Anthropogenic pressures coincide with Neotropical biodiversity hotspots in a flagship butterfly group - Doré, Maël; Willmott, Keith; Leroy, Boris; Chazot, Nicolas; Mallet, James; Freitas, André V. L.; Hall, Jason P. W.; Lamas, Gerardo; Dasmahapatra, Kanchon K.; Fontaine, Colin; Elias, Marianne (Diversity and Distributions, 2021)

Aquatic biota responses to temperature in a high Andean geothermal stream - Quenta‐Herrera, Estefania; Daza, Antonio; Lazzaro, Xavier; Jacobsen, Dean; Dangles, Olivier; Cauvy‐Fraunié, Sophie (Freshwater Biology, 2021)
The impact of global warming on mountain ecosystems is predicted to be high, and particularly in the tropical region. Geothermal streams have provided comprehensive evidence about how aquatic biodiversity changes across natural thermal gradients, but current knowledge is restricted to arctic and temperate zones. Thermal tolerances are different in tropical biological communities, resulting in high thermal sensitivity and low capacity to endure change in their thermal environments. This feature can change the response of aquatic organisms to warming, yet there is little empirical evidence to support this assumption. In this study, we address this issue by evaluating how water temperature affects biodiversity, and the structure of primary and secondary producers of a high-elevation geothermal stream system (4,500 m above sea level) in the Bolivian Andes. We analysed multi-taxa responses to increased water temperature using benthic macroinvertebrate families, benthic algae and cyanobacteria, fishes, and macrophytes as study organisms. Different models were run to assess the response of aquatic biota to temperature. In addition, threshold indicator taxa analysis (TITAN) was used to identify changes in macroinvertebrate taxa distributions along the thermal gradient. We found that macroinvertebrate richness decreased at 24–25°C due to the different taxon-specific responses to temperature. Threshold indicator taxa analysis identified 17 temperature thresholds for each family of macroinvertebrates. Changes in macroinvertebrate community composition were significantly associated with changes in water temperature. Similarly, changes in macrophytes were associated with temperature differences, and high macrophyte richness was found at 19–20°C. Chlorophyll-a concentration of green algae and diatoms was higher at intermediate temperatures 20–22°C, macroinvertebrates density peaked at 27°C, and fish body size reduced linearly with temperature. Temperature increase in the geothermal stream resulted in a reduction of aquatic diversity and primary and secondary producers by simplifying the community structure to a few warm-adapted taxa and reduced body size. These patterns differed from those obtained in temperate/arctic geothermal streams, but are similar to other studies at high-elevation. In a context of increasing warming, the ecological structure of high-elevation streams might lose cold-adapted taxa, and change to smaller populations. Additional studies based on ecosystem functioning of geothermal streams could lead to a better understanding on how warming affects high-elevation streams.

Are we ready to track climate‐driven shifts in marine species across international boundaries? ‐ A global survey of scientific bottom trawl data - Maureaud, Aurore; Frelat, Romain; Pécuchet, Laurène; Shackell, Nancy; Mérigot, Bastien; Pinsky, Malin L.; Amador, Kofi; Anderson, Sean C.; Arkhipkin, Alexander; Auber, Arnaud; Barri, Iça; Bell, Richard J.; et al. (Global Change Biology, 2021)

Assessment of ecological status of the lagoon of Bora-Bora Island (French Polynesia) - Lecchini, David; Frédéric Bertucci; Schneider, Denis; Berthe, Cécile; Gache, Camille; Fogg, Lily; Waqalevu, Viliame; Maueau, Tehani; Sturny, Vincent; Bambridge, Tamatoa; Tong Sang, Gaston (Regional Studies in Marine Science, 2021)

Bi-decadal variability in physico-biogeochemical characteristics of temperate coastal ecosystems: from large-scale to local drivers - Lheureux, Arnaud; Savoye, Nicolas; Del Amo, Yolanda; Goberville, Eric; Bozec, Yann; Elsa Breton; Conan, Pascal; L’Helguen, Stéphane; Mousseau, Laure; Raimbault, Patrick; Rimelin-Maury, Peggy; Seuront, Laurent; et al. (Marine Ecology Progress Series, 2021)
Coastal marine ecosystems, which play a crucial role in the biogeochemical and ecological functioning of the earth system, are highly sensitive to the combined effects of climate and human activities. Because of their location, coastal ecosystems are directly influenced by human activities. Thus, it remains challenging to assess the spatial and temporal scales at which climate influences coastal ecosystems. Twelve sampling stations distributed in eight ecosystems of Western Europe were monitored during two decades for physico-biogeochemical parameters (temperature, salinity, concentrations of dissolved oxygen, nutrients and particulate material). The study encompasses a large diversity of temperate coastal ecosystems regarding geomorphology, trophic status, tidal regime, river influence, turbidity, and so on. Time-series analysis coupled with standardised 3-mode Principal Component Analyses, Partial Triadic Analyses and correlations were used to assess bi-decadal variability and ecosystems trajectories, and to detect the large-scale, regional and local drivers. Overall results highlight two abrupt changes in 2001 and 2005. The bi-decadal changes are related to changes in large-scale and regional climate; detected through proxies of temperature and atmospheric circulation, as well as through river discharge. Ecosystem trajectories usually move towards an increase in temperature, salinity and/or a decrease in chlorophyll-a, nutrients and particulate matter. However, the magnitude of change, the year-to-year variability and the sensitivity to the 2001 and 2005 changes vary among the ecosystems. This study highlights the need to perform long-term time series and combining data sets as well as multi-ecosystem and local studies to better understand long-term variability of coastal ecosystems and its associated drivers.

Biological invasions in France: Alarming costs and even more alarming knowledge gaps - Renault, David; Manfrini, Eléna; Leroy, Boris; Diagne, Christophe; Ballesteros-Mejia, Liliana; Angulo, Elena; Courchamp, Franck (NeoBiota, 2021)

Biosorption capacity of genus Dictyota facing organochlorine pesticide pollutions in coastal areas of the Lesser Antilles - Contarini, Paul-Emile; Charlotte R. Dromard (Aquatic Botany, 2021)

Born With Bristles: New Insights on the Kölliker's Organs of Octopus Skin - Villanueva, Roger; Coll-Lladó, Montserrat; Laure Bonnaud-Ponticelli; Carrasco, Sergio; Escolar, Oscar; Fernández-Álvarez, Fernando Á.; Gleadall, Ian; Nabhitabhata, Jaruwat; Ortiz, Nicolás; Rosas, Carlos; Sánchez, Pilar; Voight, Janet; et al. (Frontiers in Marine Science, 2021)

CÉPHALOPODES, EXPÉRIMENTATION ANIMALE ET LÉGISLATIONEUROPÉENNE - Laure Bonnaud-Ponticelli (Bulletin de l'Académie Vétérinaire de France, 2021)

Changes to an urban marina soundscape associated with COVID-19 lockdown in Guadeloupe - Frédéric Bertucci; Lecchini, David; Greeven, Céline; Brooker, Rohan M.; Minier, Lana; Cordonnier, Sébastien; René-Trouillefou, Malika; Parmentier, Eric (Environmental Pollution, 2021)

Characteristics of sound production and associated pharyngeal jaws in the tomtate grunt Haemulon aurolineatum (Cuvier, 1830) in Caribbean reefs - Millot, Morgane; Frédéric Bertucci; Lecchini , David; Smeets, Sarah; René-Trouillefou, Malika; Parmentier, Eric (Belgian Journal of Zoology, 2021)

The Chicken and Egg Situation of Thyroid Hormone and Glucocorticoid Signaling during Postembryonic Development - Sylvie Dufour; Sachs, Laurent M (Endocrinology, 2021)

A CO2 sink in a tropical coastal lagoon impacted by cultural eutrophication and upwelling - Erbas, Thaís; Marques, Aguinaldo; Gwenaël Abril (Estuarine, Coastal and Shelf Science, 2021)

A comment on “Morphologic and genetic characterization of Corsican and Sardinian trout with comments on Salmotaxonomy” by Delling et al. (2020): protected Tyrrhenian trouts must be named - Denys, Gaël (Knowledge & Management of Aquatic Ecosystems, 2021)

The complete mitochondrial genome of Barbatula quignardi (Băcescu-Meşter, 1967) (Teleostei, Nemacheilidae) - Gauliard, Camille; Denys, Gaël; Perea, Silvia; Dettai, Agnès (Cybium, 2021)
The complete mitochondrial DNA sequence of Barbatula quignardi (Teleostei, Nemacheilidae) was sequenced from a museum voucher caught in its type locality (Lez River). The sequence was 16,641 bp in length, consisted of 13 protein-coding genes, 22 transfer RNA genes including 2 tRNA-Leu and 2 tRNA-Ser, 2 ribosomic RNA genes and the control region. Intergenic space and overlapping gene sequences were found. The base composition of the whole mtDNA was 28.7% A, 26.2% T, 27.2% C and 17.9% G.

Conservative route to genome compaction in a miniature annelidAbstract - Martín-Durán, José M.; Vellutini, Bruno C.; Marlétaz, Ferdinand; Cetrangolo, Viviana; Cvetesic, Nevena; Thiel, Daniel; Henriet, Simon; Grau-Bové, Xavier; Carrillo-Baltodano, Allan M.; Gu, Wenjia; Kerbl, Alexandra; Marquez, Yamile; et al. (Nature Ecology & Evolution, 2021)

Contribution of toothfish depredated on fishing lines to the energy intake of killer whales off the Crozet Islands: a multi-scale bioenergetic approach - Faure, Johanna; Clara Péron; Nicolas Gasco; Massiot-Granier, Félix; Spitz, J; Guinet, C; Tixier, P (Marine Ecology Progress Series, 2021)
Fisheries modify prey availability for marine predators by extracting resources but also by providing them with new feeding opportunities. Among these, depredation, which occurs when predators feed on fish caught on fishing gear, is a behavior developed by many species as a way to acquire food through limited foraging effort. However, the extent to which depredated resources from fisheries contribute to the energetic requirements and affect the demography of depredating individuals is unknown. We investigated the contribution of Patagonian toothfish Dissostichus eleginoides depredated on longlines to the energetic requirements of killer whales Orcinus orca around the Crozet Islands (southern Indian Ocean) over the period 2007-2018. Our results indicate that during days when depredation occurred, depredating individuals fulfilled on average 94.1% of their daily energetic requirements with depredated toothfish. However, the contribution varied from 1.2 to 13.3% of the monthly energetic requirements and from 2.4 to 8.8% of the yearly energetic requirements of the total population. Together, these findings suggest that intake of depredated toothfish can be substantial at a fine scale (daily and individually), potentially leading to temporary provisioning effects and changes in predation pressures. These effects become minor (<10%), however, when considering the full population over a whole year. The contribution of depredated fish to the annual energetic requirements of the population has increased in recent years, likely due to larger fishing quotas and greater opportunities for whales to depredate, which stresses the importance of accounting for depredation in ecosystem-based management of fishing activity.

Coupling high frequency monitoring and bioassay experiments to investigate a harmful algal bloom in the Bay of Seine (French-English Channel) - Serre-Fredj, Léon; Jacqueline, Franck; Navon, Maxime; Izabel, Guillaume; Chasselin, Léo; Jolly, Orianne; Répécaud, Michel; Pascal Claquin (Marine Pollution Bulletin, 2021)
Coastal ecosystems are increasingly threatened by eutrophication and dystrophy. In this context, the full pattern of a bloom dominated by the dinoflagellate, Lepidodinium chlorophorum, was investigated by a high frequency monitoring buoy equipped with sensors allowing nutrients and photosynthesis measurements. An increase of the N/P ratio affected phytoplankton physiology leading to bloom collapse with a slight oxygen depletion. In parallel, enrichment experiments were performed on the natural bloom population. After 5 days of incubation the community structure, using flow cytometry and several physiological parameters were analysed. The data reveal a potential N and P co-limitation and a decoupling between primary production and productivity in fully enriched conditions. Under unbalanced N/P inputs, high level of alkaline phosphatase activity and transparent exopolymeric particle production, which favour phytoplankton sedimentation, were observed. Nutrient inputs and their stoichiometry control phytoplankton growth, the community structure, physiological regulations, the fate of the bloom and consequences.

Cumulative effects of marine renewable energy and climate change on ecosystem properties: Sensitivity of ecological network analysis - Nogues, Quentin; Raoux, Aurore; Araignous, Emma; Chaalali, Aurélie; Hattab, Tarek; Leroy, Boris; Ben Rais Lasram, Frida; David, Valérie; Le Loc'h, Francois; Dauvin, Jean-Claude; Nathalie Niquil (Ecological Indicators, 2021)

Data Curation, Fisheries and Ecosystem-based Management : The Case Study of the Pecheker Database - Martin Alexis; Charlotte Chazeau; Nicolas Gasco; Guy Duhamel; Patrice Pruvost (International Journal of Digital Curation, 2021)
The scientific monitoring of the Southern Ocean French fishing industry is based on the use the Pecheker database. Pecheker is dedicated to the digital curation of the data collected on field by scientific observers and which analysis allows the scientists of the Muséum national d’Histoire naturelle institution to provide guidelines and advice for the regulation of the fishing activity, the protection of the fish stocks and the protection of the marine ecosystems. The template of Pecheker has been developed to make the database adapted to the ecosystem-based management concept. Considering the global context of biodiversity erosion, this modern approach of management aims to take account of the environmental background of the fisheries to ensure their sustainable development. Completeness and high quality of the raw data is a key element for an ecosystem-based management database such as Pecheker. Here, we present the development of this database as a case study of fisheries data curation to be shared with the readers. Full code to deploy a database based on the Pecheker template is provided in supplementary materials. Considering the success factors we could identify, we propose a discussion about how the community could build a global fisheries information system based on a network of small databases including interoperability standards.

Decadal trajectories of phytoplankton communities in contrasted estuarine systems in an epicontinental sea - Lefran, Angéline; Hernández-Fariñas, Tania; Gohin, Francis; Pascal Claquin (Estuarine, Coastal and Shelf Science, 2021)
In coastal areas, global changes are known to affect estuaries and their plume leading to water temperature increase and river discharge variations, which are two of the main drivers controlling phytoplankton dynamics. This paper aims at understanding the past 10 years’ variations in term of communities’ stability and trajectories along with their relationship with the environment. Considering the high environmental variability along coastal areas, we focused our study on six contrasted estuarine systems from the eastern English Channel. Using monthly monitoring from 2008 to 2019, the response of the micro-phytoplankton compartment was investigated through the abundances of a hundred taxa and several abiotic parameters’ records. The results indicate an overall stability in community composition with an average of 30–40% similarity between pairs of samples over the study period. The phytoplankton assemblages also display greater spatial heterogeneity during summer in comparison with other seasons. The co-inertia analysis highlighted four separate systems linked to major drivers; a system under strong river and nutrient flows influence, a well-mixed and oxygenized estuary, a system challenged by offshore marine waters, and finally a system under shellfish farms pressure. This structuration is built from the dominance of a handful of species that differs from one place to another, which explains why phytoplankton is mostly site specific. Additionally, the low variations led a by few species’ dominance also explains the interannual stability noticed during summer at each area, in spite of the high diversity observed.

