolution of one anode. Determination of bioconcentration factors confirmed that the microphytobenthos has incorporated Al. A significative effect was observed on the Chl a concentration for the higher tested concentration ([Al] = 210.1 ± 60.2 µg L  ; [Zn] = 20.2 ± 1.4 µg L  ). The seawater exposed to the anode affected the MPB productivity (ETRII) with consequences on acclimatation light (Ek), absorption cross section of PSII (σ), F/F and NPQ. Regarding the EPS production, the anode degradation presented an impact on high and low molecular weight of both carbohydrates and protein fractions of microphytobenthos suggesting that EPS play an essential role in sequestering metal contaminants to maintain the integrity of the biological membranes and the functionality of the cellular organelles. The accumulation of Al released by GACP in microphytobenthos cells could lead to physiologic problems in photosynthetic organisms.
Keywords: Aluminum; Bioaccumulation; Ecosystem; Electrodes; Photosynthesis; Water Pollutants, Chemical; Zinc

Artificial reef effectiveness changes among types as revealed by underwater hyperspectral imagery - Elisabeth Riera; Cédric Hubas; Ungermann, Mischa; Rigot, Guy; Pey, Alexis; Patrice Francour; Rossi, Fracesca (Restoration Ecology, 2023)
Artificial reefs (ARs) are designed to mimic natural habitats and promote marine life. Their effectiveness is however debatable and can depend on factors such as structural complexity and construction material. Old artificial reefs (OARs) were made of concrete mold of simple geometric shapes, limiting their ability to mimic the complexity of natural reefs. Recent advancements in three-dimentional (3D)-printing technology have enabled the creation of 3D-printed artificial reefs (3DRs) with biocompatible material and complex structures that can better simulate the natural habitats. We employed underwater hyperspectral technology to estimate the performance of these reefs and compare the benthic photosynthetic signal of natural reefs (NATs) with those of ARs (OARs and 3DRs) in coastal area of the north-western Mediterranean (France and Monaco Principality). We expected differences in reflectance signals between OARs and NATs, and signals closer to NATs in 3DRs than OARs. Underwater hyperspectral technology was able to detect higher chlorophyll-a derived signals on NATs than OARs. Moreover, the magnitude of differences between 3DRs and NATs was smaller than that between OARs and NATs. Although ARs were not capable of mimicking natural reefs, the use of 3D-printed ARs might ameliorate their effectiveness for coastal reconciliation.

Assessing the impacts of anthropogenic sounds on early stages of benthic invertebrates: The 'Larvosonic system'. - Frédéric Olivier; Gigot, Mathilde; Mathias, Delphine; Jézéquel, Youenn; Meziane, Tarik; L'Her, Christophe; Chauvaud, Laurent; Bonnel, Julien (Limnology and Oceanography: Methods, 2023)
Noise produced by human activities has increased in the oceans over the last decades. Whereas most studies have focused on the impact of anthropogenic noise on marine mammals and ﬁshes, those focusing on marine invertebrates  are  rarer  and  more  recent,  especially  when  considering  peri-metamorphic  benthic  stages,  highly sensitive to  anthropogenic perturbations. A  careful review  of the literature reveals  a  simplistic characterization of the acoustics within the containers used to quantify larval and juvenile responses to noise, thus weakening the conclusions of such works. To address this problem, we developed the Larvosonic system, a laboratory tank equipped  with  acoustic assets  to  assess  the  impacts  of  noise  on  young  stages  of  marine  invertebrates.  We  ﬁrst provide  a  careful  analysis  of  the  tank  sound  ﬁeld  using  different  sound types,  and  we  assess  the  effects  of expanded polystyrene units on the sounds emitted by a professional audio system in order to dampen reverbera- tion  and  resonance. Then,  we  apply  this  acoustic  calibration  to  the  effects  of  both  pile  driving  and  drilling noises on postlarvae of the scallop bivalve Pecten maximus. Acoustic recordings highlight that diffuser and bass trap  components  constitute  effective  underwater  sound  absorbents,  reducing  the  reﬂection  of  the  whole  fre- quency bandwidth. Scallop experiments reveal that both type and level of the tested noise inﬂuenced postlarval growth,  with  interactive  effects  between  trophic  environment  and  noise  level/spectra. The  Larvosonic  system thus constitutes an efﬁcient tool for bioacoustics research on bentho-planktonic invertebrate species."

Beach erosion aggravates the drastic decline in marine turtle populations in French Guiana - Chevallier, Damien; Girondot, Marc; Péron, Christina; Martin, Jordan; Bonola, Marc; Chevalier, Johan; de Thoisy, Benoît; Kelle, Laurent; Le Maho, Yvon; Gardel, Antoine; Anthony, Edward J. (Regional Environmental Change, 2023)

A benchmark for computational analysis of animal behavior, using animal-borne tags - Benjamin Hoffman; Maddie Cusimano; Vittorio Baglione; Daniela Canestrari; Chevallier, Damien; Dominic L. DeSantis; Lorène Jeantet; Monique A. Ladds; Takuya Maekawa; Vicente Mata-Silva; Víctor Moreno-González; Eva Trapote; et al. (arXiv, 2023)
Animal-borne sensors (‘bio-loggers’) can record a suite of kinematic and environmental data, which can elucidate animal ecophysiology and improve conservation efforts. Machine learning techniques are useful for interpreting the large amounts of data recorded by bio-loggers, but there exists no standard for comparing the different machine learning techniques in this domain. To address this, we present the Bio-logger Ethogram Benchmark (BEBE), a collection of datasets with behavioral annotations, standardized modeling tasks, and evaluation metrics. BEBE is to date the largest, most taxonomically diverse, publicly available benchmark of this type, and includes 1654 hours of data collected from 149 individuals across nine taxa. We evaluate the performance of ten different machine learning methods on BEBE, and identify key challenges to be addressed in future work. Datasets, models, and evaluation code are made publicly available at https://github.com/earthspecies/ BEBE, to enable community use of BEBE as a point of comparison in methods development.
Keywords: Accelerometers; animal behavior; Bio-loggers; Clustering; Machine Learning; Time series

Benchmarking global biodiversity of decapod crustaceans (Crustacea: Decapoda) - De Grave, Sammy; Decock, Wim; Dekeyzer, Stefanie; Davie, Peter J F; Fransen, Charles H J M; Boyko, Christopher B; Poore, Gary C B; Macpherson, Enrique; Ahyong, Shane T; Crandall, Keith A; de Mazancourt, Valentin; Osawa, Masayuki; et al. (Journal of Crustacean Biology, 2023)

Biogeographical snapshot of life-history traits of European silver eels: insights from otolith microchemistry - Teichert, Nils; Bourillon, Bastien; Suzuki, Kyoko; Acou, Anthony; Alexandre Carpentier; Kuroki, Mari; Righton, David; Thomas Trancart; Virag, Laure-Sarah; Walker, Alan; Otake, Tsuguo; Eric Feunteun (Aquatic Sciences, 2023)
Life-history traits of eels display a high level of phenotypic plasticity in response to large-scale biogeographical drivers, as well as local conditions encountered during the continental phase. Here, we provided a biogeographical snapshot of the variability of life-history traits of eels (Anguilla anguilla), across a large proportion of their natural distribution range. Silver eels (n = 99) were collected across eleven European catchments to investigate how life-history traits vary along geographical and saline habitats, as it was inferred from the Sr:Ca ratio in otoliths. Among 13 life-history traits tested, 3 of them such as total length, body or liver weight were related to geographical coordinates. Overall, eels grow faster in southern Europe and migrate earlier suggesting that the silvering process is related to the local growth conditions more than fish age. The salinity profiles revealed by the otoliths’ Sr:Ca ratios indicate that eels with a brackish life-history generally grow faster, reach larger size-at-age, and have a better condition than eels living in freshwater. This observation associated with the lower abundance of the sanguivorous swimbladder nematode, Anguillicola crassus, confirms the importance of brackish areas for sustaining the eel production. A large proportion of the observed variation of life-history traits remained unexplained by the biogeographical trends and salinity condition, which suggests that other drivers act at the catchment scale.
Keywords: Anguilla anguilla; Biogeography; Brackish habitat; otolith; phenotypic plasticity; Sr:Ca ratio

Comparative efects of trace metal elements released from dissolution of aluminum‑based galvanic anodes, aluminum chloride, zinc chloride, and their mixture on the development of the Pacifc oyster D‑larvae, Crassostrea gigas - Levallois, A; Costil, K; Caplat, C; Basuyaux, O; Lebel, J.M.; Guégan, C; Serpentini, A. (Environmental Science and Pollution Research, 2023)
As the most abundant metal in the earth’s crust, aluminum (Al) is used in many sectors, and nowadays, there is an increase in anthropogenic releases to aquatic ecosystems. This is particularly true in the context of corrosion protection systems involving galvanic anodes, which are mostly made of Al. Corroded instead of the steel structures they protect, galvanic anodes are described as sacrifcial anodes. In contact with seawater, they undergo oxidation and release various metals in the form of ions or oxy-hydroxides into the marine environment, mainly Al and zinc (Zn). Several studies agree that Al increases the incidence of abnormal development in bivalve larvae from 150 μg L−1 which is close to the highest Al concentrations recorded in coastal waters. Therefore, we studied the impact of the cocktail of metals released by aluminum-based galvanic anodes on the development of Crassostrea gigas larvae, which we compared to the efects of aluminum chloride hexahydrate and zinc chloride alone and their mixture. The anode solution was realized thanks to an experimental device simulating the dissolution of a galvanic anode in the marine environment in order to reproduce the cocktail of metal species. We calculated an EC50 of 193.55 μg L−1 and 100.05 μg L−1 for Al and Zn chloride alone, respectively, and we highlighted an EC50 of 190.22 μg L−1 for the galvanic anode based on Al concentration. The mixture of the two metals in their chloride form resulted in the observation of additive and synergistic efects, which underlines the importance of considering the cocktail efect in ecotoxicological studies.