Detailed assessment of the reported economic costs of invasive species in Australia - Bradshaw, Corey J. A.; Hoskins, Andrew J.; Haubrock, Phillip J.; Cuthbert, Ross N.; Diagne, Christophe; Leroy, Boris; Andrews, Lindell; Page, Brad; Cassey, Phill; Sheppard, Andy W.; Courchamp, Franck (NeoBiota, 2021)

Development of robust assessment methods and harvest strategies for spatially complex, multi-jurisdictional toothfish fisheries in the Southern Ocean - Philippe Ziegler; Burch, Paul; Clara Péron; Welsford, Dirk; Bryn, Farmer; Yates, Peter; Potts, J.; Woodcock, Emma; Barnes, T.; Guy Duhamel; Gardner, C. (Fisheries Research and Development Corporation Project n°2013/013, 2021)

Dietary taurine improves vision in different age gilthead sea bream (Sparus aurata) larvae potentially contributing to increased prey hunting success and growth - Gaon, A.; Nixon, O.; Tandler, A.; Falcon, J.; Besseau, L.; Escande, M.; El Sadin, S.; Allon, G.; Koven, W. (Aquaculture, 2021)

Disentangling tropicalization and deborealization in marine ecosystems under climate change - Matthew McLean; David Mouillot; Aurore A. Maureaud; Tarek Hattab; M. Aaron MacNeil; Goberville, Eric; Martin Lindegren; Georg Engelhard; Malin Pinsky; Arnaud Auber (Current Biology, 2021)
Summary As climate change accelerates, species are shifting poleward and subtropical and tropical species are colonizing temperate environments.1, 2, 3 A popular approach for characterizing such responses is the community temperature index (CTI), which tracks the mean thermal affinity of a community. Studies in marine,4 freshwater,5 and terrestrial6 ecosystems have documented increasing CTI under global warming. However, most studies have only linked increasing CTI to increases in warm-affinity species. Here, using long-term monitoring of marine fishes across the Northern Hemisphere, we decomposed CTI changes into four underlying processes—tropicalization (increasing warm-affinity), deborealization (decreasing cold-affinity), borealization (increasing cold-affinity), and detropicalization (decreasing warm-affinity)—for which we examined spatial variability and drivers. CTI closely tracked changes in sea surface temperature, increasing in 72% of locations. However, 31% of these increases were primarily due to decreases in cold-affinity species, i.e., deborealization. Thus, increases in warm-affinity species were prevalent, but not ubiquitous. Tropicalization was stronger in areas that were initially warmer, experienced greater warming, or were deeper, while deborealization was stronger in areas that were closer to human population centers or that had higher community thermal diversity. When CTI (and temperature) increased, species that decreased were more likely to be living closer to their upper thermal limits or to be commercially fished. Additionally, warm-affinity species that increased had smaller body sizes than those that decreased. Our results show that CTI changes arise from a variety of underlying community responses that are linked to environmental conditions, human impacts, community structure, and species characteristics.
Keywords: bottom trawl; community temperature index; Fisheries; marine ecology; thermal affinity

Do Hydrothermal Shrimp Smell Vents? - Ravaux, Juliette; Machon, Julia; Shillito, Bruce; Barthélémy, Dominique; Amand, Louis; Cabral, Mélanie; Delcour, Elise; Zbinden, Magali (Insects, 2021)
Deep-sea species endemic to hydrothermal vents face the critical challenge of detecting active sites in a vast environment devoid of sunlight. This certainly requires specific sensory abilities, among which olfaction could be a relevant sensory modality, since chemical compounds in hydrothermal fluids or food odors could potentially serve as orientation cues. The temperature of the vent fluid might also be used for locating vent sites. The objective of this study is to observe the following key behaviors of olfaction in hydrothermal shrimp, which could provide an insight into their olfactory capacities: (1) grooming behavior; (2) attraction to environmental cues (food odors and fluid markers). We designed experiments at both deep-sea and atmospheric pressure to assess the behavior of the vent shrimp Rimicaris exoculata and Mirocaris fortunata, as well as of the coastal species Palaemon elegans and Palaemon serratus for comparison. Here, we show that hydrothermal shrimp groom their sensory appendages similarly to other crustaceans, but this does not clean the dense bacterial biofilm that covers the olfactory structures. These shrimp have previously been shown to possess functional sensory structures, and to detect the environmental olfactory signals tested, but we do not observe significant attraction behavior here. Only temperature, as a signature of vent fluids, clearly attracts vent shrimp and thus is confirmed to be a relevant signal for orientation in their environment.
Keywords: antennules; behavior; chemosensory perception; grooming; hydrothermal shrimp; olfaction; thermal detection

Do Hydrothermal Shrimp Smell Vents? - Ravaux, Juliette; Machon, Julia; Shillito, Bruce; Barthélémy, Dominique; Amand, Louis; Cabral, Mélanie; Delcour, Elise; Zbinden, Magali (Insects, 2021)
Deep-sea species endemic to hydrothermal vents face the critical challenge of detecting active sites in a vast environment devoid of sunlight. This certainly requires specific sensory abilities, among which olfaction could be a relevant sensory modality, since chemical compounds in hydrothermal fluids or food odors could potentially serve as orientation cues. The temperature of the vent fluid might also be used for locating vent sites. The objective of this study is to observe the following key behaviors of olfaction in hydrothermal shrimp, which could provide an insight into their olfactory capacities: (1) grooming behavior; (2) attraction to environmental cues (food odors and fluid markers). We designed experiments at both deep-sea and atmospheric pressure to assess the behavior of the vent shrimp and , as well as of the coastal species and for comparison. Here, we show that hydrothermal shrimp groom their sensory appendages similarly to other crustaceans, but this does not clean the dense bacterial biofilm that covers the olfactory structures. These shrimp have previously been shown to possess functional sensory structures, and to detect the environmental olfactory signals tested, but we do not observe significant attraction behavior here. Only temperature, as a signature of vent fluids, clearly attracts vent shrimp and thus is confirmed to be a relevant signal for orientation in their environment.

Do Hydrothermal Shrimp Smell Vents? - Juliette Ravaux; Machon, Julia; Shillito, Bruce; Barthélémy, Dominique; Amand, Louis; Cabral, Mélanie; Delcour, Elise; Zbinden, Magali (Insects, 2021)

The economic costs of biological invasions in Africa: a growing but neglected threat? - Diagne, Christophe; Turbelin, Anna J.; Moodley, Desika; Novoa, Ana; Leroy, Boris; Angulo, Elena; Adamjy, Tasnime; Dia, Cheikh A.K.M.; Taheri, Ahmed; Tambo, Justice; Dobigny, Gauthier; Courchamp, Franck (NeoBiota, 2021)

Economic costs of biological invasions within North America - Crystal-Ornelas, Rob; Hudgins, Emma J; Cuthbert, Ross N.; Haubrock, Phillip J.; Fantle-Lepczyk, J; Angulo, Elena; Kramer, Andrew M.; Ballesteros-Mejia, Liliana; Leroy, Boris; Leung, Brian; López-López, E; Diagne, Christophe; et al. (NeoBiota, 2021)

Economic costs of invasive alien species across Europe - Haubrock, Phillip J.; Turbelin, Anna J.; Cuthbert, Ross N.; Novoa, Ana; Taylor, Nigel G.; Angulo, Elena; Ballesteros-Mejia, Liliana; Bodey, Thomas W.; Capinha, César; Diagne, Christophe; Essl, Franz; Golivets, Marina; et al. (NeoBiota, 2021)

Economic costs of invasive alien species in the Mediterranean basin - Kourantidou, Melina; Cuthbert, Ross N.; Haubrock, Phillip J.; Novoa, Ana; Taylor, Nigel G.; Leroy, Boris; Capinha, César; Renault, David; Angulo, Elena; Diagne, Christophe; Courchamp, Franck (NeoBiota, 2021)

Effects of Coastline Modification on Coral Reef Fish Nurseries (Moorea, French Polynesia) - Gasc, Julien; Gache, Camille; Frédéric Bertucci; Madi Moussa, Rakamaly; Waqalevu, Viliame; Lecchini, David (Journal of Coastal Research, 2021)

Effects of Melatonin on Anterior Pituitary Plasticity: A Comparison Between Mammals and Teleosts - Ciani, Elia; Haug, Trude M.; Maugars, Gersende; Weltzien, Finn-Arne; Falcón, Jack; Fontaine, Romain (Frontiers in Endocrinology, 2021)
Melatonin is a key hormone involved in the photoperiodic signaling pathway. In both teleosts and mammals, melatonin produced in the pineal gland at night is released into the blood and cerebrospinal fluid, providing rhythmic information to the whole organism. Melatonin acts via specific receptors, allowing the synchronization of daily and annual physiological rhythms to environmental conditions. The pituitary gland, which produces several hormones involved in a variety of physiological processes such as growth, metabolism, stress and reproduction, is an important target of melatonin. Melatonin modulates pituitary cellular activities, adjusting the synthesis and release of the different pituitary hormones to the functional demands, which changes during the day, seasons and life stages. It is, however, not always clear whether melatonin acts directly or indirectly on the pituitary. Indeed, melatonin also acts both upstream, on brain centers that control the pituitary hormone production and release, as well as downstream, on the tissues targeted by the pituitary hormones, which provide positive and negative feedback to the pituitary gland. In this review, we describe the known pathways through which melatonin modulates anterior pituitary hormonal production, distinguishing indirect effects mediated by brain centers from direct effects on the anterior pituitary. We also highlight similarities and differences between teleosts and mammals, drawing attention to knowledge gaps, and suggesting aims for future research.

Efficiency of the call-broadcast method for detecting two Caribbean-endemic columbid game species - Cambrone, Christopher; Bezault, Etienne; Cézilly, Frank (European Journal of Wildlife Research, 2021)

Electron & Biomass Dynamics of Cyanothece Under Interacting Nitrogen & Carbon Limitations - Rabouille, Sophie; Campbell, Douglas A.; Masuda, Takako; Zavřel, Tomas; Bernát, Gabor; Polerecky, Lubos; Halsey, Kimberly; Eichner, Meri; Kotabová, Eva; Stephan, Susanne; Lukeš, Martin; Pascal Claquin; et al. (Frontiers in Microbiology, 2021)

Eleotris (Teleostei: Eleotridae) from Indonesia with description of three news species - Marion Mennesson; Philippe Keith; Hubert, Nicolas (Pacific Science, 2021)
The species of Eleotris from Indonesia are reviewed and compared to the known species described from the area. Nine species are recognized including three new species in the ‘melanosoma’ neuromast pattern group. These are described using genetic and morpho-meristic approaches. The new species differ by a high percentage of genetic divergence in partial COI gene (652 bp) and by several characters including the number of pectoral fin rays, the number of scales in lateral, predorsal, forward and zigzag series. The main characteristics of the other known species in the area in the ‘melanosoma’ group, Eleotris melanosoma Bleeker, 1853 and Eleotris macrolepis (Bleeker, 1875), both belonging to this group, are given for comparison. A key for Eleotris species from Indonesia is provided.

Environmental heterogeneity drives phytoplankton community assembly patterns in a tropical riverine system - Cédric Hubas; Goberville, Eric (Peer Community In Ecology, 2021)

Epizoic diatoms on sea turtles and their relationship to host species, behaviour and biogeography: a morphological approach - Riaux-Gobin, Catherine; Ashworth, Matt P.; Kociolek, J.Patrick; Chevallier, Damien; Saenz-Agudelo, Pablo; Witkowski, Andrzej; Daniszewska-Kowalczyk, Genowefa; Gaspar, Cecile; Lagant, Magali; Touron, Margaux; Carpentier, Alice; Stabile, Vie; et al. (European Journal of Phycology, 2021)

Establishing water sample protocols for radiocarbon analysis at LAC-UFF, Brazil - Bragança, Daniela; Oliveira, Fabiana; Macario, Kita; Nunes, Vinicius; Muniz, Marcelo; Lamego, Fernando; Gwenaël Abril; Nepomuceno, Aguinaldo; Solís, Corina; Rodríguez-Ceja, María (Radiocarbon, 2021)
Since the establishment of the first radiocarbon accelerator mass spectrometry facility in Latin America in 2009, the Radiocarbon Laboratory team of Universidade Federal Fluminense (LAC-UFF) has worked to improve sample preparation protocols and increase the range of environmental matrices to be analyzed. We now present the preliminary results for DIC sample preparation protocols. The first validation tests include background evaluation with pMC value (0.35 ± 0.04) using bicarbonate dissolved in water. We also analyzed surface seawater resulting in pMC value (101.38 ± 0.38) and a groundwater previously dated from LEMA AMS-Laboratory with pMC value (12.30 ± 0.15).

Estimating ecotoxicological effects of chemicals on tropical reef-building corals; a systematic review protocol - Ouédraogo, Dakis-Yaoba; Perceval, Olivier; Ferrier-Pages, Christine; Domart-Coulon, Isabelle; Hédouin, Laetitia; Burga, Karen; Mireille M.M. Guillaume; Calvayrac, Christophe; Castelin, Magalie; Reyjol, Yorick; Sordello, Romain (Environmental Evidence, 2021)

European small pelagic fish distribution under global change scenarios - Schickele, Alexandre; Goberville, Eric; Leroy, Boris; Grégory Beaugrand; Hattab, Tarek; Patrice Francour; Virginie Raybaud (Fish and Fisheries, 2021)
The spectre of increasing impacts on exploited fish stocks in consequence of warmer climate conditions has become a major concern over the last decades. It is now imperative to improve the way we project the effects of future climate warming on fisheries. While estimating future climate‐induced changes in fish distribution is an important contribution to sustainable resource management, the impacts on European small pelagic fish—representing over 50% of the landings in the Mediterranean and Black Sea between 2000 and 2013—are yet largely understudied. Here, we investigated potential changes in the spatial distribution of seven of the most harvested small pelagic fish species in Europe under several climate change scenarios over the 21st century. For each species, we considered eight Species Distribution Models (SDMs), five General Circulation Models (GCMs) and three emission scenarios (the IPCC Representative Concentration Pathways; RCPs). Under all scenarios, our results revealed that the environmental suitability for most of the seven species may strongly decrease in the Mediterranean and western North Sea while increasing in the Black and Baltic Seas. This potential northward range expansion of species is supported by a strong convergence among projections and a low variability between RCPs. Under the most pessimistic scenario (RCP8.5), climate‐related local extinctions were expected in the south‐eastern Mediterranean basin. Our results highlight that a multi‐SDM, multi‐GCM, multi‐RCP approach is needed to produce more robust ecological scenarios of changes in exploited fish stocks in order to better anticipate the economic and social consequences of global climate change.

Eutrophication overcoming carbonate precipitation in a tropical hypersaline coastal lagoon acting as a CO2 sink (Araruama Lagoon, SE Brazil) - Cotovicz, Luiz C.; Knoppers, Bastiaan A.; Régis, Carolina R.; Tremmel, Daniel; Costa-Santos, Suzan; Gwenaël Abril (Biogeochemistry, 2021)

Evidence on the impacts of chemicals arising from human activity on tropical reef-building corals; a systematic map - Ouédraogo, Dakis-Yaoba; Delaunay, Mathilde; Sordello, Romain; Hédouin, L.; Castelin, Magalie; Perceval, Olivier; Domart-Coulon, Isabelle; Burga, Karen; Ferrier-Pages, Christine; Multon, Romane; Mireille M.M. Guillaume; Léger, Clément; et al. (Environmental Evidence, 2021)

Exploration of chemosensory ionotropic receptors in cephalopods: the IR25 gene is expressed in the olfactory organs, suckers, and fins of Sepia officinalis. - Aude Andouche; Valera, Stéphane; Sébastien Baratte (Chem Senses, 2021)
While they are mostly renowned for their visual capacities, cephalopods are also good at olfaction for prey, predator, and conspecific detection. The olfactory organs and olfactory cells are well described but olfactory receptors-genes and proteins-are still undescribed in cephalopods. We conducted a broad phylogenetic analysis of the ionotropic glutamate receptor family in mollusks (iGluR), especially to identify IR members (Ionotropic Receptors), a variant subfamily whose involvement in chemosensory functions has been shown in most studied protostomes. A total of 312 iGluRs sequences (including 111 IRs) from gastropods, bivalves, and cephalopods were identified and annotated. One orthologue of the gene coding for the chemosensory IR25 co-receptor has been found in Sepia officinalis (Soff-IR25). We searched for Soff-IR25 expression at the cellular level by in situ hybridization in whole embryos at late stages before hatching. Expression was observed in the olfactory organs, which strongly validates the chemosensory function of this receptor in cephalopods. Soff-IR25 was also detected in the developing suckers, which suggests that the unique « taste by touch » behavior that cephalopods execute with their arms and suckers share features with olfaction. Finally, Soff-IR25 positive cells were unexpectedly found in fins, the two posterior appendages of cephalopods, mostly involved in locomotory functions. This result opens new avenues of investigation to confirm fins as additional chemosensory organs in cephalopods.
Keywords: Animals; Cephalopoda; Phylogeny; Receptors, Ionotropic Glutamate; Receptors, Odorant; Sepia; Smell

First Assessment of the Benthic Meiofauna Sensitivity to Low Human-Impacted Mangroves in French Guiana - Michelet, Claire; Zeppilli, Daniela; Cédric Hubas; Baldrighi, Elisa; Cuny, Philippe; Guillaume Dirberg; Militon, Cécile; Walcker, Romain; Lamy, Dominique; Jézéquel, Ronan; Receveur, Justine; Gilbert, Franck; et al. (Forests, 2021)

First highlight of sound production in the glassy sweeper Pempheris schomburgkii (Pempheridae) - Frédéric Bertucci; Parmentier, Eric; Hillion, Anaïs; Cordonnier, Sébastien; Lecchini, David; René-Trouillefou, Malika (Marine Biology, 2021)

First use of acoustic calls to distinguish cryptic members of a fish species complex - Parmentier, Eric; Scalbert, Robin; Raick, Xavier; Gache, Camille; Frédérich, Bruno; Frédéric Bertucci; Lecchini, David (Zoological Journal of the Linnean Society, 2021)

Food source diversity, trophic plasticity, and omnivory enhance the stability of a shallow benthic food web from a high-Arctic fjord exposed to freshwater inputs - Bridier, Guillaume; Frédéric Olivier; Chauvaud, Laurent; Sejr, Mikael K.; Grall, Jacques (Limnology and Oceanography, 2021)
Under climate change, many Arctic coastal ecosystems receive increasing amounts of freshwater, with ecological consequences that remain poorly understood. In this study, we investigated how freshwater inputs may affect the small-scale structure of benthic food webs in a low-production high-Arctic fjord (Young Sound, NE Greenland). We seasonally sampled benthic invertebrates from two stations receiving contrasting freshwater inputs: an inner station exposed to turbid and nutrient-depleted freshwater flows and an outer station exposed to lower terrestrial influences. Benthic food web structure was described using a stable isotope approach (δ13C and δ15N), Bayesian models, and community-wide metrics. The results revealed the spatially and temporally homogeneous structure of the benthic food web, characterized by high trophic diversity (i.e., a wide community isotopic niche). Such temporal stability and spatial homogeneity mirrors the high degree of trophic plasticity and omnivory of benthic consumers that allows the maintenance of several carbon pathways through the food web despite different food availability. Furthermore, potential large inputs of shelf organic matter together with local benthic primary production (i.e., macroalgae and presumably microphytobenthos) may considerably increase the stability of the benthic food web by providing alternative food sources to locally runoff-impacted pelagic primary production. Future studies should assess beyond which threshold limit a larger increase in freshwater inputs might cancel out these stability factors and lead to marked changes in Arctic benthic ecosystems.

Four-Year Temporal Study of an Intertidal Artificial Structure in the English Channel - Dauvin, Jean-Claude; Deloor, Maël; Pezy, Jean-Philippe; Raoux, Aurore; Pascal Claquin; Foveau, Aurélie (Journal of Marine Science and Engineering, 2021)

Freshwater fish of Solomon Islands - Philippe Keith; Boseto, David; Clara Lord (Société Française d’Ichtyologie, 2021)

Fully Convolutional Neural Network: A solution to infer animal behaviours from multi-sensor data - Jeantet, Lorène; Vigon, Vincent; Geiger, Sébastien; Chevallier, Damien (Ecological Modelling, 2021)

Global systematic diversity, range distributions, conservation and taxonomic assessments of graylings (Teleostei: Salmonidae; Thymallus spp.)Abstract - Weiss, Steven J.; Gonçalves, Duarte V.; Secci-Petretto, Giulia; Englmaier, Gernot K.; Gomes-Dos-Santos, André; Denys, Gaël; Persat, Henri; Antonov, Alexander; Hahn, Christoph; Taylor, Eric B.; Froufe, Elsa (Organisms Diversity & Evolution, 2021)

Gonadal transcriptomes associated with sex phenotypes provide potential male and female candidate genes of sex determination or early differentiation in Crassostrea gigas, a sequential hermaphrodite mollusc. - Broquard, Coralie; Saowaros, Suwansa-Ard; Lepoittevin, Mélanie; Degremont, Lionel; Lamy, Jean-Baptiste; Morga, Benjamin; Elizur, Abigail; Anne-Sophie Martinez (BMC Genomics, 2021)
BACKGROUND: In the animal kingdom, mollusca is an important phylum of the Lophotrochozoa. However, few studies have investigated the molecular cascade of sex determination/early gonadal differentiation within this phylum. The oyster Crassostrea gigas is a sequential irregular hermaphrodite mollusc of economic, physiological and phylogenetic importance. Although some studies identified genes of its sex-determining/-differentiating pathway, this particular topic remains to be further deepened, in particular with regard to the expression patterns. Indeed, these patterns need to cover the entire period of sex lability and have to be associated to future sex phenotypes, usually impossible to establish in this sequential hermaphrodite. This is why we performed a gonadal RNA-Seq analysis of diploid male and female oysters that have not changed sex for 4 years, sampled during the entire time-window of sex determination/early sex differentiation (stages 0 and 3 of the gametogenetic cycle). This individual long-term monitoring gave us the opportunity to explain the molecular expression patterns in the light of the most statistically likely future sex of each oyster. RESULTS: The differential gene expression analysis of gonadal transcriptomes revealed that 9723 genes were differentially expressed between gametogenetic stages, and 141 between sexes (98 and 43 genes highly expressed in females and males, respectively). Eighty-four genes were both stage- and sex-specific, 57 of them being highly expressed at the time of sex determination/early sex differentiation. These 4 novel genes including Trophoblast glycoprotein-like, Protein PML-like, Protein singed-like and PREDICTED: paramyosin, while being supported by RT-qPCR, displayed sexually dimorphic gene expression patterns. CONCLUSIONS: This gonadal transcriptome analysis, the first one associated with sex phenotypes in C. gigas, revealed 57 genes highly expressed in stage 0 or 3 of gametogenesis and which could be linked to the future sex of the individuals. While further study will be needed to suggest a role for these factors, some could certainly be original potential actors involved in sex determination/early sex differentiation, like paramyosin and could be used to predict the future sex of oysters.
Keywords: Animals; Crassostrea; Female; Gene Expression Profiling; Gonads; Humans; Male; Phenotype; Phylogeny; Sex Differentiation; Transcriptome

Greenhouse gas emissions (CO2 and CH4) and inorganic carbon behavior in an urban highly polluted tropical coastal lagoon (SE, Brazil) - Cotovicz, Luiz C.; Ribeiro, Renato P.; Régis, Carolina Ramos; Bernardes, Marcelo; Sobrinho, Rodrigo; Vidal, Luciana Oliveira; Tremmel, Daniel; Knoppers, Bastiaan A.; Gwenaël Abril (Environmental Science and Pollution Research, 2021)

High and rising economic costs of biological invasions worldwide - Diagne, Christophe; Leroy, Boris; Vaissière, Anne-Charlotte; Gozlan, Rodolphe E.; Roiz, David; Jarić, Ivan; Salles, Jean-Michel; Bradshaw, Corey J. A.; Courchamp, Franck (Nature, 2021)

How many fish could be vocal? An estimation from a coral reef (Moorea Island) - Parmentier, Eric; Frédéric Bertucci; Bolgan, Marta; Lecchini, David (Belgian Journal of Zoology, 2021)

Identification of benthic egg masses and spawning grounds in commercial squid in the English Channel and Celtic Sea: Loligo vulgaris vs L. forbesii - Laptikhovsky, Vladimir; Cooke, Gavan; Barrett, Christopher; Lozach, Sophie; MacLeod, Eleanor; Oesterwind, Daniel; Sheerin, Edel; Petroni, Michael; Barnwall, Leigh; Jean-Paul Robin; Allcock, Louise; Power, Anne Marie (Fisheries Research, 2021)

Impacts of climate change on the Bay of Seine ecosystem: Forcing a spatio‐temporal trophic model with predictions from an ecological niche model - Bourdaud, Pierre; Ben Rais Lasram, Frida; Araignous, Emma; Champagnat, Juliette; Grusd, Samantha; Halouani, Ghassen; Hattab, Tarek; Leroy, Boris; Nogues, Quentin; Raoux, Aurore; Safi, Georges; Nathalie Niquil (Fisheries Oceanography, 2021)

Influence des perturbations anthropiques sur les communautés de petits mammifères des savanes gabonaises - Mboumba, Jean-François; Momboua, Brice Roxan; Perin, Eline; Frédéric Ysnel (International Journal of Biological and Chemical Sciences, 2021)

Influence of environmental conditions on the distribution of burrows of the mud crab, Scylla serrata, in a fringing mangrove ecosystem - Leoville, Alexandre; Lagarde, Raphaël; Grondin, Henri; Faivre, Laëtitia; Rasoanirina, Elisa; Teichert, Nils (Regional Studies in Marine Science, 2021)
Mud crab, Scylla serrata, is a common mangrove species in the Indian Ocean. Over the last decades, fishing pressure has greatly increased especially in Madagascar. Therefore, improving the knowledge of mud crab biology and ecology is crucial to guide conservation and restoration plans. This study aimed at describing the distribution of burrows of the mud crab in a mangrove in southwestern Madagascar. Burrows fulfill an essential functional role by limiting the exposure of crab to environmental stress, such as desiccation during low tide, and predation. A total of 140 burrows were observed and available conditions were described at 168 random sampling points at low tide in three different mangrove zones, during the dry season (July 2014). Twelve environmental factors were recorded to reflect the position within the mangrove, the substrate composition and the surrounding floristic structure. A multivariate ordination analysis highlighted an overall association between burrows and specific habitat conditions. Boosted regression trees then indicated that the burrows distribution was predominantly explained by the avoidance of hard substrates. The occurrence of burrows was positively related to the upper intertidal zone of the mangrove where the water level was below 100 cm. Although the tree density had a positive effect, the occurrence of burrows was higher for low percentage of shade (<40%). These results provide insight for identifying mangrove areas that have an essential functional role for the conservation of mud crab populations.
Keywords: Crustacean; Floristic structure; Habitat conditions; Mangrove crab; Substratum composition

Influence of infrastructure material composition and microtopography on marine biofilm growth and photobiology - Vivier, Baptiste; Pascal Claquin; Lelong, Christophe; Lesage, Quentin; Peccate, Mathias; Hamel, Bastien; Georges, Marine; Bourguiba, Amel; Sebaibi, Nassim; Boutouil, Mohamed; Goux, Didier; Dauvin, Jean-Claude; et al. (Biofouling, 2021)

Interactions between Filter-Feeding Bivalves and Toxic Diatoms: Influence on the Feeding Behavior of Crassostrea gigas and Pecten maximus and on Toxin Production by Pseudo-nitzschia - Sauvey, Aurore; Denis, Françoise; Hégaret, Hélène; Le Roy, Bertrand; Lelong, Christophe; Jolly, Orianne; Pavie, Marie; Juliette Fauchot (Toxins, 2021)

Interdependence of thyroid and corticosteroid signalling in vertebrate developmental transitions - Karine Rousseau; Sylvie Dufour; Sachs, Laurent M (Frontiers in Ecology and Evolution, 2021)

Interstitial Annelida - Worsaae, Katrine; Kerbl, Alexandra; Domenico, Maikon Di; Gonzalez, Brett C.; Bekkouche, Nicolas; Martínez, Alejandro (Diversity, 2021)

Involvement of RFamide neuropeptides in polyp contraction of the adult scleractinian corals Euphyllia ancora and Stylophora pistillata - Zhang, Yan; Shikina, Shinya; Ho, Yu-Ying; Chiu, Yi-Ling; I-Chen Yao, Jack; Céline Zatylny-Gaudin; Sylvie Dufour; Chang, Ching-Fong (General and Comparative Endocrinology, 2021)

Involvement of Transforming Growth Factor Beta family genes in gonadal differentiation in Japanese eel, Anguilla japonica, according to sex-related gene expressions - Lin, Chien-Ju; Jeng, Shan-Ru; Lei, Zhen-Yuan; Yueh, When-Shiun; Sylvie Dufour; Wu, Guan-Chung; Chang, Ching-Fong (Cells, 2021)

Isolation-by-distance and male-biased dispersal at a fine spatial scale: a study of the common European adder (Vipera berus) in a rural landscape - François, Donatien; Ursenbacher, Sylvain; Boissinot, Alexandre; Frédéric Ysnel; Lourdais, Olivier (Conservation Genetics, 2021)

Kakila database: Towards a FAIR community approved database of cetacean presence in the waters of the Guadeloupe archipelago based on citizen science - Coché, Lorraine; Arnaud, Elie; Bouveret, Laurent; David, Romain; Foulquier, Eric; Gandilhon, Nadège; Jeannesson, Etienne; Le Bras, Yvan; Lerigoleur, Emilie; Pascal Jean Lopez; Madon, Bénédicte; Sananikone, Julien; et al. (Biodiversity Data Journal, 2021)

La protection des milieux aquatiques. Vulnérabilité et sensibilité fonctionnelle des communautés de poissons - Teichert, Nils; Lepage, Mario; Hette-Tronquart, Nicolas; Argillier, Christine (Sciences Eaux & Territoires, 2021)
Les approches en écologie fonctionnelle ouvrent aujourd’hui de nouvelles perspectives dans le domaine du diagnostic écologique. C’est le cas par exemple du critère de la redondance fonctionnelle que les auteurs de cet article ont appliqué aux communautés de poissons pour évaluer leur sensibilité fonctionnelle à la perte d’espèces, et au-delà, mesurer l’influence d’un déclin potentiel de diversité sur le fonctionnement de l’écosystème. L’intégration de ce type d’indice, en complément des critères habituels, est utile pour définir des plans de gestion ou des sites prioritaires à protéger face à des perturbations environnementales, en se concentrant sur les processus écosystémiques.

Levels of genetic differentiation and gene flow between four populations of the Scaly-naped Pigeon, Patagioenas squamosa: implications for conservation - Cambrone, Christopher; Cézilly, Frank; Wattier, Rémi; Eraud, Cyril; Bezault, Etienne (Studies on Neotropical Fauna and Environment, 2021)

Links between introduced fish and zooplanktonic and zoobenthic food sources in the food webs of two reservoirs of a semi-arid zone in Algeria - Djezzar, M; Mortillaro, JM; Doumandji, SE; Tarik Meziane (African Journal of Aquatic Science, 2021)
Few studies have focused on the trophic functioning of the reservoirs in Algeria. The study of the gut contents of fish species, as well as the analysis of the stable isotopes of 13C and 15N in the environment, were carried out on samples collected during spring 2010 in two reservoirs: Ghrib and Harreza of the upper Cheliff plain (Algeria) within a semi-arid climate zone. In each of the reservoirs, 13C and 15N were measured in sediments, particulate organic matter (POM), macrophytes, zooplankton, zoobenthos and fish. The isotopic analysis shows that the carbon values that supply both reservoirs, Ghrib and Harreza, were −31.16 ± 0.05 < 13C < −18.01 ± 0.21‰ and −30.82 ± 0.07 < 13C < −17.24 ± 3.50‰, respectively. The carnivorous fish Sander lucioperca, and Abramis brama, an omnivorous fish, were allocated to the top of the food web in Ghrib and Harreza reservoirs, respectively. In the latter, a reservoir with low hydrodynamism and depth, the food web is simpler with a single fish species, which benefits from both benthic and pelagic sources. In Ghrib, a deeper dam with stronger hydrodynamics, only the riverine crab Potamon algeriense exploits the benthic sources, whereas fish mainly feed on zooplankton

Local perceptions of socio-ecological drivers and effects of coastal armoring: the case of Moorea, French Polynesia - Calandra, Maëlle; Wencélius, Jean; Madi Moussa, Rakamaly; Gache, Camille; Berthe, Cécile; Waqalevu, Viliame; Ung, Pascal; Lerouvreur, Franck; Bambridge, Tamatoa; Galzin, René; Frédéric Bertucci; Lecchini, David (Population and Environment, 2021)

Long term relationship between farming damselfish, predators, competitors and benthic habitat on coral reefs of Moorea Island - Feeney, William E.; Frédéric Bertucci; Gairin, Emma; Siu, Gilles; Waqalevu, Viliame; Antoine, Morgan; Lison de Loma, Thierry; Planes, Serge; Galzin, René; Lecchini, David (Scientific Reports, 2021)

Marine artificial reefs, a meta-analysis of their design, objectives and effectiveness - Vivier, Baptiste; Dauvin, Jean-Claude; Navon, Maxime; Anne-Marie Rusig; Isabelle Mussio; Francis Orvain; Boutouil, Mohamed; Pascal Claquin (Global Ecology and Conservation, 2021)

Marine biodiversity of a pristine coral reef in French Polynesia - Lecchini, David; Frédéric Bertucci; Fogg, Lily; Gache, Camille; Ung, Pascal; Lacube, Yann; Berthe, Cécile; Waqalevu, Viliame; Siu, Alain; Bambridge, Tamatoa (Island Studies Journal, 2021)

Marine Transcriptomic Analysis for the Identification of New Antimicrobial Peptides - Houyvet, Baptiste; Bouchon-Navaro, Yolande; Bouchon, Claude; Corre, Erwan; Céline Zatylny-Gaudin (Marine Drugs, 2021)

Maturity of a giant: age and size reaction norm for sexual maturity for Atlantic leatherback turtles - Girondot, Marc; Mourrain, Baptiste; Chevallier, Damien; Godfrey, Matthew H. (Marine Ecology, 2021)

Melatonin and osmoregulation in fish: A focus on Atlantic salmon Salmo salar smoltification - Nisembaum, Laura Gabriela; Martin, Patrick; Lecomte, Frédéric; Falcón, Jack (Journal of Neuroendocrinology, 2021)
Part of the life cycle of several fish species includes important salinity changes, as is the case for the sea bass (Dicentrarchus labrax) or the Atlantic salmon (Salmo salar). Salmo salar juveniles migrate downstream from their spawning sites to reach seawater, where they grow and become sexually mature. The process of preparation enabling juveniles to migrate downstream and physiologically adapt to seawater is called smoltification. Daily and seasonal variations of photoperiod and temperature play a role in defining the timing of smoltification, which may take weeks to months, depending on the river length and latitude. Smoltification is characterised by a series of biochemical, physiological and behavioural changes within the neuroendocrine axis. This review discusses the current knowledge and gaps related to the neuroendocrine mechanisms that mediate the effects of light and temperature on smoltification. Studies performed in S. salar and other salmonids, as well as in other species undergoing important salinity changes, are reviewed, and a particular emphasis is given to the pineal hormone melatonin and its possible role in osmoregulation. The daily and annual variations of plasma melatonin levels reflect corresponding changes in external photoperiod and temperature, which suggests that the hormonal time‐keeper melatonin might contribute to controlling smoltification. Here, we review studies on (i) the impact of pinealectomy and/or melatonin administration on smoltification; (ii) melatonin interactions with hormones involved in osmoregulation (e.g., prolactin, growth hormone and cortisol); (iii) the presence of melatonin receptors in tissues involved in osmoregulation; and (iv) the impacts of salinity changes on melatonin receptors and circulating melatonin levels. Altogether, these studies show evidence indicating that melatonin interacts with the neuroendocrine pathways controlling smoltification, although more information is needed to clearly decipher its mechanisms of action.