Comparative effects of trace metal elements released from dissolution of aluminum-based galvanic anodes, aluminum chloride, zinc chloride, and their mixture on the development of the Pacific oyster D-larvae, Crassostrea gigas - Levallois, Alexandre; Katherine Costil; Caplat, Christelle; Basuyaux, Olivier; Lebel, Jean-Marc; Guegan, Claire; Serpentini, Antoine (Environmental Science and Pollution Research, 2023)

Comparative Proteome Analysis of Four Stages of Spermatogenesis in the Small-Spotted Catshark (Scyliorhinus canicula) - Jeanne, Fabian; Bernay, Benoît; Pascal Sourdaine (Journal of Proteome Research, 2023)

Complex drivers of primary production along an anthropised estuary (Seine estuary—France) - Serre-Fredj, Léon; Chasselin, Léo; Jolly, Orianne; Pascal Claquin (Frontiers in Environmental Science, 2023)

Coopération scientifiques-pêcheurs-gestionnaire dans le suivi à long terme de la déprédation à Kerguelen et Crozet - Gasco, Nicolas; Tixier, Paul (VertigO-la revue électronique en sciences de l'environnement, 2023)

Coral reef fish communities of natural habitats and man-made coastal structures in Bora-Bora (French Polynesia) - Gairin, Emma; Minier, Lana; Claverie, Thomas; Charlotte R. Dromard; Maueau, Tehani; Collin, Antoine; Frédérich, Bruno; Bertucci, Frédéric; Lecchini, David (Belgian Journal of Zoology, 2023)

Current knowledge of New Caledonian marine and freshwater ichthyofauna, SW Pacific Ocean: Diversity, exploitation, threats and management actions. - Yves Letourneur; Charpin Nicolas; Marion Mennesson; Philippe Keith (Cybium, 2023)

Data quality control considerations in multivariate environmental monitoring: experience of the French coastal network SOMLIT - Breton, Elsa; Savoye, Nicolas; Rimmelin-Maury, Peggy; Sautour, Benoit; Goberville, Eric; Lheureux, Arnaud; Cariou, Thierry; Ferreira, Sophie; Agogue, Helene; Alliouane, Samir; Aubert, Fabien; Aubin, Sébastien; et al. (Frontiers in Marine Science, 2023)

Decoupling carry-over effects from environment in fish nursery grounds - Teichert, Nils; Lizé, Anne; Cabral, Henrique; Acou, Anthony; Trancart, Thomas; Virag, Laure-Sarah; Feunteun, Eric; Alexandre Carpentier (Science of The Total Environment, 2023)
Life-history trait expression not only depends on the current environmental constraints, but also on the past ones that shaped traits expressed earlier in life. Such an effect, named carry-over, can occur in fish nursery grounds when juvenile performances after settlement are influenced by their larval traits in combination with conditions experienced in nurseries. To date, the impacts of environmental and human stressors on post-settlement traits have been assessed, but independently from larval traits, so that the contributions of environmental versus carry-over constraints remain unquantified. Here, we used a reconstructive approach based on otolith microstructure to investigate how carry-over and environment affect life-history traits of the European seabass, Dicentrarchus labrax. In the northeast Atlantic Ocean, seabass juveniles were collected in six French estuarine nursery areas with contrasted environmental conditions (water temperature, salinity, food availability, and anthropogenic impacts), and five of their life-history traits across ontogenetic stages were measured (pelagic growth, larval duration, size at settlement, post-settlement growth and body condition). Piecewise structural equation model emphasized the strong co-variation of larval traits in response to food availability and temperature in the pelagic environment, stressing that fast growing larvae are characterized by shorter pelagic larval duration, but larger size at recruitment. However, the magnitude of carry-over effects greatly varied between traits, revealing that larval trait impacts on post-settlement traits remained minor as compared to the nursery environment. In estuarine nurseries, our findings suggest that resource allocation results from a trade-off between somatic growth and energy storage. Fish juveniles exposed to anthropogenic stress or risk of food limitation tended to predominantly invest in storage, whereas individuals in favourable conditions allocated their resources in somatic growth. These findings highlight the importance of heterogeneity in pelagic and nursery environments in understanding trait variations and population dynamic of estuarine dependent fish.

Diet quality determines blue mussel physiological status: A long-term experimental multi-biomarker approach - Liénart, Camilla; Tedengren, Michael; Garbaras, Andrius; Lim, Hwanmi; Chynel, Mathias; Robinson, Christophe; Tarik Meziane; Karlson, Agnes M.L. (Journal of Experimental Marine Biology and Ecology, 2023)

Discovery of a Digenean (Cryptogonimidae) Living in a Cleft-Lipped Goby, Sicyopterus cynocephalus (Teleostei: Gobiidae) from Ranongga Island, Solomon Islands: Analysis of Multiple Ribosomal DNA Regions - Mathews, Patrick D.; Nicolas Rabet; L. Espinoza, Luis; Vincent Haÿ; Céline Bonillo; Philippe Keith; Clara Lord; Audebert, Fabienne (Pathogens, 2023)

Duplicated paralog of sulfide: quinone oxidoreductase contributes to the adaptation to hydrogen sulfide-rich environment in the hydrothermal vent crab, Xenograpsus testudinatus - Chen, Chi; Wu, Guan-Chung; Chung, Yao-Tse; Li, Hau-Wen; Chou, Pei-Hsuan; Tseng, Yung-Che; Chen, Chieh-Jhen; Sylvie Dufour; Chang, Ching-Fong (Science of The Total Environment, 2023)

Dynamics of the Benthic Communities of Pigeon Islets (Guadeloupe Island, Lesser Antilles) from 2012 to 2021 Monitored by a Photo-Quadrats Technique - Malahel, Hanna-May; Freschet, Camille; Mège, Simone; Bouchon, Claude (Gulf and Caribbean Research, 2023)
Since 2012, the benthic communities of the Pigeon Islets (Guadeloupe Island, Lesser Antilles) have been monitored biannually by the National Park of Guadeloupe using photo—quadrats. This monitoring was carried out at 12 coral reef stations distributed around the islets. The data collected from 2012 to 2021 highlight the significant events that disrupted the coral communities of Guadeloupe. Among these remarkable phenomena, an episode of coral bleaching occurred in 2019, followed by the appearance of a new coral disease, Stony Coral Tissue Loss Disease (SCTLD), in 2020. As a result of these threats, a drop of 54% of coral cover was observed in the monitored sites, accompanied by a rise of 16% of the surface occupied by macroalgae. The protocol set up by the National Park of Guadeloupe was found to be efficient to follow the temporal dynamics of benthic reef communities.
Keywords: coral bleaching; Coral communities; coral disease; SCTLD; temporal dynamics

An ecosystem-wide approach for assessing the spatialized cumulative effects of local and global changes on coastal ecosystem functioningAbstract - Nogues, Quentin; Bourdaud, Pierre; Araignous, Emma; Halouani, Ghassen; Ben Rais Lasram, Frida; Dauvin, Jean-Claude; Le Loc'h, François; Nathalie Niquil (ICES Journal of Marine Science, 2023)

Efects on Growth of Juvenile Abalones Haliotis tuberculata Under Chronic Exposition to Metals Released from the Dissolution of an Aluminium‑Based Galvanic Anode - Nivelais, L; Levallois, A; Basuyaux, O; Costil, K; Lebel, J M; Larsonneur, S; Guichard, G; Serpentini, A.; Caplat, C (Archives of Environmental Contamination and Toxicology, 2023)
In the marine environment, the galvanic anode cathodic protection system (GACP) undergoes oxidation and releases metals in the forms of ions or oxy-hydroxides into the environment. The objective of the present study was to investigate the toxicity of a cocktail of metals released from the dissolution of an aluminium-based galvanic anode (~95% Al,~5% Zn) on the abalone Haliotis tuberculata. Juveniles were exposed for 16 weeks (i.e. 12 weeks of exposure and 4 weeks of decontamination phase) and their growth, intake rate, conversion rate and metallic concentrations were monitored. A total of 6 conditions were tested: a control, 4 concentrations based on Al and a trophic control. Results showed that the mortality reached 57% for individuals exposed to 1125 µg L−1 of Al, and the abalone growth signifcantly decreased for an Al concentration greater than 495 µg L−1. At the highest exposure concentration, intake rate measurements revealed that the appetite of abalones was afected, supported by the large increase in the conversion rate which was indicative of a poor feed efciency. The monitoring of metallic concentrations showed that H. tuberculata strongly bioconcentrated Al relative to zinc. The diet did not appear to be the primary pathway for metal entry. Concentrations that signifcantly impacted abalone growth and survival during the experiment were higher than those found in natural environment, but the bioconcentration of Al into the tissues of a primary consumer such as abalone may be a potential pathway for Al to enter food webs.

The effect of interspecific and intraspecific diversity on microplastic ingestion in two co-occurring mussel species in South Africa - Lorenzo Cozzolino; Nicastro, Katy R.; Sébastien Lefebvre; Luana Corona; Pierre William Froneman; Christopher D. McQuaid; Zardi, Gerardo I. (Marine Pollution Bulletin, 2023)

Effects of anthropogenic magnetic fields on the behavior of a major predator of the intertidal and subtidal zones, the velvet crab Necora puber - Albert, Luana; Frédéric Olivier; Jolivet, Aurélie; Chauvaud, Laurent; Chauvaud, Sylvain (Marine Environmental Research, 2023)
With the progress of the offshore renewable energy sector and electrical interconnection projects, a substantial rise in the number of submarine power cables is expected soon. Such cables emit either alternating or direct current magnetic fields whose impact on marine invertebrates is currently unknown and hardly studied. In this context, this study aimed to assess potential short-term exposure (30 min) effects of both alternating and direct magnetic fields of increasing intensity (72–304 μT) on the behavior of the high-ecological value velvet crab (Necora puber). Three experiments were designed to evaluate whether the strongest magnetic field intensities induce crabs’ attraction or repulsion responses, and whether foraging and sheltering behaviors may be modified. We extracted from video analyses several variables as the time budgets crabs spent immobile, moving, feeding, or sheltering as well as total and maximal distance reached in the magnetic field (MF) gradient. The crabs exposed to artificial MF did not exhibit significant behavioral changes compared with those exposed to the “natural” MF. Overall, our results suggest that, at such intensities, artificial magnetic fields do not significantly alter behaviors of N. puber. Nevertheless, future studies should be conducted to examine the effects of longer exposure periods and to detect potential habituation or resilience processes.
Keywords: Behavior; Crustaceans; Magnetic fields; Magneto-sensitivity; Marine renewable energy devices; Submarine power cables

Effects of anthropogenic sounds on the behavior and physiology of the Eastern oyster (Crassostrea virginica) - Ledoux, Tamara; Clements, Jeff C.; Comeau, Luc A.; Cervello, Gauthier; Tremblay, Rejean; Frédéric Olivier; Chauvaud, Laurent; Bernier, Renée Y.; Lamarre, Simon G. (Frontiers in Marine Science, 2023)
Introduction: Noise pollution is a major stressor in the marine environment; however, responses of economically and ecologically important invertebrates, such as oysters, are largely unknown. Methods: Under laboratory conditions, we measured acute behavioral and physiological responses of eastern oysters (Crassostrea virginica) to sound treatments mimicking human activity in the environment. Results: Oysters immediately reduced their valve gape under simulated pile driving sound, but not drilling or boating sound. Pile-driving sound also reduced adductor muscle glycogen, but not triglyceride. None of the sound treatments affected longer-term (12 hours) valve activity levels after the administration of sounds. Interestingly, neither acute nor longer-term valve gaping responses were correlated with glycogen content on the individual level, suggesting that the observed behavioral responses to sound were not mechanistically driven by energetic physiology. Discussion: Our results suggest that C. virginica responds to some, but not all, anthropogenic sounds. Future studies assessing downstream effects on growth, reproduction, and survival in the wild are needed to better understand the effects of anthropogenic sounds on oyster populations and the biological communities they support.
Keywords: animal behavior; coastal ecosystem; energetic physiology; environmental stressors; global change biology; noise pollution

Effects on Growth of Juvenile Abalones Haliotis tuberculata Under Chronic Exposition to Metals Released from the Dissolution of an Aluminium-Based Galvanic Anode - Nivelais, Laureen; Levallois, Alexandre; Basuyaux, Olivier; Katherine Costil; Lebel, Jean-Marc; Larsonneur, Solveig; Guichard, Gwendoline; Serpentini, Antoine; Caplat, Christelle (Archives of Environmental Contamination and Toxicology, 2023)
In the marine environment, the galvanic anode cathodic protection system (GACP) undergoes oxidation and releases metals in the forms of ions or oxy-hydroxides into the environment. The objective of the present study was to investigate the toxicity of a cocktail of metals released from the dissolution of an aluminium-based galvanic anode (~95% Al,~5% Zn) on the abalone Haliotis tuberculata. Juveniles were exposed for 16 weeks (i.e. 12 weeks of exposure and 4 weeks of decontamination phase) and their growth, intake rate, conversion rate and metallic concentrations were monitored. A total of 6 conditions were tested: a control, 4 concentrations based on Al and a trophic control. Results showed that the mortality reached 57% for individuals exposed to 1125 µg L−1 of Al, and the abalone growth signifcantly decreased for an Al concentration greater than 495 µg L−1. At the highest exposure concentration, intake rate measurements revealed that the appetite of abalones was afected, supported by the large increase in the conversion rate which was indicative of a poor feed efciency. The monitoring of metallic concentrations showed that H. tuberculata strongly bioconcentrated Al relative to zinc. The diet did not appear to be the primary pathway for metal entry. Concentrations that signifcantly impacted abalone growth and survival during the experiment were higher than those found in natural environment, but the bioconcentration of Al into the tissues of a primary consumer such as abalone may be a potential pathway for Al to enter food webs.