The Merits of Loop Analysis for the Qualitative Modeling of Social-Ecological Systems in Presence of Offshore Wind Farms - Nathalie Niquil; Scotti, Marco; Fofack-Garcia, Rhoda; Haraldsson, Matilda; Thermes, Maud; Raoux, Aurore; Le Loc'h, Francois; Mazé, Camille (Frontiers in Ecology and Evolution, 2021)

Molecular and cellular regulation on sex change in hermaphroditic fish, with a special focus on protandrous black porgy, Acanthopagrus schlegelii. - Wu, Guan-Chung; Sylvie Dufour; Chang, Ching-Fong (Mol Cell Endocrinol, 2021)
In teleost fish, sex can be determined by genetic factors, environmental factors, or both. Unlike in gonochoristic fish, in which sex is fixed in adults, sex can change in adults of hermaphroditic fish species. Thus, sex is generated during the initial gonadal differentiation stage (primary sex differentiation) and later during sexual fate alternation (secondary sex differentiation) in hermaphroditic fish species. Depending on the species, sex phase alternation can be induced by endogenous cues (such as individual age and body size) or by social cues (such as sex ratio or relative body size within the population). In general, the fluctuation in plasma estradiol-17β (E2) levels is correlated with the sexual fate alternation in hermaphroditic fish. Hormonal treatments can artificially induce sexual phase alternation in sequential hermaphroditic fishes, but in a transient and reversible manner. This is the case for the E2-induced female phase in protandrous black porgy and the methyltestosterone (MT)- or aromatase inhibitor (AI)-induced male phase in protogynous grouper. Recent reviews have focused on the different forms of sex change in fish who undergo sequential sex change, especially in terms of gene expression and the role of hormones. In this review, we use the protandrous black porgy, a nonsocial cue-influenced hermaphroditic species, with digonic gonads (ovarian and testis separated by a connective tissue), as a model to describe our findings and discuss the molecular and cellular regulation of sexual fate determination in hermaphroditic fish.

Molecular and physiological characterization of a crustacean cardioactive signaling system in a lophotrochozoan - the Pacific oyster (Crassostrea gigas): a role in reproduction and salinity acclimation. - Réalis-Doyelle, Emilie; Julie Schwartz; Marie-Pierre Dubos; Pascal Favrel (J Exp Biol, 2021)
The crustacean cardioactive peptide (CCAP) is an important neuropeptide involved in the regulation of a variety of physiological processes in arthropods. Although this family of peptides has an ancestral origin, its function remains poorly understood among protostome species - apart from arthropods. We functionally characterized three G protein-coupled receptors (GPCRs) in the oyster Crassostrea gigas, phylogenetically related to ecdysozoan CCAP receptors (CCAPRs) and to chordate neuropeptide S receptors (NPSRs). Cragi-CCAPR1 and Cragi-CCAPR2 were specifically activated by the Cragi-CCAP1 and Cragi-CCAP2 peptides, respectively, both derived from the same CCAP precursor. In contrast, Cragi-CCAPR3 was only partially activated by CCAP1 and CCAP2 at high concentrations. The Cragi-CCAPR1 and Cragi-CCAPR2 genes were expressed in various adult tissues. They are both most expressed in the gills, while Cragi-CCAPR3 is mainly expressed in the visceral ganglia (VG). Cragi-CCAP precursor transcripts are higher in the VG, the labial palps and the gills. Receptor and ligand-encoding transcripts are more abundantly expressed in the gonads in the first stages of gametogenesis, while the Cragi-CCAP precursor is upregulated in the VG in the last stages of gametogenesis. This suggests a role of the CCAP signaling system in the regulation of reproductive processes. A role in water and ionic regulation is also supported considering the differential expression of the CCAP signaling components in oysters exposed to brackish water.

Morphostructural data and phylogenetic relationships of a new cnidarian myxosporean infecting spleen of an economic and ecological important bryconid fish from Brazil - Milanin, Tiago; Mathews, Patrick D.; Morandini, André C.; Mertins, Omar; Audebert, Fabienne; Pereira, Jose O.L.; Maia, Antonio A.M. (Microbial Pathogenesis, 2021)

Multi-trophic markers illuminate the understanding of the functioning of a remote, low coral cover Marquesan coral reef food web - Fey, Pauline; Parravicini, Valeriano; Bănaru, Daniela; Dierking, Jan; Galzin, René; Lebreton, Benoît; Tarik Meziane; Polunin, Nicholas V. C.; Zubia, Mayalen; Letourneur, Yves (Scientific Reports, 2021)
We studied the food web structure and functioning of a coral reef ecosystem in the Marquesas Islands, French Polynesia, characterized by low coral cover, high sea surface temperature and meso- to eutrophic waters. The Marquesas constitute a relevant ecosystem to understand the functioning of low diversity reefs that are also subject to global change. A multi-tracer assessment of organic matter pathways was run to delineate ecosystem functioning, using analysis of fatty acids, bulk and compound specific stable isotope analysis and stable isotopes mixing models. Macroalgae and phytoplankton were the two major food sources fueling this food web with, however, some marked seasonal variations. Specifically, zooplankton relied on phytoplankton-derived organic matter and herbivorous fishes on macroalgae-derived organic matter to a much higher extent in summer than in winter (~ 75% vs. ~ 15%, and ~ 70 to 75% vs. ~ 5 to 15%, respectively) . Despite remarkably high δ15N values for all trophic compartments, likely due to local dynamics in the nitrogen stock, trophic levels of consumers were similar to those of other coral reef ecosystems. These findings shed light on the functioning of low coral cover systems, which are expected to expand worldwide under global change.

Mytilus edulis and Styela clava assimilate picophytoplankton carbon through feces and pseudofeces ingestion - Sonier, R.; Comeau, L.A.; Tremblay, R.; Frédéric Olivier; Tarik Meziane; Genard, B. (Aquaculture, 2021)
Picophytoplankton (PPP) may contribute to the bulk of primary production in nutrient-rich marine ecosystems. In this study, we quantified the capacity of blue mussels (Mytilus edulis) and clubbed tunicates (Styela clava) to exploit PPP. In the water, we introduced PPP cells that were isotopically labelled with 13C and using the same enrichment approach, we measured the secondary transfer (recycling) of carbon via the assimilation of pseudofeces and feces. Results show that both M. edulis and S. clava assimilate PPP carbon by ingesting PPP cells directly from water. In addition, PPP assimilation rates were similar in both species. Most interesting was our observation that both species assimilated PPP carbon contained in pseudofeces and feces, including large fecal pellets produced by S. clava. We conclude that within cultured and invasive filter feeders, PPP carbon is recycled via ingestion of feces and pseudofeces among individuals growing in close proximity. In aquaculture settings, cultured bivalves and fouling tunicates may provide an ecological service by removing excess PPP in nutrient-rich systems via direct and secondary ingestion. Keywords: Picophytoplankton, Isotopic labelling, Aquaculture, Feces, Carbon cycling, Blue mussel, Tunicate

New Insights on Biodiversity and Conservation of Amphidromous Shrimps of the Indo-Pacific islands (Decapoda: Atyidae: Caridina) - de Mazancourt, V.; Klotz, W.; Marquet, G.; Mos, B.; Rogers, D.C.; Keith, P. (Recent Advances in Freshwater Crustacean Biodiversity and Conservation, 2021)
Amphidromous shrimps of the genus Caridina (Crustacea: Decapoda: Atyidae) are essential components of the tropical insular freshwater ecosystems. Due to an extremely confused taxonomy, their biodiversity is poorly known and their conservation status cannot be properly assessed. However, thanks to recent advances in integrative taxonomy, the systematics of this genus progressively becomes clearer, allowing us to draw conclusions about their biogeography and conservation biology. In this chapter, we (1) review the current state of knowledge of amphidromous Caridina diversity in the light of the latest results of integrative taxonomy, (2) review the threats faced by Caridina in Indo-Pacific Islands, and (3) discuss how integrative taxonomic approaches can inform and support programs designed to limit the impacts of threatening processes on the diversity of Caridina. Finally, we provide recommendations for the conservation of these species and their habitats.

New Insights on Biodiversity and Conservation of Amphidromous Shrimps of the Indo-Pacific islands (Decapoda: Atyidae: Caridina) - de Mazancourt, V.; Klotz, W.; Marquet, G.; Mos, B.; Rogers, D.C.; Keith, P. (Recent Advances in Freshwater Crustacean Biodiversity and Conservation, 2021)
Amphidromous shrimps of the genus Caridina (Crustacea: Decapoda: Atyidae) are essential components of the tropical insular freshwater ecosystems. Due to an extremely confused taxonomy, their biodiversity is poorly known and their conservation status cannot be properly assessed. However, thanks to recent advances in integrative taxonomy, the systematics of this genus progressively becomes clearer, allowing us to draw conclusions about their biogeography and conservation biology. In this chapter, we (1) review the current state of knowledge of amphidromous Caridina diversity in the light of the latest results of integrative taxonomy, (2) review the threats faced by Caridina in Indo-Pacific Islands, and (3) discuss how integrative taxonomic approaches can inform and support programs designed to limit the impacts of threatening processes on the diversity of Caridina. Finally, we provide recommendations for the conservation of these species and their habitats.

A new species of freshwater pipefish (Teleostei: Syngnathidae: Coelonotus) from Papua New Guinea - Vincent Haÿ; Marion Mennesson; Philippe Keith; Clara Lord (Cybium, 2021)
A new species of Coelonotus, a freshwater pipefish, is described on the basis of six specimens from the Gavuvu river of West new Britain Island (Papua new Guinea). It differs from other Coelonotus species by a combination of morphomeristic values including: number of dorsal fin rays (45-47), number of subdorsal (4-5) and tail rings (35-37). the Folmer dna barcode fragment of the COI mitochondrial gene shows that this new species is indeed a different genetic lineage from other Coelonotus species of this area.

A new species of Microphis (Teleostei: Syngnathidae) from Papua New Guinea. - Haÿ, Vincent; Marion Mennesson; Philippe Keith; Clara Lord (Cybium, 2021)

A new species of Schismatogobius (Teleostei: Gobiidae) from Sulawesi (Indonesia). - Philippe Keith; Sauri, S; Busson, Frederic; Delrieu-Trottin, Erwan (Cybium, 2021)

New taxonomic and phylogeographic data on three nominal species of the genus Septaria Férussac, 1807 (Gastropoda: Cycloneritida: Neritidae) - Ahmed Abdou (Zootaxa, 2021)
Due to superficial morphological similarities, there is often confusion in the identification of some species of the genus Septaria. A combined analysis of the genital anatomy, morphometric and DNA, based on a portion of the COI gene, applied to three nominal species of this genus, confirmed the validity of Septaria tahitiana Eichhorst, 2016, and suggested that Septaria borbonica (Bory de Saint Vincent, 1804) is a subspecies of Septaria porcellana (Linnaeus, 1758), both taxa with disjunct distribution areas: Septaria borbonica in the western Indian Ocean and Septaria porcellana the western Pacific and eastern Indian Oceans. The possible presence of Septaria tesselata (Lamarck, 1816) in Mayotte (Comoros Archipelago) needs to be confirmed.
Keywords: Indo-Pacific; mitochondrial DNA; mollusc; Phylogeny; shell morphometrics; taxonomy

North Atlantic warming over six decades drives decreases in krill abundance with no associated range shiftAbstract - Martin Edwards; Pierre Hélaouët; Goberville, Eric; Lindley, Alistair; Tarling, Geraint A.; Burrows, Michael T.; Angus Atkinson (Communications Biology, 2021)
In the North Atlantic, euphausiids (krill) form a major link between primary production and predators including commercially exploited fish. This basin is warming very rapidly, with species expected to shift northwards following their thermal tolerances. Here we show, however, that there has been a 50% decline in surface krill abundance over the last 60 years that occurred in situ, with no associated range shift. While we relate these changes to the warming climate, our study is the first to document an in situ squeeze on living space within this system. The warmer isotherms are shifting measurably northwards but cooler isotherms have remained relatively static, stalled by the subpolar fronts in the NW Atlantic. Consequently the two temperatures defining the core of krill distribution (7–13 °C) were 8° of latitude apart 60 years ago but are presently only 4° apart. Over the 60 year period the core latitudinal distribution of euphausiids has remained relatively stable so a ‘habitat squeeze’, with loss of 4° of latitude in living space, could explain the decline in krill. This highlights that, as the temperature warms, not all species can track isotherms and shift northward at the same rate with both losers and winners emerging under the ‘Atlantification’ of the sub-Arctic.

A Novel Dop2/Invertebrate-Type Dopamine Signaling System Potentially Mediates Stress, Female Reproduction, and Early Development in the Pacific Oyster (Crassostrea gigas) - Schwartz, Julie; Réalis-Doyelle, Emilie; Le Franc, Lorane; Favrel, Pascal (Marine Biotechnology, 2021)

Observations of Sea Lampreys, attached to Humpback whales, off Saint Pierre and Miquelon archipelago (Northwestern Atlantic) - Urtizberea, Frank; Detcheverry, Joël; Denys, Gaël (Cahiers de Biologie Marine, 2021)
We report the two first observations of Sea Lampreys Petromyzon marinus attached to Humpback whales Megaptera novaeangliae during two whales surveys by boat the 5th September 2012 and 8th July 2020. Their size and marbled coloration certified their species identification. However, the lack of scarring does not allow to affirm a parasite/host relationship. These observations are also the first occurrences of this lamprey species in the exclusive economic zone of the French territory of Saint Pierre and Miquelon archipelago, and will be helpful for French managers.

Observations of sharks (Elasmobranchii) at Europa Island, a remote marine protected area important for shark conservation in the southern Mozambique Channel - Mireille M.M. Guillaume; Séret, Bernard (PLOS ONE, 2021)

Pelagic habitats under the MSFD D1: scientific advice of policy relevance : recommendations to frame problems and solutions for the pelagic habitats’ assessment. - Magliozzi, Chiara; Druon, Jean-Noel; Palialexis, Andreas; Aguzzi, Laura; Alexande, Brittany; Antoniadis, Konstantinos; Artigas, Luis Felipe; Azzellino, Arianna; Bisinicu, Elena; Boicenco, Laura; Bojanic, Natalia; Borrello, Patrizia; et al. (Publications Office of the European Union, 2021)
Pelagic habitats are a policy priority below Descriptor 1 (Biodiversity) of the Marine Strategy Framework Directive (MSFD). They are addressed under the D1C6 criterion, stating “the condition of the habitat type, including its biotic and abiotic structure and its functions…, is not adversely affected due to anthropogenic pressures”. The evaluation of pelagic habitats status is challenged by the functional and structural characteristics of pelagic habitat diversity and processes. To date, pelagic habitats assessments are lacking in common criteria and methodologies that characterize the habitat while accounting for the effects of anthropogenic pressures to achieve the Good Environmental Status (GES). It is therefore necessary to prioritise communication between scientific and policy communities and frame pelagic research to agree on common methods and approaches at regional or EU scale. This is key for achieving harmonised and comparable pelagic assessments for the MSFD. This report summarizes the outcomes on the assessment workflow of pelagic habitats of the JRC “MSFD pelagic habitats” workshop (9th and 10th March 2021), and the need for coordinated evaluations of the scientific challenges of policy relevance. Recommendations on the MSFD implementation of D1C6, that were generated from the experts during the workshop, will be communicated to the MSFD policy groups and the EU Member States competent authorities to support future harmonised assessment of pelagic habitats.

Photoperiodic regulation of pituitary thyroid-stimulating hormone and brain deiodinase in Atlantic salmon - Irachi, Shotaro; Hall, Daniel J.; Fleming, Mitchell S.; Maugars, Gersende; Björnsson, Björn Thrandur; Sylvie Dufour; Uchida, Katsuhisa; McCormick, Stephen D. (Molecular and Cellular Endocrinology, 2021)

Photosynthesis from stolen chloroplasts can support sea slug reproductive fitness - Cartaxana, Paulo; Rey, Felisa; LeKieffre, Charlotte; Lopes, Diana; Cédric Hubas; Spangenberg, Jorge E.; Escrig, Stéphane; Bruno Jesus; Calado, Gonçalo; Domingues, Rosário; Kühl, Michael; Calado, Ricardo; et al. (Proceedings of the Royal Society B: Biological Sciences, 2021)
Some sea slugs are able to steal functional chloroplasts (kleptoplasts) from their algal food sources, but the role and relevance of photosynthesis to the animal host remain controversial. While some researchers claim that kleptoplasts are slowly digestible ‘snacks’, others advocate that they enhance the overall fitness of sea slugs much more profoundly. Our analysis shows light-dependent incorporation of 13C and 15N in the albumen gland and gonadal follicles of the sea slug Elysia timida, representing translocation of photosynthates to kleptoplast-free reproductive organs. Long-chain polyunsaturated fatty acids with reported roles in reproduction were produced in the sea slug cells using labelled precursors translocated from the kleptoplasts. Finally, we report reduced fecundity of E. timida by limiting kleptoplast photosynthesis. The present study indicates that photosynthesis enhances the reproductive fitness of kleptoplast-bearing sea slugs, confirming the biological relevance of this remarkable association between a metazoan and an algal-derived organelle.