El Observatorio permanente del Lago Titicaca (OLT) – Investigación y monitoreo de la eutrofización del Lago Menor con estaciones limnológicas, boya HydroMet y teledetección satelital. - Xavier Lazzaro; Viviana Edith Cruz Hernández; Marcela Andrea Ormachea Rojas; William Gustavo Lanza Aguilar; Javier Alberto Maldonado Alfaro; Javier Núñez Villalba (IRD/BOREA, UMSA/IE & UMSA/IIGEO., 2023)

The epitome of data paucity: Deep-sea habitats of the Southern Indian Ocean - Ramiro-Sánchez, Berta; Martin Alexis; Leroy, Boris (Biological Conservation, 2023)

Euendolithic Infestation of Mussel Shells Indirectly Improves the Thermal Buffering Offered by Mussel Beds to Associated Molluscs, but One Size Does Not Fit All - Dievart, Alexia M.; Christopher D. McQuaid; Zardi, Gerardo I.; Nicastro, Katy R.; Pierre William Froneman (Diversity, 2023)

Evidence of backcross inviability and mitochondrial DNA paternal leakage in sea turtle hybrids - Vilaça, Sibelle T.; Maroso, Francesco; Lara, Paulo; de Thoisy, Benoît; Chevallier, Damien; Arantes, Larissa Souza; Santos, Fabricio R.; Bertorelle, Giorgio; Mazzoni, Camila J. (Molecular Ecology, 2023)
Hybridization is known to be part of many species' evolutionary history. Sea turtles have a fascinating hybridization system in which species separated by as much as 43 million years are still capable of hybridizing. Indeed, the largest nesting populations in Brazil of loggerheads (Caretta caretta) and hawksbills (Eretmochelys imbricata) have a high incidence of hybrids between these two species. A third species, olive ridleys (Lepidochelys olivacea), is also known to hybridize although at a smaller scale. Here, we used restriction site-associated DNA sequencing (RAD-Seq) markers, mitogenomes, and satellite-telemetry to investigate the patterns of hybridization and introgression in the Brazilian sea turtle population and their relationship with the migratory behaviours between feeding and nesting aggregations. We also explicitly test if the mixing of two divergent genomes in sea turtle hybrids causes mitochondrial paternal leakage. We developed a new species-specific PCR-assay capable of detecting mitochondrial DNA (mtDNA) inheritance from both parental species and performed ultra-deep sequencing to estimate the abundance of each mtDNA type. Our results show that all adult hybrids are first generation (F1) and most display a loggerhead migratory behaviour. We detected paternal leakage in F1 hybrids and different proportions of mitochondria from maternal and paternal species. Although previous studies showed no significant fitness decrease in hatchlings, our results support genetically-related hybrid breakdown possibly caused by cytonuclear incompatibility. Further research on hybrids from other populations in addition to Brazil and between different species will show if backcross inviability and mitochondrial paternal leakage is observed across sea turtle species.
Keywords: Brazil; ddRAD; hybridization; introgression; Marine turtles; mitogenomes

Feeding ecology of two deep-sea skates bycaught on demersal longlines off Kerguelen Islands, Southern Indian Ocean - Faure, Johanna; Nicolas Gasco; Céline Bonillo; Munaron, Jean-Marie; Cherel, Yves; Clara Péron (Deep Sea Research Part I: Oceanographic Research Papers, 2023)

First isolation of Francisella halioticida strains from blue mussel (Mytilus edulis) in Normandy, France - Bouras, Hélène; Quesnelle, Yann; Barozet, Alix; Goux, Didier; Blin, Jean-Louis; Savary, Manuel; Céline Zatylny-Gaudin; Maryline Houssin (Journal of Invertebrate Pathology, 2023)

Global assessment of marine plastic exposure risk for oceanic birds - Clark, Bethany L.; Carneiro, Ana P.B.; Pearmain, Elisabeth J.; Rouyer, Marie-Morgane; ...; Clara Péron; al. (Nature Communications, 2023)
Plastic pollution is distributed patchily around the world’s oceans. Likewise, marine organisms that are vulnerable to plastic ingestion or entanglement have uneven distributions. Understanding where wildlife encounters plastic is crucial for targeting research and mitigation. Oceanic seabirds, particularly petrels, frequently ingest plastic, are highly threatened, and cover vast distances during foraging and migration. However, the spatial overlap between petrels and plastics is poorly understood. Here we combine marine plastic density estimates with individual movement data for 7137 birds of 77 petrel species to estimate relative exposure risk. We identify high exposure risk areas in the Mediterranean and Black seas, and the northeast Pacific, northwest Pacific, South Atlantic and southwest Indian oceans. Plastic exposure risk varies greatly among species and populations, and between breeding and non-breeding seasons. Exposure risk is disproportionately high for Threatened species. Outside the Mediterranean and Black seas, exposure risk is highest in the high seas and Exclusive Economic Zones (EEZs) of the USA, Japan, and the UK. Birds generally had higher plastic exposure risk outside the EEZ of the country where they breed. We identify conservation and research priorities, and highlight that international collaboration is key to addressing the impacts of marine plastic on wide-ranging species.

The goby fish Sicydium spp. as valuable sentinel species towards the chemical stress in freshwater bodies of West Indies - Bony, S.; Labeille, M.; Lefrancois, E.; Noury, P.; Olivier, J.M.; Santos, R.; Teichert, Nils; Besnard, A.; Devaux, A. (Aquatic Toxicology, 2023)
Implementation of the European Water Framework Directive in tropical areas such as the French West Indies (FWI) requires to select relevant aquatic sentinel species for investigating the ecological status of surface waters. The present work aimed to study the biological response of the widespread fish Sicydium spp. towards river chemical quality in Guadeloupe island through a set of proper biomarkers. During a 2-year survey, the hepatic EROD activity, the micronucleus formation and the level of primary DNA strand breaks in erythrocytes were measured respectively as an enzymatic biomarker of exposure and genotoxicity endpoints in fish living upstream and downstream of two chemically-contrasted rivers. Hepatic EROD activity was shown to be variable along the time but always significantly higher in fish from the most contaminated river (Rivière aux Herbes) compared to the low contaminated one (Grande Rivière de Vieux-Habitants). Fish size did not influence EROD activity. Female fish exhibited a lower EROD activity compared to males depending on the catching period. We observed significant temporal variation in micronucleus frequency and primary DNA damage level measured in fish erythrocytes that did not depend on the fish size. Micronucleus frequency and to a lesser extent DNA damage were significantly higher in fish from the Rivière aux Herbes compared to the Grande Rivière de Vieux-Habitants. Our results argue for the interest of using Sicydium spp. as sentinel species to assess river quality and chemical pressures in FWI.

How ocean warming and acidification affect the life cycle of six worldwide commercialised sea urchin species: A review - Uboldi, Thomas; Frédéric Olivier; Chauvaud, Laurent; Tremblay, Rejean (Aquaculture, Fish and Fisheries, 2023)
Ongoing global changes are expected to affect the worldwide production of many fisheries and aquaculture systems. Because invertebrates represent a relevant industry, it is crucial to anticipate challenges that are resulting from the current environmental alterations. In this review, we rely on the estimated physiological limits of six commercialised species of sea urchins (Loxechinus albus, Mesocentrotus franciscanus, Paracentrotus lividus, Strongylocentrotus droebachiensis, Strongylocentrotus  intermedius and Strongylocentrotus purpuratus) to define the vulnerability (or resilience) of their populations facing ocean warming and acidification (OW&A). Considering that coastal systems do not change uniformly and that the populations’ response to stressors varies depending on their origin, we investigate the effects of OW&A by including studies that estimate future environmental mutations within their distribution areas. Crossreferencing 79 studies, we find that several sea urchin populations are potentially vulnerable to the predicted OW&A as environmental conditions in certain regions are expected to shift beyond their estimated physiological limit of tolerance. Specifically, while upper thermal thresholds seem to be respected for L. albus along the SW American coast, M. franciscanus and S. purpuratus southern populations appear to be vulnerable in NW America. Moreover, as a result of the strong warming expected in the Arctic and sub-Arctic regions, the local productivity of S. droebachiensis is also potentially largely affected. Finally, populations of S. intermedius and P. lividus found in northern Japan and eastern Mediterranean respectively, are supposed to decline due to large environmental changes brought about by OW&A. This review highlights the status and the potential of local adaptation of a number of sea urchin populations in response to changing environmental conditions, revealing possible future challenges for various local fishing industries.
Keywords: Aquaculture; ecophysiology; fishery; Ocean acidification; ocean warming; sea urchin

Identification of microbial exopolymer producers in sandy and muddy intertidal sediments by compound-specific isotope analysis - Cédric Hubas; Gaubert-Boussarie, Julie; D’Hondt, An-Sofie; Bruno Jesus; Lamy, Dominique; Meleder, Vona; Prins, Antoine; Rosa, Philippe; Stock, Willem; Sabbe, Koen (Peer Community Journal, 2023)
Extracellular polymeric substances (EPS) refer to a wide variety of high molecular weight molecules secreted outside the cell membrane by biofilm microorganisms. In the present study, EPS from marine microphytobenthic biofilms were extracted and their isotope ratios were analysed. A comparison of these ratios with the carbon isotope ratios of fatty acid biomarkers allowed the identification of the main EPS producers of two contrasting types of intertidal marine sediments. Our study reveals that EPS sources are more diverse in sandy sediments than in muddy sediments. We also found distinct patterns in the production and breakdown of EPS in sandy and muddy environments. The main difference observed was in how epipelic and epipsammic diatoms affected the chemistry of EPS, which had significant implications for the growth of bacteria specialized in utilizing EPS. These differences were likely linked to variations in the functioning of epipelic and epipsammic communities, specifically in how EPS was used either for motility or for cell attachment.

Identifying global research and conservation priorities for Columbidae: a quantitative approach using random forest models - Cambrone, Christopher; Jean-Pierre, Aurélie; Bezault, Etienne; Cézilly, Frank (Frontiers in Ecology and Evolution, 2023)
The family of Columbidae, including pigeons and doves, remains understudied despite their patrimonial value and high ecological and conservation relevance. Currently, 353 extant columbid species are listed in the IUCN red list, with about 20% of them being threatened with extinction. However, there has been little effort so far to synthetize the available information on factors influencing extinction risk and the allocation of research effort among columbid species. In this context, using random forest models, the present study aims at quantitatively assessing to what extent environmental, life history and socio-political factors may drive the extinction risk of pigeons and doves and explain differences in scientific attention among species. We found that high risk of extinction in columbids is associated with small historical range, exposure to invasive alien mammals and living in isolated islands and/or at low altitudes, while the probability of population decline is associated with species body size, surrounding human density and narrow habitat breadth. We also evidenced a large disparity between species or population extinction risk and scientific interest. Indeed, most of the studies on columbids have been conducted by scientists from North America and Western Europe on their local species, whereas species from biodiversity hotspots, which are more at risk of extinction, have comparatively received little attention. This unequal acquisition of knowledge creates gaps that deserve to be filled in order to have a good appreciation of extinction risk in columbids and associated threats, through fair transnational cooperation, academic training and regional coordination in conservation-oriented research on columbids.

Impact assessment of metals realeased by aluminium-based galvanic anode on the physiology of the abalone Haliotis tuberculata in controlled conditions - Alexandre Levallois; Nivelais, Laureen; Christelle Caplat; Jean-Marc Lebel; Basuyaux, Olivier; Katherine Costil; Antoine Serpentini (Ecotoxicology, 2023)
To protect metal structures immersed in the sea from corrosion, the galvanic anode cathodic protection system (GACP) is often applied. However, this association leads to continuous oxidation of the galvanic anode and therefore to a release of a metal cocktail in the forms of ions or oxy-hydroxides. Therefore, the main objective of our study was to investigate the toxicity of elements released from the dissolution of an aluminium-based galvanic anode (∼95% Al, ∼5% Zn, <0.1% for In, Cu, Cd, Mn, Fe) on a grazing gastropod, the abalone Haliotis tuberculata. The present study was carried out in complement to other research currently in submission. Gastropods were exposed for 16 weeks (12 weeks of exposure and 4 weeks of decontamination phase) to 6 conditions including a control, 4 concentrations based on total aluminium level (86, 425, 1096 and 3549 µg L−1 ) and a trophic control, corresponding to abalones placed in non-contaminated natural seawater but fed with contaminated algae. The effects of metals on growth, glycogen levels, brix index of hemolymph, MDA levels in digestive gland and gills, hemocyte phagocytic activity, ROS production, lysosomal system and the progress of gametogenesis were investigated throughout the entire exposure allowing the realization of kinetics. The results revealed that the aluminiumbased anode does not seem to have an effect on the health status of the individuals for environmentally realistic concentrations. However, in extreme conditions strong effects were reported on the growth, immune system and reproduction of abalone.

Impact of anthropogenic sounds (pile driving, drilling and vessels) on the development of model species involved in marine biofoulingTable_1.docx - Cervello, Gauthier; Frédéric Olivier; Chauvaud, Laurent; Winkler, Gesche; Mathias, Delphine; Juanes, Francis; Tremblay, Rejean (Frontiers in Marine Science, 2023)
The uncontrolled colonization of benthic organisms on submerged surfaces, also called biofouling, causes severe damage in the shipping and aquaculture industries. Biofouling starts with a benthic biofilm composed of a complex assemblage of microbes, bacteria and benthic diatoms, calledmicrofouling, on whichmacrofouling invertebrate species settle and grow. Invertebrate larvae may use natural soundscapes to orientate inshore and choose their optimal habitat. Recent studies have demonstrated that ship sounds enhance the larval settlement and growth of several invertebrate species, such as mussels, associated with biofouling. Among invertebrates, effects of sound generated by offshore human activities are still poorly studied. This study aims to assess the effect of pile driving, drilling and vessel sounds on model species associated with micro and macrofouling. First, the biofilm development of Navicula pelliculosa and Amphora coffeaeformis was assessed, then, the larval development of the blue mussel (Mytilus edulis) was evaluated from the D-veliger to the postlarval stage. Mussel larvae and microalgae were exposed 12 h each day in tanks (Larvosonic) adapted to sound experiments under controlled conditions. All anthropogenic sounds induced a thinner N. pelliculosa biofilm coupled with a lower microalgae concentration. The drilling sound had a stronger effect on the biofilm thickness. The drilling sound significantly reduced the pediveliger settlement and the postlarvae clearance rate by 70.4% and tended to diminish settler sizes compared to control sound. Contrary to our expectation, pile driving tended to enhance larval recruitment by 22% (P=0.077) and the boat sound did not stimulate larval settlements or recruitment. Drilling sound generated a stressful acoustic environment for pediveliger settlements and postlarvae seem to maintain their shell valves closed to preserve energy. We identify potential causes andmechanisms involved in these impacts of anthropophony on larval ecology and microfouling dynamics.
Keywords: anthropogenic sounds; Benthic diatoms; Bioacoustics; Biofouling; larval development; settlement

Impact of vessel noise on feeding behavior and growth of zooplanktonic species - Aspirault, Ariane; Winkler, Gesche; Jolivet, Aurélie; Audet, Céline; Chauvaud, Laurent; Juanes, Francis; Frédéric Olivier; Tremblay, Rejean (Frontiers in Marine Science, 2023)
Anthropogenic noise is a pervasive feature of the coastal ocean soundscape and is intensifying as vessel traffic activity increases. Low-frequency sounds from wave action on coastal reefs or anthropogenic noise have been shown to initiate larval settlement of marine invertebrates and accelerate metamorphosis to juvenile stages. These results suggest that some planktonic species can perceive and be impacted by anthropogenic sound. Hence, we tested the hypothesis that vessel noise has an impact on the feeding behavior of blue mussel (Mytilus edulis) veligers and of the copepod Eurytemora herdmani as well as on the growth of the rotifer Brachionus plicatilis. The results show that microalgae and feeding behavior of early life stages of mussels and copepods are not influenced by the presence of vessel noise. The growth of the rotifers was similar between the two sound treatments, but rotifers’ egg production in the absence of vessel noise was higher and eggs were also larger. Our results suggest that the effects of noise on plankton are complex; much more work is needed to unravel these often subtle effects.
Keywords: bioacoustic; clearance rate; Growth; vessel noise emission; Zooplankton

Influence of nutrient enrichment on colonisation and photosynthetic parameters of hard substrate marine microphytobenthos - Vivier, Baptiste; Faucheux-Bourlot, Caroline; Orvain, Francis; Chasselin, Léo; Jolly, Orianne; Navon, Maxime; Boutouil, Mohamed; Goux, Didier; Dauvin, Jean-Claude; Pascal Claquin (Biofouling, 2023)
This study aimed to assess the influence of nutrient enrichment on the development of microalgal biofilm on concrete and PVC cubes. Three mesocosms were utilized to create a nutrient gradient over a period of 28 days. Various parameters including biomass, photosynthetic activity, microtopography, and extracellular polymeric substances (EPS) were measured. Imaging PAM techniques were employed to obtain surface-wide data. Results revealed that nutrient availability had no significant impact on Chl a biomass and the maximum quantum efficiency of PSII (Fv/Fm). The photosynthetic capacity and efficiency were minimally affected by nutrient availability. Interestingly, the relationship between microphytobenthic (MPB) biomass and photosynthesis and surface rugosity exhibited distinct patterns. Negative reliefs showed a strong correlation with Fv/Fm, while no clear pattern emerged for biomass on rough concrete structures. Overall, our findings demonstrate that under conditions of heightened eutrophication, biofilm photosynthesis thrives in the fissures and crevasses of colonized structures regardless of nutrient levels. This investigation provides valuable insights into the interplay between nutrient availability and surface rugosity.

Influence of Nutrient Gradient on Phytoplankton Size Structure, Primary Production and Carbon Transfer Pathway in a Highly Productive Area (SE Mediterranean) - Chkili Oumayma; Meddeb Marouan; Mejri Kousri Kaouther; Melliti Ben Garali Sondes; Makhlouf Belkhahia Nouha; Tedetti Marc; Pagano Marc; Belaaj Zouari Amel; Belhassen Malika; Niquil Nathalie; Sakka Hlaili Asma (Ocean Science Journal, 2023)
We assessed the spatial variability in the size structure of phytoplankton, community composition, primary production and carbon fluxes through the planktonic food web of the Gulf of Gabès (GG; Southeastern Mediterranean Sea) in the fall of 2017 during the MERMEX-MERITE cruise. High concentrations in nutrients, chlorophyll a (~ 2–6 μg L −1 ) and primary production (1816–3674 mg C m −2 d −1 ) revealed an eutrophic status of the studied stations in the GG. In accordance with hydrodynamic features, inorganic nutrients showed increases in concentrations from North to South and from coast to off- shore, these nutrient gradients impacting the spatial distribution of phytoplankton community. Size-fractioned phytoplankton biomass and production were the lowest in the northernmost zone where they were mainly sustained by pico-sized fraction. Concomitantly, in this area, small aloricate ciliates were dominant leading to a high microbivory. Conversely, higher biomass and production were measured towards the South and offshore with prevalence of larger phytoplankton (nano- and/or micro- sized fractions) supported by diatoms. The herbivorous protozooplankton and metazooplankton were more abundant in these zones, resulting in an increase of the herbivory. The vertical particulate organic carbon flux followed also a north–south and coast-offshore increasing gradient, with a higher contribution of phytoplankton, and zooplankton fecal pellets to the sink- ing organic matter in the southernmost area. Our results suggest that even in nutrient-rich and highly productive waters, a continuum of trophic pathways, ranging from microbial to multivorous and herbivorous food webs, may exist, which implies different efficiencies in carbon export and carrying capacity within the ecosystem.
Keywords: Phytoplankton size-structure · Primary production · Zooplankton grazing · Planktonic food web · Mediterranean gulf

An integrated conceptual model to characterize the effects of offshore wind farms on ecosystem services - Baulaz, Yoann; Mouchet, Maud; Nathalie Niquil; Ben Rais Lasram, Frida (Ecosystem Services, 2023)

Isotopic niches of diadromous fishes inform on interspecific competition in an obstructed catchment - Lizé, Anne; Teichert, Nils; Roussel, Jean-Marc; Acou, Anthony; Feunteun, Eric; Carpentier, Alexandre (Frontiers in Ecology and Evolution, 2023)
Competition arises when species share a limited resource, but this can be avoided through niche partitioning. Despite the large body of literature on diadromous fishes, very few studies have focused on niche partitioning when competing for resources. Diadromous fishes are suffering a global decline throughout their range in part due to their peculiar life history traits as they migrate from the sea to freshwater to spawn or the reverse. They are particularly sensitive to river fragmentation induced by barriers. Dams for instance are expected to alter the spatial distribution and resource exploitation of diadromous fishes as well as other organisms. Here, we studied the ecological niche of six taxa of diadromous fishes, temporally co-occurring in the same land–sea continuum obstructed by two river dams. We used Bayesian mixing models run on C and N isotopes to infer the various habitats used and the origin of the trophic carbon in muscle and scale tissues of diadromous fishes. Results showed that the sub-adults of Anguilla anguilla, juveniles of Petromyzon marinus, and Salmo trutta exploit mainly the freshwater, or marine part for adults of Lampetra fluviatilis, whereas juveniles of Platichthys flesus and Mugilidae use all the habitats of the land–sea continuum. In the freshwater habitat, the microphytobenthos and biofilm are the main sources of carbon used, while in the marine habitat, the basal carbon sources are more diverse. The analyses of niche overlaps between diadromous fishes demonstrate that the widest isotopic niches, observed for A. anguilla and P. flesus, also have more impact within the community. Results are discussed in terms of intra- and interspecific competition between these diadromous fishes and their generalist/specialist strategies in an obstructed catchment.