Phylogenetic analysis and characterization of a new parasitic cnidarian (Myxosporea: Myxobolidae) parasitizing skin of the giant mottled eel from the Solomon Islands - Mathews, Patrick D.; Bonillo, Céline; Rabet, Nicolas; Clara Lord; Causse, Romain; Philippe Keith; Audebert, Fabienne (Infection, Genetics and Evolution, 2021)

Pituitary Hormones mRNA Abundance in the Mediterranean Sea Bass Dicentrarchus labrax: Seasonal Rhythms, Effects of Melatonin and Water Salinity - Jack Falcon (Frontiers in Physiology, 2021)
In fish, most hormonal productions of the pituitary gland display daily and/or seasonal rhythmic patterns under control by upstream regulators, including internal biological clocks. The pineal hormone melatonin, one main output of the clocks, acts at different levels of the neuroendocrine axis. Melatonin rhythmic production is synchronized mainly by photoperiod and temperature. Here we aimed at better understanding the role melatonin plays in regulating the pituitary hormonal productions in a species of scientific and economical interest, the euryhaline European sea bass Dicentrarchus labrax. We investigated the seasonal variations in mRNA abundance of pituitary hormones in two groups of fish raised one in sea water (SW fish), and one in brackish water (BW fish). The mRNA abundance of three melatonin receptors was also studied in the SW fish. Finally, we investigated the in vitro effects of melatonin or analogs on the mRNA abundance of pituitary hormones at two times of the year and after adaptation to different salinities. We found that (1) the reproductive hormones displayed similar mRNA seasonal profiles regardless of the fish origin, while (2) the other hormones exhibited different patterns in the SW vs. the BW fish. (3) The melatonin receptors mRNA abundance displayed seasonal variations in the SW fish. (4) Melatonin affected mRNA abundance of most of the pituitary hormones in vitro; (5) the responses to melatonin depended on its concentration, the month investigated and the salinity at which the fish were previously adapted. Our results suggest that the productions of the pituitary are a response to multiple factors from internal and external origin including melatonin. The variety of the responses described might reflect a high plasticity of the pituitary in a fish that faces multiple external conditions along its life characterized by marked daily and seasonal changes in photoperiod, temperature and salinity.
Keywords: annual variations; hormones; melatonin; photoperiod; pituitary; salinity; sea bass

Prokaryotic abundance, cell size and extracellular enzymatic activity in a human impacted and mangrove dominated tropical estuary (Can Gio, vietnam) - Frank David; Tarik Meziane; Marchand, Cyril; Rolland, Guillaume; Pham, Aurélie; Thanh-Nho, Nguyen; Lamy, Dominique (Estuarine, Coastal and Shelf Science, 2021)
Extracellular enzymatic activities constitute the first and limiting step of the whole process of organic matter (OM) cycling in aquatic ecosystems. This study aims to identify the factors controlling prokaryotes ability to hydrolyse OM in an Indo-Pacific tropical mangrove ecosystem (Can Gio, Vietnam). Prokaryotic abundance and leucine-aminopeptidase exo-proteolytic activity (EPA) were measured at vertical (from the sea-surface microlayer to bottom waters), spatial (along a transect within the estuary) and seasonal (wet and dry season) scales. Prokaryotic abundance ranged from 1.2 to 5.7 × 109 cells L−1 and EPA ranged from 24 to 505 nmol L−1 h−1 that was relatively similar to other highly productive ecosystems. The estuary was poorly stratified, most probably because of high water turbulence. Yet, exo-proteolytic activity was significantly higher in bottom waters, where higher loads of suspended particulate matter were measured. Seasonal and spatial differences in EPA suggest that the nature of OM transported by the Can Gio mangrove estuary affect EPA. The latter seems to be increased by two “uncommon” situations: the input of fresh and labile OM (e.g. shrimp farm effluents) or the lack of labile OM and the need to hydrolyse refractory compounds (e.g. during the dry season).

Quantifying Cyanothece growth under DIC limitation - Inomura, Keisuke; Masuda, Takako; Eichner, Meri; Rabouille, Sophie; Zavřel, Tomas; Červený, Jan; Vancová, Marie; Bernát, Gabor; Armin, Gabrielle; Pascal Claquin; Kotabová, Eva; Stephan, Susanne; et al. (Computational and Structural Biotechnology Journal, 2021)

Recent Advances in Freshwater Crustacean Biodiversity and ConservationNew Insights on Biodiversity and Conservation of Amphidromous Shrimps of the Indo-Pacific islands (Decapoda: Atyidae: Caridina) - Kawai, Tadashi; Rogers, D. Christopher; Mazancourt, V. de; Klotz, W.; Marquet, G.; Mos, B.; Rogers, D.C.; Philippe Keith (CRC Press, 2021)

Revalidation of the Spanish stone loach Barbatula hispanica (Lelek, 1987) (Teleostei, Nemacheilidae) according to morphological and mitochondrial data - Denys, Gaël; Perea, Silvia; Dettai, Agnès; Gauliard, Camille; Persat, Henri; Doadrio, Ignacio (Annales de Limnologie - International Journal of Limnology, 2021)

Review of Ophiocara (Teleostei: Butidae) from Indo-pacific Islands. - Philippe Keith; Marion Mennesson (Cybium, 2021)

Review of Ophiocara (Teleostei: Butidae) from Indo-Pacific Islands - Philippe Keith; Marion Mennesson (Cybium, 2021)
Révision du genre Ophiocara (Teleostei : Butidae) de la région indopacifique /Review of Ophiocara (Teleostei: Butidae) from Indo-Pacific Islands Des collections de spécimens des Ophiocara provenant de la région indopacifique ont été étudiées. Trois espèces ont été répertoriées selon des approches génétiques et morpho-méristiques. Elles diffèrent par un fort pourcentage de divergence au niveau du gène COI partiel (446 pb) et par plusieurs caractères incluant, principalement, le nombre d’écailles en séries latérale, transverse postérieure, zigzag et prédorsale, et par la longueur de la mâchoire. Ophiocara species from the Indo-Pacific area are reviewed. Three species are recognized using genetic and morphomeristic approaches. The species differ by a high percentage of divergence (around 8%) in partial COI gene (446 bp) and by several characters including the number of scales in lateral, transverse backward, zigzag, and predorsal series, and the jaw length.

Revisiting species and areas of interest for conserving global mammalian phylogenetic diversity - Robuchon, Marine; Pavoine, Sandrine; Véron, Simon; Delli, Giacomo; Faith, Daniel P.; Mandrici, Andrea; Pellens, Roseli; Dubois, Grégoire; Leroy, Boris (Nature Communications, 2021)

The rise and fall of the ancient northern pike master sex-determining gene - Pan, Qiaowei; Feron, Romain; Jouanno, Elodie; Darras, Hugo; Herpin, Amaury; Koop, Ben; Rondeau, Eric; Goetz, Frederick W; Larson, Wesley A; Bernatchez, Louis; Tringali, Mike; Curran, Stephen S; et al. (eLife, 2021)

Saint-Paul and Amsterdam rock lobster stocks Harvest Control Rule - Jules, Selles (2021)

Sargassum contamination and consequences for downstream uses: a review - Devault, Damien A.; Pierre, Ronan; Marfaing, Hélène; Dolique, Franck; Pascal Jean Lopez (Journal of Applied Phycology, 2021)

Sargassum Differentially Shapes the Microbiota Composition and Diversity at Coastal Tide Sites and Inland Storage Sites on Caribbean Islands - Hervé, Vincent; Lambourdière, Josie; René-Trouillefou, Malika; Devault, Damien Alain; Pascal Jean Lopez (Frontiers in Microbiology, 2021)

Sargassum Differentially Shapes the Microbiota Composition and Diversity at Coastal Tide Sites and Inland Storage Sites on Caribbean Islands - Hervé, Vincent; Josie Lambourdière; René-Trouillefou, Malika; Devault, Damien Alain; Pascal Jean Lopez (Front Microbiol, 2021)
Rafts of drifting pelagic that are circulating across the Atlantic Ocean are complex ecosystems composed of a large number of associated species. Upon massive stranding, they lead to various socio-environmental issues including the inflow of contaminants and human health concerns. In this study, we used metabarcoding approaches to examine the differences in both the eukaryotic- and prokaryotic-associated communities from present in two islands of the Lesser Antilles, namely Guadeloupe and Martinique. We detected significant differences in microbial community structure and composition between landing , the surrounding seawater, and from inland storage sites. In total we identified 22,214 prokaryotic and 17,679 eukaryotic OTUs. Among them, functional prediction analyses revealed a number of prokaryotes that might contribute to organic matter decomposition, nitrogen cycling and gas production, including sulfate-reducing bacteria at coastal landing sites, and methanogenic archaea at inland storage sites. We also found that Metazoan was the most abundant group in samples, with nematode clades that presented exclusive or specific richness and abundance patterns depending on their substrate. Together, these molecular inventories of the micro- and meiofauna communities provide baseline information for further characterization of trophic interactions, algal organic matter decomposition and nutrient transfers at coastal and inland storage sites.

Seasonal Variations in the Biodiversity, Ecological Strategy, and Specialization of Diatoms and Copepods in a Coastal System With Phaeocystis Blooms: The Key Role of Trait Trade-Offs - Breton, Elsa; Christaki, Urania; Benoit Sautour; Demonio, Oscar; Skouroliakou, Dimitra-Ioli; Grégory Beaugrand; Seuront, Laurent; Kléparski, Loïck; Poquet, Adrien; Nowaczyk, Antoine; Muriel Crouvoisier; Ferreira, Sophie; et al. (Frontiers in Marine Science, 2021)
Although eutrophication induced by anthropogenic nutrient enrichment is a driver of shifts in community composition and eventually a threat to marine biodiversity, the causes and consequences on ecosystem functioning remain greatly unknown. In this study, by applying a trait-based approach and measuring niche breadth of diatoms and copepods, the drivers and underlying mechanisms of the seasonal species succession of these ecological communities in a coastal system dominated in spring by Phaeocystis blooms were explored. It is suggested that the seasonal succession of diatoms and copepods is the result of several trade-offs among functional traits that are controlled by the seasonal abiotic and biotic pressure encountered by the plankton communities. The results of this study highlight that a trade-off between competition and predator, i.e., weak competitors are better protected against predation, plays an important role in promoting plankton species richness and triggers the Phaeocystis bloom. As often observed in eutrophicated ecosystems, only the biotic homogenization of the copepod community and the shift in the diet of copepods toward Phaeocystis detrital materials have been detected during the Phaeocystis bloom. The diatom and copepod communities respond synchronously to fluctuating resources and biotic conditions by successively selecting species with specific traits. This study confirms the key role of competition and predation in controlling annual plankton succession.

Short communication: Amphidromous goby postlarvae (penja) migration seasons and fisheries in West Sulawesi, Indonesia - Nurjirana, Nurjirana; Burhanuddin, Andi I; Philippe Keith; Haris, Abdul; Afrisal, Muhammad (Biodiversitas Journal of Biological Diversity, 2021)

Singular physiological behavior of the scleractinian coral Porites astreoides in the dark phase - Pascal Claquin; René-Trouillefou, Malika; Pascal Jean Lopez; Japaud, Aurélien; Yolande Bouchon-Navaro; Sébastien Cordonnier; Claude Bouchon (Coral Reefs, 2021)
Unlike most other corals that have been declining since the 1980s, the population of Porites astreoides, one of the dominant species of coral in Caribbean reefs, appears to be resilient. We investigated the physiological regulation of the electron transport chain of Symbiodiniaceae chloroplasts during the light / dark transition in P. astreoides compared to nine other common scleractinian corals. Protocols were applied to coral samples in seawater tanks and in situ. The maximum quantum yield (Fv/Fm) in the dark and the effective photochemical efficiency (Fq’/Fm’) in the light were measured during light-dark transitions, and alternative electron flow (AEF) mechanisms were evaluated using fluorescence variation in response to serial irradiation pulses (SIP-protocol). The variation in Fv/Fm (ΔYIImax) was calculated after 3 min or 2 h of dark acclimation (ΔYIImax(2h); ΔYIImax(3min)). The three species that belong to the genus Porites (P. astreoides, P. divaricata, P. furcata) showed plastoquinone reduction (PQ) in response to the SIP protocol, unlike all the other species tested. A marked decrease in Fv/Fm (ΔYIImax(2h) = 47.79%) was observed in P. astreoides in the dark whereas the average ΔYIImax(2h) of the other species tested was 0.677%. The decrease in ΔYIImax in P. astreoides was due to a significant increase in Fo (ΔFo(2h) = -108.64% ± SD 21.48) whereas Fm remained relatively stable. The increase in Fo was attributed to reduction of the PQ pool through a chlororespiration-like mechanism known to reduce the production of reactive oxygen species (ROS). This mechanism was triggered immediately after exposure to the dark, while a brief and moderate light exposure reversed it. Given the ecological success of P. astreoides, we suggest that the high antioxidant capability of this species in the dark phase could be one of the factors favoring its survival in the face of various environmental and anthropogenic threats.
Keywords: Caribbean reef corals; chlororespiration-like; PAM; resilience

Small- and large-scale processes including anthropogenic pressures as drivers of gastropod communities in the NE Atlantic coast: A citizen science based approach - Serranito, Bruno; Diméglio, Tristan; Frédéric Ysnel; Lizé, Anne; Eric Feunteun (Science of The Total Environment, 2021)

Small rodent communities (Muridae) in Gabonese savannas: species diversity and biogeographical affinitiesAbstract - Mboumba, Jean-François; Hervé, Maxime R.; Guyot, Véronique; Frédéric Ysnel (Mammalia, 2021)

Sources, quality and transfers of organic matter in a highly-stratified sub-Arctic coastal system (Saint-Pierre-et-Miquelon, NW Atlantic) - Bridier, Guillaume; Tarik Meziane; Grall, Jacques; Chauvaud, Laurent; Donnet, Sébastien; Lazure, Pascal; Frédéric Olivier (Progress in Oceanography, 2021)
In response to ongoing global climate change, marine ecosystems in the northwest Atlantic are experiencing one of the most drastic increases in sea surface temperatures in the world. This warming can increase water column stratification and decrease surface nutrient concentrations, in turn impacting primary productivity and phytoplankton assemblages. However, the exact impacts of these changes on sources and quality of organic matter as well as its transfers to the benthic compartment remain uncertain. This survey characterized organic matter sources and quality within a highly-stratified sub-Arctic coastal system (Saint-Pierre and Miquelon) and described its transfer towards a biomass-dominant primary consumer, the sand dollar Echinarachnius parma. This study analyzed fatty acid and stable isotope (δ13C and δ15N) composition of surface and bottom Particulate Organic Matter (s-POM and b-POM, respectively), Sedimentary Organic Matter (SOM) and sand dollar tissue along a near shore to offshore gradient during two contrasting seasons associated either with sharp or weak water column stratification (i.e. High vs Low Stratification Periods). Results revealed high relative abundances of polyunsaturated fatty acids (notably macro- and microalgae markers) in POM during the Low Stratification Period while the High Stratification Period was characterized by elevated relative abundance of saturated fatty acids indicating a higher organic matter degradation state. In addition, strong seasonal differences were also observed in food availability with four-fold higher concentrations in total suspended solids during Low vs High Stratification Periods. These results suggested thus multiple negative effects of stratification on pelagic-benthic coupling and POM quality. Lower nutrient repletion of surface waters during period of sharp stratification diminishes pelagic-benthic coupling by reducing food availability, POM quality and vertical transfer of organic matter. By contrast, the sediment-based diet of E. parma showed a low spatiotemporal variability reflecting the homogenous composition of the SOM. This study suggests that intensified water column stratification due to increasing sea surface temperatures may modify the pelagic-benthic coupling and future quality and composition of POM pools.