Key issues in assessing threats to sea turtles: knowledge gaps and future directions - Fuentes, MMPB; McMichael, E; Kot, CY; Silver-Gorges, I; Wallace, BP; Godley, BJ; Brooks, AML; Ceriani, SA; Cortés-Gómez, AA; Dawson, TM; Dodge, KL; Flint, M; et al. (Endangered Species Research, 2023)

Local Food Systems under Global Influence: The Case of Food, Health and Environment in Five Socio-Ecosystems - Rapinski, Michael; Raymond, Richard; Davy, Damien; Herrmann, Thora; Bedell, Jean-Philippe; Ka, Abdou; Odonne, Guillaume; Chanteloup, Laine; Pascal Jean Lopez; Foulquier, Eric; da Silva, Eduardo Ferreira; El Deghel, Nathalie; et al. (Sustainability, 2023)

Local scale high frequency monitoring of seaweed strandings along an intertidal shore of the English Channel (Luc-sur-Mer, Normandy France) – Effect of biotic and abiotic factors - Stéphanie Lemesle; Anne-Marie Rusig; Isabelle Mussio (Aquatic Botany, 2023)

m6A Profile Dynamics Indicates Regulation of Oyster Development by m6A-RNA Epitranscriptomes - Le Franc, Lorane; Petton, Bruno; Favrel, Pascal; Guillaume Rivière (Genomics, Proteomics & Bioinformatics, 2023)

Major declines in NE Atlantic plankton contrast with more stable populations in the rapidly warming North Sea - Holland, Matthew M.; Louchart, Arnaud; Artigas, Luis Felipe; Ostle, Clare; Atkinson, Angus; Rombouts, Isabelle; Graves, Carolyn A.; Devlin, Michelle; Heyden, Birgit; Machairopoulou, Margarita; Bresnan, Eileen; Schilder, Jos; et al. (Science of The Total Environment, 2023)
Plankton form the base of marine food webs, making them important indicators of ecosystem status. Changes in the abundance of plankton functional groups, or lifeforms, can affect higher trophic levels and can indicate important shifts in ecosystem functioning. Here, we extend this knowledge by combining data from Continuous Plankton Recorder and fixed-point stations to provide the most comprehensive analysis of plankton time-series for the North-East Atlantic and North-West European shelf to date. We analysed 24 phytoplankton and zooplankton datasets from 15 research institutions to map 60-year abundance trends for 8 planktonic lifeforms. Most lifeforms decreased in abundance (e.g. dinoflagellates: −5 %, holoplankton: −7 % decade−1), except for meroplankton, which increased 12 % decade−1, reflecting widespread changes in large-scale and localised processes. K-means clustering of assessment units according to abundance trends revealed largely opposing trend direction between shelf and oceanic regions for most lifeforms, with North Sea areas characterised by increasing coastal abundance, while abundance decreased in North-East Atlantic areas. Individual taxa comprising each phytoplankton lifeform exhibited similar abundance trends, whereas taxa grouped within zooplankton lifeforms were more variable. These regional contrasts are counterintuitive, since the North Sea which has undergone major warming, changes in nutrients, and past fisheries perturbation has changed far less, from phytoplankton to fish larvae, as compared to the more slowly warming North-East Atlantic with lower nutrient supply and fishing pressure. This more remote oceanic region has shown a major and worrying decline in the traditional food web. Although the causal mechanisms remain unclear, declining abundance of key planktonic lifeforms in the North-East Atlantic, including diatoms and copepods, are a cause of major concern for the future of food webs and should provide a red flag to politicians and policymakers about the prioritisation of future management and adaptation measures required to ensure future sustainable use of the marine ecosystem.

Marine invertebrates and noise - Solé, Marta; Kaifu, Kenzo; Mooney, T. Aran; Nedelec, Sophie L.; Frédéric Olivier; Radford, Andrew N.; Vazzana, Mirella; Wale, Matthew A.; Semmens, Jayson M.; Simpson, Stephen D.; Buscaino, Giuseppa; Hawkins, Anthony; et al. (Frontiers in Marine Science, 2023)
Within the set of risk factors that compromise the conservation of marine biodiversity, one of the least understood concerns is the noise produced by human operations at sea and from land. Many aspects of how noise and other forms of energy may impact the natural balance of the oceans are still unstudied. Substantial attention has been devoted in the last decades to determine the sensitivity to noise of marine mammals—especially cetaceans and pinnipeds— and fish because they are known to possess hearing organs. Recent studies have revealed that a wide diversity of invertebrates are also sensitive to sounds, especially via sensory organs whose original function is to allow maintaining equilibrium in the water column and to sense gravity. Marine invertebrates not only represent the largest proportion of marine biomass and are indicators of ocean health but many species also have important socio-economic values. This review presents the current scientific knowledge on invertebrate bioacoustics (sound production, reception, sensitivity), as well as on how marine invertebrates are affected by anthropogenic noises. It also critically revisits the literature to identify gaps that will frame future research investigating the tolerance to noise of marine ecosystems.
Keywords: marine invertebrates; marine noise pollution; noise effects; particle motion; sound detection; sound pressure; sound production; statocyst

Marine pollution between gyres: plastic debris in marine turtles and dolphins in French Guiana, Equatorial Atlantic - Flore Emmonot; Blandine Siegrist; Amandine Bordin; Virginie Dos Reis; Chevallier, Damien; Yannick Estevez; Benoit de Thoisy (Latin American Journal of Aquatic Research, 2023)
Plastic pollution has not raised much attention until the 2000s, despite being manufactured for about a century. It is now considered one of the most substantial environmental issues. Here we investigate the presence of plastic contamination in 34 stranded animals on the coast of French Guiana, South America. Here we present information highlighting the magnitude of plastic contamination in marine coastal and pelagic tropical marine vertebrates on the Equatorial Atlantic coast of South America. All four species studied here are protected and emblematic vertebrates of the region, with a fragile conservation status, including the olive ridley turtle Lepidochelys olivacea, the green turtle Chelonia mydas and the leatherback turtle Dermochelys coriacea, and a small cetacean, the Guiana dolphin Sotalia guianensis. Macroplastics (polypropylene, polyethylene, terephthalate, and polystyrene) were detected in four juvenile green turtles. Microplastics (polypropylene, polyethylene, terephthalate, polystyrene, nylon, acrylates, polycarbonates) were found in 13 individuals (two dolphins, six olive ridleys, four green turtles, and the leatherback turtle). The sampled species have different diets, distribution patterns, and ages, suggesting widespread plastic pollution. The study area is located far from the oceanic gyres. However, they are influenced by the North Brazilian Current, the Amazon River, and other rivers of the Guianas.
Keywords: Chelonia; Dermochelys; Lepidochelys; macroplastics; microplastics; Sotalia

Modelling species distribution, ecosystem structure and function and climate change - Saint-Béat, Blanche; Nogues, Quentin; Nathalie Niquil; Bourdaud, Pierre; Virginie Raybaud; Goberville, Eric; Grégory Beaugrand; Ben Rais Lasram, Frida; Le Loc’h, François; Schickele, Alexandre (Elsevier, 2023)
In recent decades, oceans have been increasingly stressed by human activities that induced significant changes in its abiotic properties. Temperature increase, acidification, deoxygenation, deregulation of ocean currents are some examples of the anthropogenic impact on our oceans. In addition, pollution and overexploitation of marine resources will lead to severe and possibly irreversible changes for marine life. As environmental conditions directly affect the physiology of species, changes in species distribution and trophic interactions have already been observed and are expected to increase in the near future. Predicting future oceans is currently a great challenge for scientists that work to maintain, as best as possible, the goods and services they provide. In this context, ecologists have developed several modeling approaches able to simulate changes in both species distribution (Ecological Niche Models – ENMs) and interactions (static and dynamic food-web models). This chapter explains these two approaches in detail as well as the ways by which these two families of models can be coupled. In each part, the main existing algorithms will be reviewed, with their advantages and limitations, and some key examples retrieved from recent scientific literature will be presented. Finally, we will discuss the current issues of these methods and their potential improvement.

Molecular and phenotypic effects of early exposure to an environmentally relevant pesticide mixture in the Pacific oyster, Crassostrea gigas. - Sol-Dourdin, Thomas; Guillaume Rivière; Cormier, Alexandre; Di Poi, Carole; Guyomard, Killian; Rabiller, Manuella; Akcha, Farida; Bah Sadialiou, Thierno; Le Monier, Pauline; Sussarellu, Rossana (Environmental Pollution, 2023)

Molecular ecology of the freshwater shrimp Caridina natalensis and comparative analysis with other amphidromous species (Decapoda, Teleostei, and Gastropoda) - de Mazancourt, Valentin; Ahmed Abdou; Castelin, Magalie; Ellien, Céline; Clara Lord; Marion Mennesson; Renneville, Clémentine; Marquet, Gérard; Philippe Keith (Hydrobiologia, 2023)
Due to their life cycle shared between rivers and oceans, amphidromous organisms serve as intriguing models for studying biogeography. To investigate the implications of their unique life history, we examined the population structure of the amphidromous shrimp Caridina natalensis across its known range in the South Western Indian Ocean. A total of 118 specimens were collected from 7 islands (Mayotte, Mohéli, Mahé, Praslin, Silhouette, Mauritius and Madagascar) and the African mainland (South Africa), and their 16S rRNA and Cox1 mitochondrial genes were sequenced. Our findings reveal significant regional structure among archipelagos, suggesting complex patterns of dispersal involving successive events of extinction-recolonization. By conducting a comparative analysis with six other amphidromous species from the South Western Indian Ocean, based on literature sources, we were able to draw conclusions regarding the amphidromous biogeography of the area. Furthermore, we propose a novel classification of amphidromous species, considering their population structure and life history traits. We defined four categories of increasing dispersal abilities and decreasing genetic population structure: 1. Land-locked species; 2. Species with reduced or facultative amphidromy; 3. Species with common amphidromy; and 4. Super-amphidromous species. Lastly, we identified the Comoros Islands (namely Mayotte and Mohéli) as a critical area for the dispersal of amphidromous species, emphasizing the need for prioritizing conservation efforts in this region.

Nanopore long-reads reveal fine structure of prokaryotic communities in mangrove sediments, like Illumina short-reads but with twice more taxa - Alice Lemoinne; Guillaume Dirberg; Myriam Georges; Tony Robinet (bioRxiv, 2023)

The Neglected Role of Intraspecific Variation in Plastic Pollution Research - Nicastro, Katy R.; Seuront, Laurent; Lorenzo Cozzolino; Zardi, Gerardo I. (Anthropocene Science, 2023)

New insights into the diversity of cryptobenthic Cirripectes blennies in the Mascarene Archipelago sampled using Autonomous Reef Monitoring Structures (ARMS) - Marion Couëdel; Dettai, Agnès; Mireille M.M. Guillaume; Bruggemann, Fleur; Bureau, Sophie; Baptiste Frattini; Verde Ferreira, Amélie; Azie, Jean‐Lindsay; Bruggemann, J. Henrich (Ecology and Evolution, 2023)

New species of Pavlovophyceae (Haptophyta) and revision of the genera Exanthemachrysis, Rebecca and Pavlova - Benoît Véron; Rougier, Etienne; Taylor, Anthony; Goux, Didier (European Journal of Taxonomy, 2023)
The justification of the 4 genera that currently compose the class Pavlovophyceae is based on a low number of species and a relative paucity of available, traceable and referenced cultures. Previous integrative phylogeny work revealed strains that can refine and strengthen our knowledge of the genera in the class. The application of multiple light and electron microscopy techniques allowed us to prioritize the cytomorphological characters (pyrenoid, thylakoid, stigma, knob-scales, life stage / life cycle) used for the taxonomy of these algae and to describe two new species: Exanthemachrysis fresneliae Véron sp. nov. and Rebecca billardiae Véron sp. nov. Consequently, revisions of the two genera Exanthemachrysis Lepailleur emend. Véron and Rebecca Green emend. Véron were made. In addition, the genus Pavlova Butcher emend Véron is revised in the light of these characters. Particular emphasis is placed on the life stages and habitat of the species.
Keywords: habitats; Haptophytes; New species; Phytoplankton; pyrenoid.

Note technique : Estimation de l'abondance du zooplancton gélatineux à partir de traits de chaluts - Lheureux, Arnaud; Vaz, Sandrine; Antajan, Elvire; Vincent, Dorothée; Lombard, Fabien; Goberville, Eric; Sacchi, Jacques; Morandeau, Fabien (2023)
Keywords: campagnes optimisées DCSMM; chalut; zooplancton gélatineux

Pesticide upsurge, cross-contamination and biodiversity: case studies from the Caribbean Coast Human-Environment Observatory - Hervé, Vincent; Sabatier, Pierre; Lambourdière, Josie; Raymond, Richard; Foulquier, Eric; Le Berre, Iwan; Pascal Jean Lopez (Comptes Rendus. Géoscience, 2023)

Physiological condition of the warty venus (Venus verrucosa L. 1758) larvae modulates response to pile driving and drilling underwater sounds - Gigot, Mathilde; Tremblay, Rejean; Bonnel, Julien; Chauvaud, Laurent; Frédéric Olivier (Frontiers in Marine Science, 2023)
Noise is now recognized as a new form of pollution in marine coastal habitats. The development of marine renewable energies has introduced new sonorous perturbations, as the wind farm installation requires pile driving and drilling operations producing low frequency sounds at high sound pressure levels. Exponential expansion of offshore wind farms is occurring worldwide, making impact studies, particularly on benthic species highly abundant and diverse in the coastal area used for wind farming, a necessity. As larval recruitment is the basis for establishing a population, we conducted an experimental study to assess the interactive effects of pile driving or drilling sounds and larval rearing temperature on the endobenthic bivalve Venus verrucosa. In ectothermic animals, temperature modifies the organism’s physiology, resulting in performance variability. We hypothesize that temperature modulation could change larval responses to noise and explore the potential interacting effects of temperature and noise. Using two distinct rearing temperatures, physiologically different batches of larvae were produced with contrasting fatty acid content and composition in the neutral and polar lipid fractions. Without defining any absolute audition threshold for the larvae, we demonstrate that the effects of temperature and noise were ontogenic-dependent and modulated larval performance at the peri-metamorphic stage, acting on the metamorphosis dynamic. At the pediveligers stage, a strong interaction between both factors indicated that the response to noise was highly related to the physiological condition of the larvae. Finally, we suggest that underwater noise reduces the compensatory mechanisms established to balance the temperature increase.
Keywords: Anthropophony; energetic metabolism; fatty acids; larval recruitment; Metamorphosis trigger

Physiological conditions favorable to domoic acid production by three Pseudo-nitzschia species - Aurore Sauvey; Pascal Claquin; Le Roy, Bertrand; Jolly, Orianne; Juliette Fauchot (Journal of Experimental Marine Biology and Ecology, 2023)

Pile driving and drilling underwater sounds impact the metamorphosis dynamics of Pecten maximus (L., 1758) larvae - Gigot, Mathilde; Frédéric Olivier; Cervello, Gauthier; Tremblay, Rejean; Mathias, Delphine; Meziane, Tarik; Chauvaud, Laurent; Bonnel, Julien (Marine Pollution Bulletin, 2023)
One of the biggest challenges of the 21st century is to reduce carbon emissions and offshore wind turbines seem to be an efficient solution. However, during the installation phase, high levels of noise are emitted whose impacts remain not well known, particularly on benthic marine invertebrates displaying a bentho-planktonic life-cycle. For one century, larval settlement and subsequent recruitment has been considered as a key topic in ecology as it determines largely population renewal. Whereas several recent studies have shown that trophic pelagic but also natural soundscape cues could trigger bivalve settlement, the role of anthropogenic noise remains poorly documented. Therefore, we conducted experiments to assess potential interacting effects of diet and pile driving or drilling sounds on the great scallop (Pecten maximus) larval settlement. We demonstrate here that pile driving noise stimulates both growth and metamorphosis as well as it increases the total lipid content of competent larvae. Conversely, drilling noise reduces both survival and metamorphosis rates. For the first time, we provide evidence of noise impacts associated to MREs installation on P. maximus larvae and discuss about potential consequences on their recruitment.
Keywords: Anthropophony; larval settlement; Metamorphosis trigger; Pecten maximus; recruitment; Wind turbine

Recruitment dynamics of Hiatella arctica within a high Arctic site (Young Sound Fjord, NE Greenland) - Veillard, Delphine; Tremblay, Rejean; Sejr, Mikael K.; Chauvaud, Laurent; Cam, Emmanuelle; Frédéric Olivier (Polar Biology, 2023)
Recruitment dynamics including what determines the success or failure of Arctic benthic invertebrates are poorly known despite their important role for population dynamics. The main objective of this study was to assess the potential influence of extreme physical constraints related to freshwater discharge on the recruitment of a dominant bivalve Hiatella arctica within a High Arctic fjord (Young Sound, NE Greenland). We collected young recruits over several sampling periods from 2016 to 2018 at two contrasting sites (inner vs. middle fjord) for 5-weeks to 12-months and measured their abundance, size at metamorphosis and lipid class composition. Young stages of H. arctica settled from June to the end of October, when trophic conditions are optimal. We hypothesize that growth stops during winter due to poor trophic conditions. Data suggest that abundance of recruits, their total lipid concentration and composition of lipid classes are similar at both sites. However, size classes were different with six separate cohorts detected at one station and one at the inner station, which may be attributed to discrete spawning events and possible secondary migration. Based on an assessment of their potential age, we hypothesize that spat batches recruiting earlier in the summer exhibit better growth performance probably related to better food quality and quantity.
Keywords: Arctic; Bivalve recruitment; Lipids classes; prodissoconch II

Revision of Hypseleotris (Teleostei: Eleotridae) from Indo-Pacific Islands using molecular and morphometric approaches, with description of one new species - Philippe Keith; Marion Mennesson (Zoological Journal of the Linnean Society, 2023)

Seasonal lipid dynamics of four Arctic bivalves: Implications for their physiological capacities to cope with future changes in coastal ecosystemsAbstract - Bridier, Guillaume; Frédéric Olivier; Grall, Jacques; Chauvaud, Laurent; Sejr, Mikael K.; Tremblay, Rejean (Ecology and Evolution, 2023)
The Arctic is exposed to unprecedented warming, at least three times higher than the global average, which induces significant melting of the cryosphere. Freshwater inputs from melting glaciers will subsequently affect coastal primary production and organic matter quality. However, due to a lack of basic knowledge on the physiology of Arctic organisms, it remains difficult to understand how these future trophic changes will threaten the long-term survival of benthic species in coastal habitats. This study aimed to gain new insights into the seasonal lipid dynamics of four dominant benthic bivalves (Astarte moerchi, Hiatella arctica, Musculus discors, and Mya truncata) collected before and after sea ice break-up in a high-Arctic fjord (Young Sound, NE Greenland). Total lipid content and fatty acid composition of digestive gland neutral lipids were analyzed to assess bivalve energy reserves while the fatty acid composition of gill polar lipids was determined as a biochemical indicator of interspecies variations in metabolic activity and temperature acclimation. Results showed a decrease in lipid reserves between May and August, suggesting that bivalves have only limited access to fresh organic matter until sea ice break-up. The lack of seasonal variation in the fatty acid composition of neutral lipids, especially essential ω3 fatty acids, indicates that no fatty acid transfer from the digestive glands to the gonads occurs between May and August, and therefore, no reproductive investment takes place during this period. Large interspecies differences in gill fatty acid composition were observed, which appear to be related to differences in species life span and metabolic strategies. Such differences in gill fatty acid composition of polar lipids, which generally influence metabolic rates and energy needs, may imply that not all benthic species will be equally sensitive to future changes in primary production and organic matter quality in Arctic coastal habitats.
Keywords: Arctic coastal ecosystems; Bivalve; Climate Change; energy reserves; fatty acids; homeoviscous adaptation; meltwater inputs; metabolic rate depression

Sex-specific seasonal variations in the fatty acid and carotenoid composition of sea cucumber gonads and implications for aquaculture - Frank David; Herault, Gwen; Ameziane, Nadia; Tarik Meziane; Badou, Aicha; Cédric Hubas (Marine Biology, 2023)

Size-dependent response of the mussel collective behaviour to plastic leachates and predator cues - Marine Uguen; Sylvie M Gaudron; Nicastro, Katy R.; Zardi, Gerardo I.; Nicolas Spilmont; Seuront, Laurent (Science of The Total Environment, 2023)

Socio-political acceptability of floating offshore wind farms in France: challenges and perspectives for marine governance towards sustainability - Fofack-Garcia, Rhoda; Mazé, Camille; Safi, Georges; Lejart, Morgane; Chauvac, Nathalie; Thermes, Maud; Ragueneau, Olivier; Le Loc'h, Francois; Nathalie Niquil (Ocean & Coastal Management, 2023)

Spatial and temporal variability of common cuttlefish, Sepia officinalis, L. spawning grounds off North Europe - Laptikhovsky, Vladimir; Cooke, Gavan; Drerup, Christian; Jackson, Angus; MacLeod, Eleanor; Jean-Paul Robin (Fisheries Research, 2023)
Spatial and temporal dynamics of common cuttlefish, Sepia officinalis, spawning at north European shores was studied using data collected by the Cephalopod Citizen Science Project, Seasearch between 1995 and 2021 and a range of other internet sources for the same period. Reproduction begins in the western English Channel in March and gradually progresses eastward following water warming, attaining the Netherlands in May, when peripheral spawning grounds expand north to Norfolk and the Irish Sea. Despite a thermal regime favourable for egg development existing around the UK and Ireland, spawning is normally restricted to the English Channel and southernmost North Sea with egg masses occasionally observed as far north as Isle of Man and Norfolk.

Spatio-temporal distribution of juvenile fish species in Guadeloupean reefs (Lesser Antilles) - Vignaud, Léa; Vallès, Henri; Cordonnier, Sébastien; Chatagnon, Amélia; Lecchini, David; Charlotte R. Dromard (Regional Studies in Marine Science, 2023)

Spatiotemporal variations of Chlamys islandica larval shell morphometry between 2000 and 2018 in a depleted coastal scallop fishing area - Poitevin, Pierre; Roy, Virginie; Cervello, Gauthier; Frédéric Olivier; Tremblay, Rejean (Estuarine, Coastal and Shelf Science, 2023)
Keywords: Chlamys islandica; Icelandic scallop; larval morphometry; prodissoconch; recruitment

Structural and functional characterization of an egg-laying hormone signaling system in a lophotrochozoan - The pacific oyster (Crassostrea gigas). - Favrel, P; Dubos, M P; Bernay, B; Pasquier, J; Schwartz, J; Lefranc, B; Mouret, L; Rivière, G; Leprince, J; Bondon, A (Gen Comp Endocrinol, 2023)
The egg-laying hormones (ELHs) of gastropod mollusks were characterized more than forty years ago. Yet, they have remained little explored in other mollusks. To gain insights into the functionality of the ELH signaling system in a bivalve mollusk - the oyster Crassostrea gigas, this study investigates the processing of its ELH precursor (Cragi-ELH) by mass spectrometry. Some of the ELH mature peptides identified in this study were subsequently investigated by nuclear magnetic resonance and shown to adopt an extended alpha-helix structure in a micellar medium mimicking the plasma membrane. To further characterize the ELH signaling system in C. gigas, a G protein-coupled receptor phylogenetically related to ecdysozoan diuretic hormone DH44 and corticotropin-releasing hormone (CRH) receptors named Cragi-ELHR was also characterized functionally and shown to be specifically activated by the two predicted mature ELH peptides and their N-terminal fragments. Both Cragi-ELH and Cragi-ELHR encoding genes were mostly expressed in the visceral ganglia (VG). Cragi-ELH expression was significantly increased in the VG of both fully mature male and female oysters at the spawning stage. When the oysters were submitted to a nutritional or hyposaline stress, no change in the expression of the ligand or receptor genes was recorded, except for Cragi-ELHR only during a mild acclimation episode to brackish water. These results suggest a role of Cragi-ELH signaling in the regulation of reproduction but not in mediating the stress response in our experimental conditions.