Special features of neuroendocrine interactions between stress and reproduction in teleosts - Rousseau, Karine; Prunet, Patrick; Sylvie Dufour (General and Comparative Endocrinology, 2021)

Temporal Patterns and Intra- and Inter-Cellular Variability in Carbon and Nitrogen Assimilation by the Unicellular Cyanobacterium Cyanothece sp. ATCC 51142Data_Sheet_1.pdfData_Sheet_2.XLSX - Polerecky, Lubos; Masuda, Takako; Eichner, Meri; Rabouille, Sophie; Vancová, Marie; Kienhuis, Michiel V. M.; Bernát, Gabor; Bonomi-Barufi, Jose; Campbell, Douglas Andrew; Pascal Claquin; Červený, Jan; Giordano, Mario; et al. (Frontiers in Microbiology, 2021)

Temporary turbine and reservoir level management to improve downstream migration of juvenile salmon through a hydropower complex - Tétard, Stéphane; Roy, Romain; Teichert, Nils; Rancon, Jocelyn; Courret, Dominique (Knowledge & Management of Aquatic Ecosystems, 2021)
Developing management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passage through the Poutès dam (Allier River, France). 124 smolts were tracked through the reservoir and downstream of the dam, during implementation of turbine modulation and/or shutdown during night and reservoir level lowering. Level lowering significantly reduced median residence time from 3.4 days to 4.4 hours. However, even with high spill during turbine modulation, the risk of smolt being drawn toward the turbines was increased at low reservoir level due to the site’s configuration, greater proximity to the surface and weak repulsive effect of the rack. Moreover, results revealed that a substantial proportion of smolts can migrate during daytime and twilight during floods, even at the beginning of the migration period. Thus targeted turbine shutdown has a good potential to protect smolts, but implementation requires studies taking account of site specificities and a flexible approach.
Keywords: Atlantic salmon; downstream migration; migratory delay; operational management; Turbine shutdown

Thermodynamic uptake of atmospheric CO2 in the oligotrophic and semiarid São Francisco estuary (NE Brazil) - Gwenaël Abril; Libardoni, Bruno G.; Brandini, Nilva; Cotovicz, Luiz C.; Medeiros, Paulo R.P.; Cavalcante, Geórgenes H.; Knoppers, Bastiaan A. (Marine Chemistry, 2021)

Towards a better understanding of the effects of self-shading on Fucus serratus populations - Cédric Hubas (Peer Community In Ecology, 2021)

Transcriptome Profiling of the Pacific Oyster Crassostrea gigas Visceral Ganglia over a Reproduction Cycle Identifies Novel Regulatory Peptides - Réalis-Doyelle, Emilie; Schwartz, Julie; Cabau, Cédric; Le Franc, Lorane; Bernay, Benoît; Guillaume Rivière; Klopp, Christophe; Favrel, Pascal (Marine Drugs, 2021)

Transcriptome Profiling of the Pacific Oyster Visceral Ganglia over a Reproduction Cycle Identifies Novel Regulatory Peptides. - Réalis-Doyelle, Emilie; Schwartz, Julie; Cabau, Cédric; Le Franc, Lorane; Bernay, Benoît; Riviere, Guillaume; Klopp, Christophe; Favrel, Pascal (Mar Drugs, 2021)
The neuropeptides involved in the regulation of reproduction in the Pacific oyster () are quite diverse. To investigate this diversity, a transcriptomic survey of the visceral ganglia (VG) was carried out over an annual reproductive cycle. RNA-seq data from 26 samples corresponding to VG at different stages of reproduction were de novo assembled to generate a specific reference transcriptome of the oyster nervous system and used to identify differentially expressed transcripts. Transcriptome mining led to the identification of novel neuropeptide precursors (NPPs) related to the bilaterian Eclosion Hormone (EH), crustacean female sex hormone/Interleukin 17, Nesfatin, neuroparsin/IGFBP, prokineticins, and urotensin I; to the protostome GNQQN, pleurin, prohormones 3 and 4, prothoracotropic hormones (PTTH), and QSamide/PXXXamide; to the lophotrochozoan CCWamide, CLCCY, HFAamide, and LXRX; and to the mollusk-specific NPPs CCCGS, clionin, FYFY, GNamide, GRWRN, GSWN, GWE, IWMPxxGYxx, LXRYamide, RTLFamide, SLRFamide, and WGAGamide. Among the complete repertoire of NPPs, no sex-biased expression was observed. However, 25 NPPs displayed reproduction stage-specific expression, supporting their involvement in the control of gametogenesis or associated metabolisms.

Trophic niche of the invasive gregarious species Crepidula fornicata, in relation to ontogenic changes - Androuin, Thibault; Stanislas Dubois; Cédric Hubas; Lefebvre, Gwendoline; Le Grand, Fabienne; Gauthier Schaal; Carlier, Antoine (bioRxiv, 2021)
Crepidula fornicata is a common and widespread invasive gregarious species along the European coast. Among its life-history traits, well documented ontogenic changes in behavior (i.e., motile male to sessile female) suggest a potential shift in feeding strategy across its life stages. Considering the ecological significance of this species in colonized areas, understanding how conspecifics share the trophic resource is crucial. Using fatty acids (FA) and stable isotopes (SI) as complementary trophic markers, we conducted a field survey between late winter and spring to investigate the trophic niche of three ontogenic stages of C. fornicata that bear different sexual (male/female) and motility (motile/sessile) traits. Potential trophic sources were characterized by their pigment, FA and SI compositions and showed well discriminated compositions over the studied period. We showed that the biofilm covering C. fornicata shells harbored a higher biomass of primary producers (i.e., chlorophytes and diatoms) than the surrounding sediment. Over the studied period, we observed a covariation between the three ontogenic stages for both FA and SI compositions which suggest that the trophic niche of C. fornicata does not change significantly across its benthic life. During periods of low food availability, slipper limpets displayed an opportunistic suspension-feeding behaviour, relying on both fresh and detrital organic matter, likely coming from superficial sedimentary organic matter. However, during high food availability (i.e., spring phytoplankton bloom), all ontogenic stages largely benefited from this fresh supply of organic matter (pelagic diatoms in this case). The three ontogenic stages showed consistent differences in FA composition, and to a lesser extent in SI composition. These differences persist over time, as they originate from ontogenic physiological changes (differential growth rates, metabolic rate or gametogenesis) rather than diet discrepancies. This study revealed that multiple trophic markers allow high complementary to characterize organic matter as well as food partitioning between conspecific organisms. Recommended by PCI Ecology : https://ecology.peercommunityin.org/articles/rec?id=140

Unraveling salinity extreme events in coastal environments: a winter focus on the Bay of Brest - Poppeschi, Coline; Charria, Guillaume; Goberville, Eric; Rimmelin-Maury, Peggy; Barrier, Nicolas; Petton, Sébastien; Unterberger, Maximilian; Emilie Grossteffan; Répécaud, Michel; Quéméner, Loic; Theetten, Sébastien; Le roux, Jean-François; et al. (Frontiers in Marine Science, 2021)
Extreme weather events affect coastal marine ecosystems. The increase in intensity and occurrence of such events drive modifications in coastal hydrology and hydrodynamics. Here, focusing on the winter period (from December to March), we investigated long-term (2000-2018) changes in the hydrological properties of the Bay of Brest (French Atlantic coast) as an example of the response of a semi-enclosed bay to extreme weather episodes and large-scale atmospheric circulation patterns. The relationships between extreme weather events and severe low salinity conditions (as a proxy for changes in water density) were investigated using high-frequency in situ observations and high-resolution numerical simulations. The identification of intense episodes was based on the timing, duration and annual occurrence of extreme events. By examining the interannual variability of extreme low salinity events, we detect a patent influence of local and regional weather conditions on atmospheric and oceanic circulation patterns, precipitation and river runoff. We revealed that low salinity events in Brittany were controlled by large-scale forcings: they prevailed during the positive phase of the North Atlantic Oscillation and periods of low occurrences of the Atlantic Ridge weather regime. The increase in severe storms observed in western France since 2010 has led to a doubling of the occurrence and duration of extreme low salinity events in Brittany.

Upstream/downstream food quality differences in a Caribbean Island River - Frotté, Lou; Alexandre Bec; Cédric Hubas; Perrière, Fanny; Cordonnier, Sébastien; Bezault, Etienne; Monti, Dominique (Aquatic Ecology, 2021)

Water temperature influences larval survival of the amphidromous goby Sicyopterus lagocephalus - Teichert, Nils; Lagarde, Raphaël; Occelli, Nicolas; Ponton, Dominique; Gaudin, Philippe (Ecology of Freshwater Fish, 2021)
Water warming induced by human activities can impact fish larvae survival, notably because it influences larval development and prey abundances. Amphidromous gobies of the subfamily Sicydiinae are particularly sensitive to this threat as the newly hatched free embryos are poorly developed and the first feeding opportunity only occurs after they reach the ocean. Here, we studied how water temperature (21, 23, 25, 29 and 31°C) impacts early development stages of Sicyopterus lagocephalus in both freshwater and marine aquaria (salinity 35). We monitored survival time, larval condition and the occurrence of critical developmental events such as mouth opening, yolk sac and oil globule resorption. In freshwater, the survival exceeded 150 hours at 21°C, while it dropped below 50 hours at 31°C. In seawater, the larval development of unfed larvae was significantly affected by temperature, survival time being greatly reduced in warmer waters. Accounting for the observed duration between mouth opening and the resorption of the oil globule, we estimated that larvae need to find suitable prey in seawater within a short time: around 30 hours during the peak of reproduction in summer. Otherwise, their endogenous reserves become depleted and their condition degrades. This study emphasises the sensitivity of free embryos to stream flow alterations, which contributes to the increase in water temperature and to the slowing down of larvae drift to the ocean. We conclude that once in seawater the temperature and feeding conditions experienced by amphidromous larvae are critical for survival.
Keywords: amphidromy; Early life history; larval survival; mixed feeding period; starvation; water warming

Waterfalls mediate the longitudinal distribution of diadromous predatory fishes structuring communities in tropical, short, steep coastal streams - Ebner, Brendan C.; Donaldson, James A.; Murphy, Helen; Thuesen, Paul; Ford, Andrew; Schaffer, Jason; Philippe Keith (Freshwater Biology, 2021)

Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides ) fishery in the South Atlantic: a comparison of estimation methods - Earl, Timothy; MacLeod, Eleanor; Söffker, Marta; Gasco, N; Massiot-Granier, Félix; Tixier, Paul; Darby, Christopher (ICES Journal of Marine Science, 2021)

Whale depredation in the South Georgia Patagonian toothfish (Dissostichus eleginoides ) fishery in the South Atlantic: a comparison of estimation methods - Earl, Timothy; MacLeod, Eleanor; Söffker, Marta; Nicolas Gasco; Massiot-Granier, Félix; Tixier, Paul; Darby, Christopher (ICES Journal of Marine Science, 2021)

Advances in the use of Paris-Edinburgh presses for high pressure neutron scattering - Klotz, S; Hansen, Th; Lelièvre-Berna, E; Amand, Louis; Maurice, J; Payre, C (Journal of Neutron Research, 2020)

Anthropogenic boat noise reduces feeding success in winter flounder larvae (Pseudopleuronectes americanus) - Gendron, Gilberte; Tremblay, Rejean; Jolivet, Aurélie; Frédéric Olivier; Chauvaud, Laurent; Winkler, Gesche; Audet, Céline (Environmental Biology of Fishes, 2020)
The aim of this study was to explore an emerging discipline addressing the impact of anthropogenic noise on larval stages of marine organisms. We assessed the influence of boat noise on the feeding behaviour of the pelagic larvae of winter flounder (Pseudopleuronectes americanus, Walbaum, 1792). The hypothesis was that boat noise influences the feeding behaviour of P. americanus flounder larvae independently of prey  density. Aquaria containing P. americanus larvae were placed in water baths in which boat noise was diffused for the “noise” treatment and compared to control aquaria with no sound emissions. Larvae were filmed  using cameras placed above the aquaria and their behaviour was recorded. Larvae exposed to anthropogenic noise displayed significantly fewer hunting events than controls, and their stomach volumes were  significantly smaller. This noise effect was the same at all prey densities used, suggesting that larval feeding behaviour is negatively impaired by anthropogenic noise.
Keywords: Feeding behaviour

Assessing the impact of toothed whale depredation on socio-ecosystems and fishery management in wide-ranging subantarctic fisheries - Tixier, Paul; Burch, Paul; Massiot-Granier, Félix; Ziegler, Philippe; Welsford, Dirk; Lea, Mary-Anne; Hindell, Mark A; Guinet, Christophe; Wotherspoon, Simon; Nicolas Gasco; Clara Péron; Guy Duhamel; et al. (Reviews in Fish Biology and Fisheries, 2020)
Marine predators feeding on fisheries catches directly on the fishing gear, a behaviour termed “depredation”, has emerged as a major human-wildlife conflict globally, often resulting in substantial socio-economic and ecological impacts. This study investigated the extent of this conflict in commercial Patagonian toothfish (Dissostichus eleginoides) fisheries across subantarctic waters where both killer whales (Orcinus orca) and sperm whales (Physeter macrocephalus) feed on toothfish caught on longline hooks. Using long-term datasets from six major fishing areas, from southern Chile to the Indian Ocean sector of the Southern Ocean, statistical models were developed to quantify the catch removals due to whale depredation interactions. The results indicated that these removals were large, totalling more than 6600 t of toothfish between 2009 and 2016 with an annual mean of 837 t [95% CI 480–1195 t], comprised of 317 t [232–403 t] and 518 t [247–790 t] removed by killer whales and sperm whales, respectively. Catch removals greatly varied between areas, with the largest estimates found at Crozet, where on average 279 t [179–379 t] of toothfish per year, equivalent to 30% [21–37%] of the total catches. Together, these findings provide metrics to assess the impacts of depredation interactions on the fishing industry, whale populations, fish stocks and associated ecosystems. With an estimated $15 M USD worth of fish depredated every year, this study highlights the large geographic scale and economic significance of the depredation issue and its potential to compromise the viability of some toothfish fisheries which are the primary socio-economic activity in subantarctic regions.

Assessment of the quality of European silver eels and tentative approach to trace the origin of contaminants – A European overview - Bourillon, Bastien; Anthony Acou; Thomas Trancart; Belpaire, Claude; Covaci, Adrian; Bustamante, Paco; Faliex, Elisabeth; Amilhat, Elsa; Malarvannan, Govindan; Virag, Laure; Aarestrup, Kim; Bervoets, Lieven; et al. (Science of The Total Environment, 2020)

Basal teleosts provide new insights into the evolutionary history of teleost-duplicated aromatase - Lin, Chien-Ju; Maugars, Gersende; Lafont, Anne-Gaelle; Jeng, Shan-Ru; Wu, Guan-Chung; Sylvie Dufour; Chang, Ching-Fong (General and Comparative Endocrinology, 2020)

Behavioural inference from signal processing using animal-borne multi-sensor loggers: a novel solution to extend the knowledge of sea turtle ecology - Jeantet, Lorène; Planas-Bielsa, Víctor; Benhamou, Simon; Geiger, Sébastien; Martin, Jordan; Siegwalt, Flora; Lelong, Pierre; Gresser, Julie; Etienne, Denis; Hielard, Gaëlle; Arqué, Alexandre; Régis, Sidney; et al. (Royal Society Open Science, 2020)

Benefits for the Management and Preservation of Fluid Collections Using QR Codes - Pruvost, P. (Collection Forum, 2020)

Benthic ecoregionalization based on echinoid fauna of the Southern Ocean supports current proposals of Antarctic Marine Protected Areas under IPCC scenarios of climate change - Fabri-Ruiz, Salomé; Danis, Bruno; Navarro, Nicolas; Koubbi, Philippe; Laffont, Rémi; Saucède, Thomas (Global Change Biology, 2020)

Biodiversity inventory of the grey mullets (Actinopterygii: Mugilidae) of the Indo‐Australian Archipelago through the iterative use of DNA‐based species delimitation and specimen assignment methods - Delrieu‐Trottin, Erwan; Durand, Jean‐Dominique; Limmon, Gino; Sukmono, Tedjo; Kadarusman; Sugeha, Hagi Yulia; Chen, Wei‐Jen; Busson, Frederic; Borsa, Philippe; Dahruddin, Hadi; Sauri, Sopian; Fitriana, Yuli; et al. (Evolutionary Applications, 2020)
DNA barcoding opens new perspectives on the way we document biodiversity. Initially proposed to circumvent the limits of morphological characters to assign unknown individuals to known species, DNA barcoding has been used in a wide array of studies where collecting species identity constitutes a crucial step. The assignment of unknowns to knowns assumes that species are already well identified and delineated, making the assignment performed reliable. Here, we used DNA‐based species delimitation and specimen assignment methods iteratively to tackle the inventory of the Indo‐Australian Archipelago grey mullets, a notorious case of taxonomic complexity that requires DNA‐based identification methods considering that traditional morphological identifications are usually not repeatable and sequence mislabeling is common in international sequence repositories. We first revisited a DNA barcode reference library available at the global scale for Mugilidae through different DNA‐based species delimitation methods to produce a robust consensus scheme of species delineation. We then used this curated library to assign unknown specimens collected throughout the Indo‐Australian Archipelago to known species. A second iteration of OTU delimitation and specimen assignment was then performed. We show the benefits of using species delimitation and specimen assignment methods iteratively to improve the accuracy of specimen identification and propose a workflow to do so.
Keywords: Coral Triangle; Cryptic diversity; DNA barcoding; reference library; taxonomic gap

Can the Threat of Economic Sanctions Ensure the Sustainability of International Fisheries? An Experiment of a Dynamic Non-cooperative CPR Game with Uncertain Tipping Point - Jules, Selles; Sylvain, Bonhommeau; Patrice, Guillotreau; Thomas, Vallée (Environmental and Resource Economics, 2020)

Is a cannibal different from its conspecifics? A behavioural, morphological, muscular and retinal structure study with pikeperch juveniles under farming conditions - Tatiana Colchen; Gisbert, E; Ledoré, Y; Teletchea, F; Fontaine, P; Pasquet, A (Applied Animal Behaviour Science, 2020)
Most studies carried out on personality recognized that personality is defined by behavioural traits consistent through time and/or contexts. In fish, most studies on personality were performed either on juveniles (aged between 6 months and 1 year) or adults, but very few focused on the early life stages. The main goal of this study is to characterize behavioural syndromes and to highlight the existence of a personality in young juvenile pikeperch, a species with a strong economic value. To study the consistency of behavioural responses of juvenile (50 and 64 days post-hatch) pikeperch Sander lucioperca (n = 41, total length = 5.8 ± 1.0 cm and mass = 1.6 ± 0.7 g), we performed three tests per fish in one day: exploration (cross-maze), dyadic and restraint test. In the cross-maze test, exploratory fish were more active and bolder. In the dyadic test, fish with the highest number of contacts, showed also more approaches, orientations and avoidance behaviours. In the restraint test, bolder fish were more active and tried to escape more often. Consequently, the investigation of the different behavioural responses of each fish highlighted behavioural syndromes in this species. Furthermore, for the first time, we showed, with a cross-context analysis, that young juvenile pikeperch, responded in the same way to exploration and dyadic test but their responses were opposite in the restraint test. Our results opened new opportunities for testing individual personality in very young fish that may help solving some aquaculture problems, such as intra-cohort cannibalism.
Keywords: Behavioural syndromes; behavioural tests; Individual personality; Pikeperch juveniles; Sander lucioperca

Carbon dioxide sources and sinks in the delta of the Paraíba do Sul River (Southeastern Brazil) modulated by carbonate thermodynamics, gas exchange and ecosystem metabolism during estuarine mixing - Cotovicz, Luiz C.; Vidal, Luciana O.; de Rezende, Carlos Eduardo; Bernardes, Marcelo C.; Knoppers, Bastiaan A.; Sobrinho, Rodrigo L.; Cardoso, Renan P.; Muniz, Marcelo; dos Anjos, Roberto Meigikos; Biehler, Antoine; Gwenaël Abril (Marine Chemistry, 2020)

Comparison of approaches for incorporating depredation on fisheries catches into Ecopath - Clavareau, Lyndsay; Marzloff, Martin P; Trenkel, Verena M; Bulman, Catherine M; Gourguet, Sophie; Le Gallic, Bertrand; Hernvann, Pierre-Yves; Clara Péron; Nicolas Gasco; Faure, Johanna; Tixier, Paul (ICES Journal of Marine Science, 2020)

Comparison of embryonic and adult shells of Sepia officinalis (Cephalopoda, Mollusca) - Dauphin, Yannicke; Luquet, Gilles; Percot, Aline; Laure Bonnaud-Ponticelli (Zoomorphology, 2020)

The complete mitochondrial genome of Thymallus thymallus (Linnaeus, 1758) (Actinopterygii, Salmonidae) obtained by long range PCRs and double multiplexing - Denys, Gaël; Secci-Petretto, Giulia; Gomes-Dos-Santos, André (Cybium, 2020)
Le génome mitochondrial complet de Thymallus thymallus (Actinopterygii, Salmonidae) provenant d’un voucher enregistré en collection et capturé dans l’Ain (bassin du Rhône) a été séquencé. La séquence d’une longueur de 16 660 pb, contient 13 gènes codants, 22 ARN de transfert dont 2 ARNt-Leu et 2 ARNt-Ser, 2 gènes ARN ribosomiques et la région de contrôle. Un espace intergénique et des séquences se chevauchant ont été trouvés. La composition des bases du mitogénome est de 27,5% A, 27,9% T, 27,1% C et 17,5% G. Ce mitogénome a été séquencé pour moins de 20 euros.