Structure of planktonic food web in the Gulf of Gabès (Southeastern Mediterranean): potential importance of heterotrophic and mixotrophic microzooplankton - Mejri Kousri, Kaouther; Belaaj Zouari, Amel; Meddeb, Marouan; Chkili, Oumayma; Nathalie Niquil; Tedetti, Marc; Pagano, Marc; Sammari, Cherif; Khammeri, Yosra; Bel Hassen, Malika; Sakka Hlaili, Asma (Aquatic Sciences, 2023)

Symbiont-induced phenotypic variation in an ecosystem engineer mediates thermal stress for the associated community - Zardi, Gerardo I.; Seuront, Laurent; Christopher D. McQuaid; Pierre William Froneman; Nicastro, Katy R. (Journal of Thermal Biology, 2023)

Temporal pesticide dynamics alter specific eukaryotic taxa in a coastal transition zone - Hervé, Vincent; Sabatier, Pierre; Lambourdière, Josie; Poulenard, Jérôme; Pascal Jean Lopez (Science of The Total Environment, 2023)

Threatened fish species in the Northeast Atlantic are functionally rare - Coulon, Noémie; Lindegren, Martin; Goberville, Eric; Toussaint, Aurèle; Receveur, Aurore; Arnaud Auber (Global Ecology and Biogeography, 2023)
The criteria used to define the International Union for Conservation of Nature (IUCN) Red List categories are essentially based on demographic parameters at the species level, but they do not integrate species' traits or their roles in ecosystems. Consequently, current IUCN-based protection measures may not be sufficient to conserve ecosystem functioning and services. Some species may have a singular combination of traits associated with unique functions. Such functionally distinct species are increasingly recognized as a key facet of biodiversity since they are, by definition, functionally irreplaceable. The aim of this study is to investigate whether threatened species are also functionally rare and to identify which traits determine extinction risk.

Trace elements in bivalve shells: How “vital effects” can bias environmental studies - Barrat, Jean-Alix; Chauvaud, Laurent; Frédéric Olivier; Poitevin, Pierre; Rouget, Marie-Laure (Chemical Geology, 2023)
We report on the concentrations of rare earths (REE), Y, Mg, Mn, Cu, Zn, Sr, Ba, Pb and U in a series of wild scallops (Placopecten magellanicus) collected alive on the same day in Saint Pierre et Miquelon (a French archipelago located south of Newfoundland) and ranging in age from 2 to about 20 years. We analyzed representative fragments from the entire last annual shell growth increment of each animal to assess changes in trace element incorporation with age. No correlation with the age of the animals was obtained for Sr and Mn concentrations, which are quite variable from one individual to another, even of similar age. On the other hand, for REE, Y, Cu, Zn, Ba and U, the concentrations measured in the last annual growth increment formed by animals aged 2 to 7 years are similar. From 8 years of age, the concentrations of these elements increased very strongly (for example for Yb, almost by an order of magnitude between 8 and 20 years of age), and possibly with some variation between individuals of the same age. Two elements show a different behavior: Mg concentrations in the shell margins increase continuously with the age of the animals; Pb concentrations are scattered but seem to decrease with the age of the animals.This turning point in the behavior of the elements from 8 years of age coincides with major metabolic changes, since at this age wild P. magellanicus from Newfoundland reduce their growth, in favor of gamete production. Our results demonstrate that metabolic activity of the animals largely controls the incorporation of many trace elements into the shells. These results demonstrate that the age of the animals must be taken into account when their shells are used to study pollution or (paleo)

Transcriptome wide analyses reveal intraspecific diversity in thermal stress responses of a dominant habitat‐forming species - Nicastro, Katy R.; Pearson, G.A.; Ramos, X.; Vasco Pearson; Christopher Mc Quaid; Zardi, Gerardo I. (Scientific Reports, 2023)

Unmasking pipefish otolith using synchrotron-based scanning X-ray fluorescenceAbstract - Haÿ, Vincent; Berland, Sophie; Medjoubi, Kadda; Somogyi, Andrea; Mennesson, Marion I.; Philippe Keith; Lord, Clara (Scientific Reports, 2023)

Unmasking pipefish otolith using synchrotron-based scanning X-ray fluorescenceAbstract - Haÿ, Vincent; Berland, Sophie; Medjoubi, Kadda; Somogyi, Andrea; Mennesson, Marion I.; Keith, Philippe; Lord, Clara (Scientific Reports, 2023)

Updated Checklist of the Freshwater Shrimps (Decapoda: Caridea: Atyidae) of Mindoro Island, the Philippines, with a Description of a New Species of Caridina - de Mazancourt, Valentin; Freitag, Hendrik; von Rintelen, Kristina; Manuel-Santos, Marivene; von Rintelen, Thomas (Arthropoda, 2023)

The usefulness of food web models in the ecosystem services framework: Quantifying, mapping, and linking services supply - Nogues, Quentin; Baulaz, Yoann; Clavel, Joanne; Araignous, Emma; Bourdaud, Pierre; Ben Rais Lasram, Frida; Dauvin, Jean-Claude; Girardin, Valerie; Halouani, Ghassen; Le Loc'h, Francois; Loew-Turbout, Frédérique; Raoux, Aurore; et al. (Ecosystem Services, 2023)

What are the toxicity thresholds of chemical pollutants for tropical reef-building corals? A systematic review - Ouédraogo, Dakis-Yaoba; Mell, Hugo; Perceval, Olivier; Burga, Karen; Domart-Coulon, Isabelle; Hédouin, Laetitia; Delaunay, Mathilde; Mireille M.M. Guillaume; Castelin, Magalie; Calvayrac, Christophe; Kerkhof, Odile; Sordello, Romain; et al. (Environmental Evidence, 2023)

Why several when one can unite them all? Integrative taxonomic revision of Indo-Pacific freshwater pipefish (Nerophinae)Abstract - Vincent Haÿ; Marion Mennesson; Clara Lord; Philippe Keith (Zoological Journal of the Linnean Society, 2023)

Widespread formation of intracellular calcium carbonates by the bloom‐forming cyanobacterium Abstract - Gaëtan, Juliette; Halary, Sébastien; Millet, Maxime; Bernard, Cécile; Duval, Charlotte; Sahima Hamlaoui; Hecquet, Amandine; Gugger, Muriel; Marie, Benjamin; Mehta, Neha; Moreira, David; Skouri‐Panet, Fériel; et al. (Environmental Microbiology, 2023)

Additional records of Sicyopus discordipinnis (Watson, 1995) (Oxudercidae: Sicydiinae) in Central Sulawesi, Indonesia. - Nurjirana; Burhanuddin, A I; Philippe Keith; Haris, A (Cybium, 2022)

Analysing economic costs of invasive alien species with the invacost R package - Leroy, Boris; Kramer, Andrew M.; Vaissière, Anne‐Charlotte; Kourantidou, Melina; Courchamp, Franck; Diagne, Christophe (Methods in Ecology and Evolution, 2022)

Anthropogenic Contaminants Shape the Fitness of the Endangered European Eel: A Machine Learning Approach - Bourillon, Bastien; Feunteun, Eric; Acou, Anthony; Trancart, Thomas; Teichert, Nils; Belpaire, Claude; Dufour, Sylvie; Bustamante, Paco; Aarestrup, Kim; Walker, Alan; Righton, David (Fishes, 2022)
European eel is thought to be a symbol of the effects of global change on aquatic biodiversity. The species has persisted for millions of years and faced drastic environmental fluctuations thanks to its phenotypic plasticity. However, the species has recently declined to historically low levels under synergistic human pressures. Sublethal chemical contamination has been shown to alter reproductive capacity, but the impacts and required actions are not fully addressed by conservation plans. This paper proposes a modelling approach to quantify the effects of sublethal contamination by anthropogenic pollutants on the expression of life history traits and related fitness of the critically endangered European eel. Material and Methods: We sampled female silver eels from eight different catchments across Europe previously shown to be representative of the spectrum of environmental variability and contamination. We measured 11 fitness-related life history traits within four main categories: fecundity, adaptability and plasticity, migratory readiness, and spawning potential. We used machine learning in models to explore the phenotypic reaction (expression of these life history traits) according to geographical parameters, parasite burdens (the introduced nematode Anguillicoloides crassus) and anthropogenic contaminants (persistent organic pollutants (POPs) in muscular tissue and trace elements (TEs) in gonads, livers and muscles). Finally, we simulated, the effects of two management scenarios—contamination reduction and contamination increase—on the fecundity and recruitment. Results: Contamination in our sampling was shown to have a stronger control on life history traits than do geographic and environmental factors that are currently described in the literature. We modelled different contamination scenarios to assess the benefit of mitigation: these scenarios suggest that reducing pollutants concentrations to the lowest values that occurred in our sampling design would double the fecundity of eels compared to the current situation. Discussion: Remediation of contamination could represent a viable management option for increasing the resilience of eel populations, with much more effects than solely reducing fishing mortality. More broadly, our work provides an innovative way for quantitative assessment of the reaction norms of species’ biological traits and related fecundity to contamination by organic and inorganic pollutions thus opening new management and conservation pathways to revert the erosion of biodiversity.

Arsenic and chlordecone contamination and decontamination toxicokinetics in Sargassum sp. - Devault, Damien A.; Massat, Félix; Baylet, Alexandre; Dolique, Franck; Pascal Jean Lopez (Environmental Science and Pollution Research, 2022)

Assessing the state of marine biodiversity in the Northeast Atlantic - McQuatters-Gollop, A.; Guérin, L.; Arroyo, N.L.; Aubert, A.; Artigas, L.F.; Bedford, J.; Corcoran, E.; Dierschke, V.; Elliott, S.A.M.; Geelhoed, S.C.V.; Gilles, A.; González-Irusta, J.M.; et al. (Ecological Indicators, 2022)

Bi-decadal changes in nutrient concentrations and ratios in marine coastal ecosystems: The case of the Arcachon bay, France - Lheureux, A.; David, V.; Del Amo, Y.; Soudant, D.; Auby, I.; Ganthy, F.; Blanchet, H.; Cordier, M-A.; Costes, L.; Ferreira, S.; Mornet, L.; Nowaczyk, A.; et al. (Progress in Oceanography, 2022)

Big data approaches to the spatial ecology and conservation of marine megafauna - Grémillet, David; Chevallier, Damien; Guinet, Christophe (ICES Journal of Marine Science, 2022)

Biologging of emperor penguins – attachment techniques and associated deployment performance - Houstin, Aymeric; Zitterbart, Daniel; Winterl, Alexander; Richter, Sebastian; Planas-Bielsa, Víctor; Chevallier, Damien; Ancel, André; Fournier, Jérôme; Fabry, Ben; Le Bohec, Céline (PLoS ONE, 2022)