A current synthesis on the effects of electric and magnetic fields emitted by submarine power cables on invertebrates - Luana Albert; François Deschamps; Aurélie Jolivet; Frédéric Olivier; Laurent Chauvaud; Sylvain Chauvaud (Marine Environmental Research, 2020)
The goal of clean renewable energy production has promoted the large-scale deployment of marine renewable energy devices, and their associated submarine cable network. Power cables produce both electric and magnetic fields that raise environmental concerns as many marine organisms have magneto and electroreception abilities used for vital purposes. Magnetic and electric fields‚Äô intensities decrease with distance away from the cable. Accordingly, the benthic and the sedimentary compartments are exposed to the highest field values. Although marine invertebrate species are the major fauna of these potentially exposed areas, they have so far received little attention. We provide extensive background knowledge on natural and anthropogenic marine sources of magnetic and electric fields. We then compile evidence for magneto- and electro-sensitivity in marine invertebrates and further highlight what is currently known about their interactions with artificial sources of magnetic and electric fields. Finally we discuss the main gaps and future challenges that require further investigation.

The dance of the Cape gannet may contain social information on foraging behaviour - Courbin, Nicolas; Chinho, Tendai; Pichegru, Lorien; Verma-Grémillet, Ambalika; Clara Péron; Ryan, Peter G; Grémillet, David (Animal Behaviour, 2020)
Social information percolates through a variety of channels to influence animal decision making, with a notable effect on reproductive and feeding success. Colonial central place foragers can reduce time to locate ephemeral food patches and/or increase foraging rate by following their informed peers, parasitizing direction of returning successful foragers, or being intentionally informed on distant food locations at the colony (e.g. the waggle dance of the honey bee). Ceremonial behaviours may also deliver social foraging information between mates, which can spread inadvertently to neighbours. Here we tested for information display in Cape gannets, Morus capensis, a socially monogamous species, during the elaborate dance ceremony performed each time a partner returns to the nest during the breeding season. We tracked fine-scale foraging behaviour of gannets using bird-borne GPS recorders, and videorecorded their subsequent dance ceremony, which involved up to 14 different displays. As we hypothesized, dance characteristics were associated with foraging trip features. Notably, overall dance duration was negatively linked to foraging trip duration, which was highly positively correlated with foraging range, foraging path length and time spent foraging during the trip. Overall dance duration was also negatively linked with distance to the main foraging grounds. Additionally, the duration of preening behaviour was related to the bearing of the main feeding spot. The latter relationship was supported by a Bayesian model averaging analysis, allowing inferences robust to multiple comparisons. Overall, ceremonial behaviour may provide social foraging information on feeding locations, while evidence for further information transfer to the mate or neighbours was not tested here. Frequent updating on prey spatial distribution, inadvertently communicated or not, should be particularly valuable for predators tracking ephemeral prey patches, providing an additional advantage to colonial living. Our results may have strong implications for cultural evolution in animal societies.

A database of freshwater fish species of the Amazon Basin - Jézéquel, Céline; Tedesco, Pablo A; Bigorne, Remy; Maldonado-Ocampo, Javier A; Ortega, Hernan; Hidalgo, Max; Martens, Koen; Torrente-Vilara, Gislene; Zuanon, Jansen; Acosta, Astrid; others (Scientific data, 2020)

Deciphering mollusc shell production: the roles of genetic mechanisms through to ecology, aquaculture and biomimetics. - Clark, Melody S; Peck, Lloyd S; Arivalagan, Jaison; Backeljau, Thierry; Berland, Sophie; Cardoso, Joao C R; Caurcel, Carlos; Chapelle, Gauthier; De Noia, Michele; Dupont, Sam; Gharbi, Karim; Hoffman, Joseph I; et al. (Biol Rev Camb Philos Soc, 2020)
Most molluscs possess shells, constructed from a vast array of microstructures and architectures. The fully formed shell is composed of calcite or aragonite. These CaCO crystals form complex biocomposites with proteins, which although typically less than 5% of total shell mass, play significant roles in determining shell microstructure. Despite much research effort, large knowledge gaps remain in how molluscs construct and maintain their shells, and how they produce such a great diversity of forms. Here we synthesize results on how shell shape, microstructure, composition and organic content vary among, and within, species in response to numerous biotic and abiotic factors. At the local level, temperature, food supply and predation cues significantly affect shell morphology, whilst salinity has a much stronger influence across latitudes. Moreover, we emphasize how advances in genomic technologies [e.g. restriction site-associated DNA sequencing (RAD-Seq) and epigenetics] allow detailed examinations of whether morphological changes result from phenotypic plasticity or genetic adaptation, or a combination of these. RAD-Seq has already identified single nucleotide polymorphisms associated with temperature and aquaculture practices, whilst epigenetic processes have been shown significantly to modify shell construction to local conditions in, for example, Antarctica and New Zealand. We also synthesize results on the costs of shell construction and explore how these affect energetic trade-offs in animal metabolism. The cellular costs are still debated, with CaCO precipitation estimates ranging from 1-2 J/mg to 17-55 J/mg depending on experimental and environmental conditions. However, organic components are more expensive (~29 J/mg) and recent data indicate transmembrane calcium ion transporters can involve considerable costs. This review emphasizes the role that molecular analyses have played in demonstrating multiple evolutionary origins of biomineralization genes. Although these are characterized by lineage-specific proteins and unique combinations of co-opted genes, a small set of protein domains have been identified as a conserved biomineralization tool box. We further highlight the use of sequence data sets in providing candidate genes for in situ localization and protein function studies. The former has elucidated gene expression modularity in mantle tissue, improving understanding of the diversity of shell morphology synthesis. RNA interference (RNAi) and clustered regularly interspersed short palindromic repeats - CRISPR-associated protein 9 (CRISPR-Cas9) experiments have provided proof of concept for use in the functional investigation of mollusc gene sequences, showing for example that Pif (aragonite-binding) protein plays a significant role in structured nacre crystal growth and that the Lsdia1 gene sets shell chirality in Lymnaea stagnalis. Much research has focused on the impacts of ocean acidification on molluscs. Initial studies were predominantly pessimistic for future molluscan biodiversity. However, more sophisticated experiments incorporating selective breeding and multiple generations are identifying subtle effects and that variability within mollusc genomes has potential for adaption to future conditions. Furthermore, we highlight recent historical studies based on museum collections that demonstrate a greater resilience of molluscs to climate change compared with experimental data. The future of mollusc research lies not solely with ecological investigations into biodiversity, and this review synthesizes knowledge across disciplines to understand biomineralization. It spans research ranging from evolution and development, through predictions of biodiversity prospects and future-proofing of aquaculture to identifying new biomimetic opportunities and societal benefits from recycling shell products.

Deciphering shell proteome within different Baltic populations of mytilid mussels illustrates important local variability and potential consequences in the context of changing marine conditions - Arivalagan, Jaison; Marie, Benjamin; Chiappetta, Giovanni; Vinh, Joëlle; Gallet, Xavier; Lebon, Matthieu; M'Zoudi, Saloua; Dubois, Philippe; Berland, Sophie; Marie, Arul (Science of The Total Environment, 2020)

Denitrification and associated nitrous oxide and carbon dioxide emissions from the Amazonian wetlands - Guilhen, Jérémy; Al Bitar, Ahmad; Sauvage, Sabine; Parrens, Marie; Martinez, Jean-Michel; Gwenaël Abril; Moreira-Turcq, Patricia; Sánchez-Pérez, José-Miguel (Biogeosciences, 2020)

Development of an accurate model to predict the phenology of Atlantic salmon smolt spring migration - Teichert, Nils; Benitez, Jean‐Philippe; Dierckx, Arnaud; Tétard, Stéphane; Oliveira, Eric; Thomas Trancart; Eric Feunteun; Ovidio, Michaël (Aquatic Conservation: Marine and Freshwater Ecosystems, 2020)
Changes in migration timing, resulting from the alteration in river continuity or the effect of climate change, can have major consequences on the population dynamics of diadromous fish. Forecasting the phenology of fish migration is thus critically important to implement management actions aimed at protecting fish during their migration. In this study, an 11‐year monitoring survey of Atlantic salmon smolts (Salmo salar ) from the Ourthe River, Belgium, was analysed within a European Special Area of Conservation to improve the understanding of environment‐induced spring migration. A logistic model was fitted to forecast smolt migration and to calculate phenological indicators for management, i.e. the onset, end, and duration of migration, while accounting for the influence of photoperiod, water temperature, and hydrological conditions. The results indicated that the photo‐thermal units accumulated by smolts above a 7°C temperature threshold was a relevant proxy to reflect the synergistic effect between temperature and photoperiod on smolt migration. After integrating the effect of river flow pulses, the model accurately explained the inter‐annual changes in migration timing (R2 = 0.95). The model predictions provide decisive management information to identify sensitive periods during which mitigation measures (e.g. hydropower turbine shutdown, river discharge management) should be conducted to promote smolt survival. The model was used to predict phenological characteristics under future scenarios of climate change. The results suggest a joint effect of hydrological alterations and water warming. Temperature increases of 1–4°C were associated with earlier initiation of migration, 6–51 days earlier, and spring flood events greatly influenced the duration of the migration period. Accordingly, the combined effects of human‐induced modifications of the hydrological regimes and increasing temperatures could result in a mismatch between the smolt and favourable survival conditions in the marine environment.

Dietary taurine improves vision in different age gilthead sea bream (Sparus aurata) larvae potentially contributing to increased prey hunting success and growth - Gaon, A.; Nixon, O.; Tandler, A.; Falcon, J.; Besseau, L.; Escande, M.; El Sadin, S.; Allon, G.; Koven, W. (Aquaculture, 2020)

Differential Regulation of the Expression of the Two Thyrotropin Beta Subunit Paralogs by Salmon Pituitary Cells In Vitro - Fleming, Mitchell Stewart; Maugars, Gersende; Martin, Patrick; Sylvie Dufour; Rousseau, Karine (Frontiers in Endocrinology, 2020)

Disentangling the taxonomy of the subfamily Rasborinae (Cypriniformes, Danionidae) in Sundaland using DNA barcodes - Sholihah, Arni; Delrieu-Trottin, Erwan; Sukmono, Tedjo; Dahruddin, Hadi; Risdawati, Renny; Elvyra, Roza; Wibowo, Arif; Kustiati, Kustiati; Busson, Frederic; Sauri, Sopian; Nurhaman, Ujang; Dounias, Edmond; et al. (Scientific Reports, 2020)
iodiversity hotspots have provided useful geographic proxies for conservation efforts. Delineated from a few groups of animals and plants, biodiversity hotspots do not reflect the conservation status of freshwater fishes. With hundreds of new species described on a yearly basis, fishes constitute the most poorly known group of vertebrates. This situation urges for an acceleration of the fish species inventory through fast and reliable molecular tools such as DNA barcoding. The present study focuses on the freshwater fishes diversity in the Sundaland biodiversity hotspot in Southeast Asia. Recent studies evidenced large taxonomic gaps as well as unexpectedly high levels of cryptic diversity, particularly so in the islands of Java and Bali. The Cypriniformes genera Rasbora and Nemacheilus account for most of the endemic species in Java and Bali, however their taxonomy is plagued by confusion about species identity and distribution. This study examines the taxonomic status of the Rasbora and Nemacheilus species in Java, Bali and Lombok islands through DNA barcodes, with the objective to resolve taxonomic confusion and identify trends in genetic diversity that can be further used for conservation matters. Several species delimitation methods based on DNA sequences were used and confirmed the status of most species, however several cases of taxonomic confusion and two new taxa are detected. Mitochondrial sequences argue that most species range distributions currently reported in the literature are inflated due to erroneous population assignments to the species level, and further highlight the sensitive conservation status of most Rasbora and Nemacheilus species on the islands of Java, Bali and Lombok.
Keywords: Conservation genetics; Cryptic diversity; Population fragmentation; Southeast Asia; taxonomy

Diversité des assemblages d’araignées dans les écosystèmes savanicoles des Plateaux Batéké, Haut-Ogooué, Gabon - Alban-Michel NGUÉMA NGUÉMA; Assane NDIAYE; Lynda Chancelia NKOGHE NKOGHE; Jacques François MAVOUNGOU1; Frédéric Ysnel (Afrique Science, 2020)

Diversity of Light Sensing Molecules and Their Expression During the Embryogenesis of the Cuttlefish (Sepia officinalis) - Bonadè, Morgane; Ogura, Atsushi; Corre, Erwan; Bassaglia, Yann; Laure Bonnaud-Ponticelli (Frontiers in Physiology, 2020)
Keywords: arrestin; cryptochrome; Development; Eye; opsin; Sepia officinalis

Does parasitism influence sediment stability? Evaluation of trait-mediated effects of the trematode Bucephalus minimus on the key role of cockles Cerastoderma edule in sediment erosion dynamics - Dairain, Annabelle; Maire, Olivier; Meynard, Guillaume; Francis Orvain (Science of The Total Environment, 2020)

Effect of Light Intensity and Light Quality on Diatom Behavioral and Physiological Photoprotection - Prins, Antoine; Deleris, Paul; Cédric Hubas; Bruno Jesus (Frontiers in Marine Science, 2020)
In this study, we investigated the different photoregulation responses of diatom dominated natural biofilms to different light intensities and wavelengths, over a tidal cycle in the laboratory. We compared the overall effect of light spectral quality from its light absorption (Qphar) dependent effect. Two different conditions were compared to study photoprotective strategies: sediment (migrational) and without sediment (non-migrational). Three different colors (blue, green, and red) and two light intensities (low light, LL at 210 μmol.photons.m–2.s–1 and high light, HL at 800 μmol.photons.m–2.s–1) showed strong interactions in inducing behavioral and physiological photoprotection. Non-migrational biofilm non-photochemical quenching (NPQ) was much more reactive to blue HL than red HL while it did not differ in LL. We observed a biphasic NPQ response with a light threshold between 200 and 250 μmol.photons.m–2.s–1 of Qphar that elicited the onset of physiological photoprotection. Similar HL differences were not observed in migrational biofilms due to active vertical migration movements that compensated light saturating effects. Our results showed that within migrational biofilms there was an interaction between light quality and light intensity on cell accumulation pattern at the sediment surface. This interaction led to inverse diatom accumulation patterns between blue and red light at the same intensity: LL (blue + 200.67%, red + 123.96%), HL (blue + 109.15%, red + 150.34%). These differences were largely related to the differential amount of light absorbed at different wavelengths and highlighted the importance of using wavelength standardized intensities. Different vertical migration patterns significantly affected the total pigment content measured at the surface, suggesting that cell could migrate downward more than 2 mm as a photoregulatory response. Colloidal carbohydrates patterns paralleled the vertical migration movements, highlighting their possible role in diatom motility. Our data strongly suggests a wavelength and Qphar dependent light stress threshold that triggers upward and downward movements to position microphytobenthic diatoms at their optimal depth.