Can artificial magnetic fields alter the functional role of the blue mussel, Mytilus edulis? - Albert, Luana; Maire, Olivier; Frédéric Olivier; Lambert, Christophe; Romero-Ramirez, Alicia; Jolivet, Aurélie; Chauvaud, Laurent; Chauvaud, Sylvain (Marine Biology, 2022)
Along European coasts, the rapid expansion of marine renewable energy devices and their buried power cables, raises major societal concerns regarding the potential effects of their magnetic field emissions (MFs) on marine species and ecosystem functioning. MFs occur at a local spatial scale, which makes sessile species the primary target of chronic and high-intensity exposures. Some of them, as ecosystem engineers, have critical functions in coastal habitats whose behavioral alteration may drive profound consequences at the ecosystem level. In this context, the present experimental study explored the effects of short exposure to direct current MFs, on the feeding behavior of a widespread ecosystem engineer, the blue mussel (Mytilus edulis). A repeated measure design was carried out with adult mussels successively exposed to control treatment (ambient magnetic field of 47 μT) and artificial MF treatment (direct current of 300 μT produced by Helmholtz coils), as measured around power cables. The filtration activity was assessed through valve gap monitoring using an automated image analysis system. The clearance rate was estimated simultaneously by measuring the decrease in algal concentration using flow cytometry. Our findings revealed that mussels placed in MF treatment did not exhibit observable differences in valve activity and filtration rate, thus suggesting that, at such an intensity, artificial MFs do not significantly impair their feeding behavior. However, additional research is required to investigate the sensitivity of other life stages, the effects of mid to long-term exposure to alternative and direct current fields and to test various MF intensities.
Keywords: Coastal environments; Ecosystem engineers; Filter-feeders; Magnetic fields; Mytilus edulis; Submarine power cables

Carbon dynamics driven by seawater recirculation and groundwater discharge along a forest-dune-beach continuum of a high-energy meso-macro-tidal sandy coast - Charbonnier, Céline; Anschutz, Pierre; Gwenaël Abril; Mucci, Alfonso; Deirmendjian, Loris; Poirier, Dominique; Bujan, Stéphane; Lecroart, Pascal (Geochimica et Cosmochimica Acta, 2022)

Careful amendment of morphological data sets improves phylogenetic frameworks: re-evaluating placement of the fossil Amiskwia sagittiformis - Bekkouche, Nicolas; Gąsiorowski, Ludwik (Journal of Systematic Palaeontology, 2022)

Cephalopod palaeobiology: evolution and life history of the most intelligent invertebratesAbstract - Klug, Christian; Laure Bonnaud-Ponticelli; Nabhitabhata, Jaruwat; Fuchs, Dirk; De Baets, Kenneth; Cheng, Ji; Hoffmann, René (Swiss Journal of Palaeontology, 2022)

Chapter 6 - Fishes and Estuarine Environmental Health - Cabral, Henrique N.; Borja, Angel; Fonseca, Vanessa F.; Harrison, Trevor D.; Teichert, Nils; Lepage, Mario; Leal, Miguel C. (Wiley, 2022)
This chapter addresses the use of fish as indicators of environmental health. The main anthropogenic pressures impacting estuarine fishes are reviewed, as well as the main types of responses by fishes at different levels of biological organisation. Fishes have been widely used to assess estuarine health through different methodological approaches, namely comparisons with historical data or reference conditions, experimental approaches, environmental impact or risk assessment methods, as well as qualitative or quantitative indicators and models. A large number of multi-metric indices based on fish have been proposed and are routinely used in environmental assessments, although to disentangle natural variability from anthropogenic pressures in a multi-stress context of global change is still a major challenge.

Characterisation of long-term evolution (1950–2016) and vulnerability of Mayotte’s shoreline using aerial photographs and a multidisciplinary vulnerability index - Courteille, Marine; Jeanson, Matthieu; Collin, Antoine; James, Dorothée; Claverie, Thomas; Charpentier, Michel; Gairin, Emma; René-Trouillefou, Malika; Giraud-Renard, Eléa; Franck Dolique; Lecchini, David (Regional Studies in Marine Science, 2022)

Chlordecone-contaminated epilithic biofilms show increased adsorption capacities - Cédric Hubas; Monti, Dominique; Jean-Michel Mortillaro; Augagneur, Sylvie; Carbon, Anne; Duran, Robert; Karama, Solange; Tarik Meziane; Pardon, Patrick; Risser, Théo; Tapie, Nathalie; Najet Thiney; et al. (Science of The Total Environment, 2022)

Classification of underwater photogrammetry data for temperate benthic rocky reef mapping - Ternon, Q.; Danet, V.; Thiriet, P.; Ysnel, F.; Eric Feunteun; Collin, A. (Estuarine, Coastal and Shelf Science, 2022)

Climate change influences chlorophylls and bacteriochlorophylls metabolism in hypersaline microbial mat - Mazière, C.; Bodo, M.; Perdrau, M.A.; Cravo-Laureau, C.; Duran, Robert; Christine Dupuy; Cédric Hubas (Science of The Total Environment, 2022)

CO2 and CH4 emissions from coastal wetland soils - Marchand, Cyril; Frank David; Jacotot, Adrien; Leopold, Audrey; Ouyang, Xiaoguang (Carbon Mineralization in Coastal Wetlands, 2022)

Coastal ocean acidification in Brazil: a brief overview and perspectives - Cotovicz Jr., Luiz C; Valente Marins, Rozane; Gwenaël Abril (Arquivos de Ciências do Mar, 2022)

Colimitation assessment of phytoplankton growth using a resource use efficiency approach in the Bay of Seine (French-English Channel) - Serre-Fredj, Léon; Chasselin, Léo; Jolly, Orianne; Jacqueline, Franck; Pascal Claquin (Journal of Environmental Management, 2022)

Colonisation of artificial structures by primary producers: competition and photosynthetic behaviour - Vivier, Baptiste; Navon, Maxime; Dauvin, Jean-Claude; Chasselin, Léo; Deloor, Maël; Orvain, Francis; Rusig, Anne-Marie; Mussio, Isabelle; Boutouil, Mohamed; Pascal Claquin (Biofouling, 2022)

Contrasting organic matter composition in pristine and eutrophicated mangroves revealed by fatty acids and stable isotopes (Rio de Janeiro, Brazil) - Chynel, Mathias; Rockomanovic, Sofia; Gwenaël Abril; Barroso, Glenda; Marotta, Humberto; Machado, Wilson; Sanders, Christian J.; Najet Thiney; Tarik Meziane (Estuarine, Coastal and Shelf Science, 2022)
Mangrove sediments have a high capacity of carbon storage, as the result of larger organic matter (OM) inputs from mangrove trees (litter fall and fine roots production) than OM microbial degradation and export to coastal waters. Mangrove sediments also act as traps for suspended matter and particulate OM (POM) from surrounding water masses. Fatty acids (FAs) markers, δ13C and δ15N signatures were used here to characterize the OM composition in three mangroves located in three coastal embayments of the Rio de Janeiro state (Brazil) with increasing urbanization from a pristine mangrove M1 to a moderately impacted mangrove M2 and a highly impacted mangrove M3. In these mangroves, the δ15N signature of tree leaves and sediments increases with anthropogenic influence, consistent with a large-scale eutrophication gradient along the three regions. At mangrove M1, predominant OM inputs from mangrove trees are highlighted by high proportions of long-chain fatty acids, particularly in the inland station, where high organic carbon concentrations (126 ± 108 mg g−1) indicate limited sedimentation of mineral particles and high carbon storage capacities. The sedimentary OM of M3 mangrove was more labile as confirmed by the higher proportions of algal fatty acids, enriched δ13C signature and the C/N ratio 1.6 times lower (p < 0.001) than in the pristine mangrove M1. At the M2 mangrove site, high contribution of bacterial FAs (around 20%) to sedimentary OM and high proportion of poorly biodegradable saturated fatty acids suggest that bacteria degrade algal labile OM in surface sediments but do not mineralize the most refractory fraction of OM. At the eutrophic M3 site, our findings suggest that deposition of labile POM induced an increase of fungal biomass on the sediment, apparently enhancing the microbial loop, and potentially leading to mineralization of refractory OM and carbon losses through a priming effect.

The Culture Collection of Cyanobacteria and Microalgae at the French National Museum of Natural History: A Century Old But Still Alive and Kicking! Including in Memoriam: Professor Alain Couté. Cryptogamie, Algologie 43 (3) – Appendix 3 - Sahima Hamlaoui; Yéprémian, Claude; Duval, Charlotte; Marie, Benjamin; Djediat, Chakib; Piquet, Bérénice; Bernard, Cécile; Duperron, Sébastien (Cryptogamie, Algologie, 2022)

Detection of the protistan parasite, Haplosporidium costale in Crassostrea gigas oysters from the French coast: A retrospective study - Cherif--Feildel, Maëva; Lagy, Coralie; Quesnelle, Yann; Bouras, Hélène; Trancart, Suzanne; Maryline Houssin (Journal of Invertebrate Pathology, 2022)

Dynamic evolution of transient receptor potential vanilloid (TRPV) ion channel family with numerous gene duplications and losses - Morini, Marina; Bergqvist, Christina A.; Asturiano, Juan F.; Larhammar, Dan; Sylvie Dufour (Frontiers in Endocrinology, 2022)

Effects of chronic exposure of metals released from the dissolution of an aluminium galvanic anode on the Pacific oyster Crassostrea gigas - Alexandre Levallois; Christelle Caplat; Olivier Basuyaux; Jean-Marc Lebel; Antoine Laisney; Katherine Costil; Antoine Serpentini (Aquatic Toxicology, 2022)
Among the anthropogenic sources releasing metallic species into the marine environment, the galvanic anode cathodic protection system (GACP) is widely used to protect submerged metallic structures from corrosion. Galvanic anodes are an alloy of metals of which the main component is aluminum or zinc. Very few studies were performed to study their potential biological effects. We investigated the chronic toxicity of an aluminum-based galvanic anode on the Pacific oyster, Crassostrea gigas. Oysters were exposed for 84 days to three concentrations of aluminum (50, 100 and 300 µg L−1) obtained with an electrochemical experimental device simulating the dissolution of a galvanic anode. At different exposure times, we studied a battery of biomarkers of the immune system, reproductive parameters and the metabolic state of the oysters. Results demonstrated a sensitivity of oysters at the highest concentration and some biological effects were observed especially for the malondialdehyde content in the digestive gland after 84 days of exposure. In addition to these biomarkers, the bioaccumulation of the different metals composing the anode was measured in oysters’ tissues. Bivalves bioaccumulated more zinc than aluminum, even if aluminium was present in greater concentrations during exposures. Moreover, exposure time did not influence the bioaccumulation of aluminum in contrast to zinc.
Keywords: aluminium; Bioaccumulation; Biological effects; Crassostrea gigas; galvanic anode; Oyster

Estimation of the Maternal Investment of Sea Turtles by Automatic Identification of Nesting Behavior and Number of Eggs Laid from a Tri-Axial Accelerometer - Jeantet, Lorène; Hadetskyi, Vadym; Vigon, Vincent; Korysko, François; Paranthoen, Nicolas; Chevallier, Damien (Animals, 2022)

European flounder foraging movements in an estuarine nursery seascape inferred from otolith microchemistry and stable isotopes - Teichert, Nils; Lizé, Anne; Tabouret, Hélène; Roussel, Jean-Marc; Bareille, Gilles; Trancart, Thomas; Acou, Anthony; Virag, Laure-Sarah; Pecheyran, Christophe; Alexandre Carpentier; Feunteun, Eric (Marine Environmental Research, 2022)
Despite the importance of estuarine nurseries in the regulation of many fish stocks, temporal and spatial movements and habitat use patterns of juvenile fish remain poorly understood. Overall, combining several movement metrics allowed us to characterize dispersal patterns of juvenile flounder, Platichthys flesus, along an estuarine seascape. Specifically, we investigated otolith microchemistry signatures (Sr:Ca and Ba:Ca ratios) and stable isotope ratios (δ13C and δ15N) in muscles of these juveniles, during three consecutive years to assess inter-annual fluctuations in their home range and isotopic niches. The morphological condition and lipid content of individuals were lower in years of high as compared to low dispersal along the estuarine gradient. We discuss these results in relation to the ecosystem productivity and intra- and inter-specific competition level, which in turn affects movements and foraging behaviors of juvenile flounders.