Effects of a temperature rise on Atlantic salmon, Salmo salar, melatonin and thyroid hormones during smoltification - Nisembaum, Laura Gabriela; Martin, Patrick; Fuentès, Michael; Besseau, Laurence; Magnanou, Elodie; McCormick, Stephen D; Jack Falcon (Journal of Comparative Physiology B, 2020)
Smoltification prepares juvenile Atlantic salmon (Salmo salar) for downstream migration. Dramatic changes characterize this crucial event in the fish life cycle, including gills’ Na+/K+-ATPase activity (NKA) and plasma hormonal levels. The triggering of smoltification relies on photoperiod and is modulated by temperature. Both provide reliable information, to which fish adapted for thousands of years, that allows deciphering daily and calendar time. Here we studied the impact of different photoperiod (natural, sustained winter solstice) and temperature (natural, ~ +4°C) combinations, on gills’ NKA, plasma free triiodothyronine (T3), thyroxine (T4) and melatonin (MEL; the time-keeping hormone), throughout smoltification. We also studied the impact of temperature history on pineal gland MEL production in vitro. The spring increase in gills’ NKA was less pronounced in smolts kept under sustained winter photoperiod and/or elevated temperature. Plasma thyroid hormones levels displayed day-night variations, which were affected by elevated temperature, either independently from photoperiod (decrease in T3 levels) or under natural photoperiod exclusively (increase in T4 nocturnal levels). Nocturnal MEL secretion was potentiated by the elevated temperature, which also altered MEL profile under sustained winter photoperiod. Temperature also affected pineal MEL production in vitro, a response that depended on previous environmental acclimation of the organ. The results support the view that the salmon pineal is a photoperiod and temperature sensor, highlight the complexity of the interaction of these environmental factors on S. salar endocrine system, and suggest that climate change might compromise salmon’s time “deciphering” and processes such as smoltification, downstream migration and seawater residence.
Keywords: Atlantic salmon; melatonin; smoltification; Temperature; thyroid hormones

Effects of a temperature rise on melatonin and thyroid hormones during smoltification of Atlantic salmon, Salmo salar - Nisembaum, Laura Gabriela; Martin, Patrick; Fuentès, M; Besseau, Laurence; Magnanou, Elodie; McCormick, Stephen; Falcón, Jack (J Comp Physiol B, 2020)
Smoltification prepares juvenile Atlantic salmon (Salmo salar) for downstream migration. Dramatic changes characterize this crucial event in the salmon’s life cycle, including increased gill Na+/K+-ATPase activity (NKA) and plasma hormone levels. The triggering of smoltification relies on photoperiod and is modulated by temperature. Both provide reliable information, to which fish have adapted for thousands of years, that allows deciphering daily and calendar time. Here we studied the impact of different photoperiod (natural, sustained winter solstice) and temperature (natural, ~ + 4° C) combinations, on gill NKA, plasma free triiodothyronine (T3) and thyroxine (T4), and melatonin (MEL; the time-keeping hormone), throughout smoltification. We also studied the impact of temperature history on pineal gland MEL production in vitro. The spring increase in gill NKA was less pronounced in smolts kept under sustained winter photoperiod and/or elevated temperature. Plasma thyroid hormone levels displayed day–night variations, which were affected by elevated temperature, either independently from photoperiod (decrease in T3 levels) or under natural photoperiod exclusively (increase in T4 nocturnal levels). Nocturnal MEL secretion was potentiated by the elevated temperature, which also altered the MEL profile under sustained winter photoperiod. Temperature also affected pineal MEL production in vitro, a response that depended on previous environmental acclimation of the organ. The results support the view that the salmon pineal is a photoperiod and temperature sensor, highlight the complexity of the interaction of these environmental factors on the endocrine system of S. salar, and indicate that climate change might compromise salmon’s time “deciphering” during smoltification, downstream migration and seawater residence.
Keywords: Atlantic salmon; melatonin; Temperature; thyroid hormones

Eleotris (Teleostei: Eleotridae) of the Indian Ocean: an overview with the description of three new species - Marion Mennesson; Philippe Keith (Cybium, 2020)

Elevated estradiol-17β levels inhibit final oocyte maturation via G protein-coupled estrogen receptor (Gper) in yellowfin porgy, Acanthopagrus latus - Jeng, Shan-Ru; Thomas, Peter; Pang, Yefei; Sylvie Dufour; Lin, Chien-Ju; Yueh, Wen-Shiun; Chang, Ching-Fong (General and Comparative Endocrinology, 2020)

Endocrinology: An evolutionary perspective on neuroendocrine axes in teleosts - Sylvie Dufour; Karine Rousseau (The Physiology of Fishes, Fifth Edition, 2020)

Establishment and population features of the non-native Atlantic rangia, Rangia cuneata (Mollusca: Bivalvia), in northwestern France - Robin Faillettaz; Christophe Roger; Michel Mathieu; Jean-Paul Robin; Katherine Costil (Aquatic Invasions, 2020)
The presence of shells of the Atlantic rangia, Rangia cuneata, a brackish-water species native from the Gulf of Mexico also known as gulf wedge clam, was reported in 2017 on the French coasts of the English Channel, in the waterway that connects Caen to the sea. However, no information was available on whether a population of this alien species had successfully established in the region. Here, only empty shells—except for one live individual—were sampled in that waterway, and the sampling was shifted to the nearby marina of Ouistreham, where water is mesohaline (6.89 ± SD 0.06 PSU). In spring 2017, the mean density in the marina reached 110.45 ± 86.08 ind m-2, largely dominating the benthos community. The population was mostly composed of fairly large individuals, with no young-of-the-year found inside the marina. The modal values of the size frequency distribution ranged between 35 and 40 mm shell length. The growth patterns determined from the annual rings suggest a maximum lifespan of eight completed years. Following the assumption that colonization occurred at the larval stage, as in other European countries, this population may have established in 2009, i.e. only four years after its first detection in Europe, in the Antwerp harbour. The specimens collected are the largest recorded in European waters, suggesting that a highly suitable environment for the species in the region. Given the invasive potential of Atlantic rangia within the last decade, a close monitoring of this population and of the spread of the species in French and European waters appears necessary to determine its impacts on these ecosystems.
Keywords: Alien species; brackish waters; density; Growth; Normandy (F); Reproduction; The Atlantic rangia

Evidence for better microphytobenthos dynamics in mixed sand/mud zones than in pure sand or mud intertidal flats (Seine estuary, Normandy, France) - Morelle, Jérôme; Pascal Claquin; Francis Orvain (PLOS ONE, 2020)
Understanding the dynamics of microphytobenthos biomass and photosynthetic performances in intertidal ecosystems will help advance our understanding of how trophic networks function in order to optimize ecological management and restoration projects. The main objective of this study was to investigate microphytobenthic biomass and photosynthetic performances as a function of the sedimentary and environmental variabilities in the range of intertidal habitats in the downstream Seine estuary (Normandy, France). Our results highlight higher biomass associated with more stratified biofilms and better photosynthetic performances in areas characterized by a sand/mud mixture (40–60% of mud) compared to pure sand or pure mud environments. This type of sediment probably offers an efficient trade-off between the favorable characteristics of the two types of sediments (sand and mud) with respect to light penetration and nutrient accessibility. Moreover, the large quantities of exopolysaccharides produced in sand/mud mixtures emphasizes the functional role played by microphytobenthos in promoting sediment stability against erosion. This allows us to show that despite the strong increase in sand content of the downstream Seine estuary, intertidal flats are still productive since microphytobenthic biomass, photosynthetic performances and exopolysaccharides secretion are highest in sand-mud mixtures. This study also underlines the impact of ecosystem modifications due to human disturbance and climate change on the dynamics of key primary producers in estuaries.

Exploring brain diversity in crustaceans: sensory systems of deep vent shrimpsAbstract - Machon, Julia; Krieger, Jakob; Magali Zbinden; Juliette Ravaux; Harzsch, Steffen (Neuroforum, 2020)

Exploring community assembly among Javanese and Balinese freshwater shrimps (Atyidae, Palaemonidae) through DNA barcodes - Hernawati, Rena; Nurhaman, Ujang; Busson, Frederic; Suryobroto, Bambang; Hanner, Robert; Philippe Keith; Wowor, Daisy; Hubert, Nicolas (Hydrobiologia, 2020)
Species proliferate through evolutionary mechanisms but coexist through ecological dynamics. As such, it might be expected that mechanisms of speciation and species maintenance jointly influence the settlement of ecological communities, a process called community assembly. Disentangling the relative contribution of evolutionary and ecological dynamics might be a difficult task, particularly so for the tropical biotas due to their extreme diversity and large knowledge gaps. Here, we explore genetic diversity and distribution of 23 freshwater shrimp species of the genera Caridina and Macrobrachium in Sundaland to examine patterns of species co-occurrence based on 1583 observations across 19 sites in Java and Bali islands. DNA-based species delimitation methods applied to 204 cytochrome oxidase I sequences detected 30 operational taxonomic units and a few cases of deep intraspecific divergence. Species co-occurrence and phylogenetic community structure show no departure from expectations under a random distribution of species in landscapes and support a lottery model of community assembly. Species age estimates expand beyond the geological settlement of Sundaland, suggesting that species proliferation and community assembly are driven by mechanisms acting at distinct spatial and temporal scales.
Keywords: Caridina; Dispersa; Lottery model; Macrobrachium; Phylogenetic community structure; Species delimitation

Exposure to Artificial Light at Night and the Consequences for Flora, Fauna, and Ecosystems - Falcón, Jack; Torriglia, Alicia; Attia, Dina; Viénot, Françoise; Gronfier, Claude; Behar-Cohen, Francine; Martinsons, Christophe; Hicks, David (Frontiers in Neuroscience, 2020)

Fatty acid compositions of four benthic species along the salinity gradient of a human impacted and mangrove dominated tropical estuary (Can Gio, Vietnam) - Frank David; Marchand, Cyril; Van, Vinh Truong; Taillardat, Pierre; Thanh-Nho, Nguyen; Tarik Meziane (Journal of Sea Research, 2020)
Tropical estuaries are characterised by high spatial and temporal variability in the conditions they provide for living organisms, which in turn may affect their biochemical composition. Anthropogenic contaminants such as nutrients, antibiotics, pesticides and trace metals may also affect the biochemical composition of these coastal organisms, notably with regard to fatty acids (FA), of which optimal species-specific polyunsaturated FA ratios are required to maintain living species in healthy conditions. The objective of this study was to evidence changes in the FA profile of four ubiquist benthic species in relation to the salinity gradient of a human impacted and mangrove dominated tropical estuary (Can Gio, Southern Vietnam). Among the four benthic species studied, two exhibited spatial and seasonal changes in their FA composition: the varunid crab Metaplax elegans and the predatory mangrove murex snail Chicoreus capucinus. Proportions of the FA 16:1ω7, proportions of highly unsaturated FA and ratios of eicosapentanoic acid/arachidonic acid in the tissues of both species seemed related to upstream inputs. Different relative abundances of benthic microalgae affected both claw muscle and hepatopancreas FA composition of M. elegans, while the FA composition of C. capucinus shows that the influence of prey's diet might be transferred within trophic chains. Finally, some species, such as Nerita balteata and Metapenaeus ensis might have more adaptive capacities, because of their mobility, or because of their specific metabolic pathways, minimizing the potential impact of spatial and/or temporal changes in food resources quality. A starvation experiment involving N. balteata actually revealed the metabolic synthesis of non-methylene interrupted FA that may confer cell membranes a higher resistance to external stressors than common polyunsaturated FA. Our study highlights the future possibility of using the FA composition of sentinel organisms (i.e. feeding on specific food resources and/or especially subject to environmental stresses) as a bioindicator tool to assess mangrove ecosystems health.

First Occurrence of the Genus Australatya (Crustacea: Decapoda: Atyidae) in Melanesia and Polynesia with Description of a New Species - Lorang, Camille; Marquet, Gérard; de Mazancourt, Valentin (Pacific Science, 2020)
During specific inventories led by the Muséum national d'Histoire naturelle (MNHN, Paris), numerous specimens of Atyidae, particulary of Atya-like shrimps were collected in Melanesia (Vanuatu, Solomon Islands) and in Polynesia (Futuna, Samoa). These specimens were morphologically and genetically examined. Our study revealed that some specimens belonged to a new species in the genus AustralatyaChace, 1983. The aim of this paper is to describe this new species, Australatya keithi sp. nov., and discuss the distribution of its genus in the studied area.

The food source of Sargasso Sea leptocephali - Miller, Michael J.; Hanel, Reinhold; Eric Feunteun; Tsukamoto, Katsumi (Marine Biology, 2020)

Food sources, digestive efficiency and resource allocation in the sea cucumber Holothuria forskali (Echinodermata: Holothuroidea): Insights from pigments and fatty acids - Frank David; Cédric Hubas; Laguerre, Helène; Badou, Aicha; Herault, Gwen; Bordelet, Théo; Ameziane, Nadia (Aquaculture Nutrition, 2020)
Various research projects in Europe and North Africa have recently intended to breed temperate holothurians to alleviate fishing pressure on natural populations. However, to date little is known about the nutritional requirements of East Atlantic and Mediterranean species. In this study, we propose a “natural population”-oriented approach to characterize food sources, digestive efficiency and resources allocation based on the composition of pigments and fatty acids (FA) in gut contents and tis- sues (muscles, gonads and digestive tract walls) of wild individuals of the species Holothuria (Panningothuria) forskali (Delle Chiaje, 1823) sampled in Brittany (France). Our study reveals that neither green nor red algae enter the diet of H. forskali in spring and that the only fresh vegetal material found in gut contents is brown algae (very likely diatoms). The high nutritional quality of gut contents however contrasts with the detrital nature of the ingested food sources, suggesting that a trophic up- grading of organic matter occurs before digestion. In addition, unusual FA (i.e. only present in a few groups of living species) such as long-chain monounsaturated FA (especially the FA 23:1ω9) were found in large proportions in muscles and gonad and their effect on sea cucumber fitness needs further investigation.
Keywords: echinoderms; fatty acids; gut contents; Holothuria forskali; pigments; sea cucumbers

Freshwater gobies 30 million years ago: New insights into character evolution and phylogenetic relationships of †Pirskeniidae (Gobioidei, Teleostei) - Reichenbacher, Bettina; Přikryl, Tomáš; Cerwenka, Alexander F.; Philippe Keith; Gierl, Christoph; Dohrmann, Martin (PLOS ONE, 2020)

Functional diversity of microboring Ostreobium algae isolated from corals - Massé, Anaïs; Tribollet, Aline; Tarik Meziane; Bourguet‐Kondracki, Marie‐Lise; Yéprémian, Claude; Sève, Charlotte; Thiney, Najet; Longeon, Arlette; Couté, Alain; Domart‐Coulon, Isabelle (Environmental Microbiology, 2020)
The filamentous chlorophyte Ostreobium sp. dominates shallow marine carbonate microboring communities, and is one of the major agents of reef bioerosion. While its large genetic diversity has emerged, its physiology remains little known, with unexplored relationship between genotypes and phenotypes (endolithic versus free‐living growth forms). Here, we isolated nine strains affiliated to two lineages of Ostreobium (>8% sequence divergence of the plastid gene rbcL), one of which was assigned to the family Odoaceae, from the fast‐growing coral host Pocillopora acuta Lamarck 1816. Free‐living isolates maintained their bioerosive potential, colonizing pre‐bleached coral carbonate skeletons. We compared phenotypes, highlighting shifts in pigment and fatty acid compositions, carbon to nitrogen ratios and stable isotope compositions (δ13C and δ15N). Our data show a pattern of higher chlorophyll b and lower arachidonic acid (20:4ω6) content in endolithic versus free‐living Ostreobium. Photosynthetic carbon fixation and nitrate uptake, quantified via 8 h pulse‐labeling with 13C‐bicarbonate and 15N‐nitrate, showed lower isotopic enrichment in endolithic compared to free‐living filaments. Our results highlight the functional plasticity of Ostreobium phenotypes. The isotope tracer approach opens the way to further study the biogeochemical cycling and trophic ecology of these cryptic algae at coral holobiont and reef scales.

Functional kleptoplasts intermediate incorporation of carbon and nitrogen in cells of the Sacoglossa sea slug Elysia viridis - Cruz, Sónia; LeKieffre, Charlotte; Cartaxana, Paulo; Cédric Hubas; Najet Thiney; Jakobsen, Sofie; Escrig, Stéphane; Bruno Jesus; Kühl, Michael; Calado, Ricardo; Meibom, Anders (Scientific Reports, 2020)
Some sacoglossan sea slugs incorporate intracellular functional algal chloroplasts, a process termed kleptoplasty. “Stolen” chloroplasts (kleptoplasts) can remain photosynthetically active up to several months, contributing to animal nutrition. Whether this contribution occurs by means of translocation of photosynthesis-derived metabolites from functional kleptoplasts to the animal host or by simple digestion of such organelles remains controversial. Imaging of 13C and 15N assimilation over a 12-h incubation period of Elysia viridis sea slugs showed a light-dependent incorporation of carbon and nitrogen, observed first in digestive tubules and followed by a rapid accumulation into chloroplast-free organs. Furthermore, this work revealed the presence of 13C-labeled long-chain fatty acids (FA) typical of marine invertebrates, such as arachidonic (20:4n-6) and adrenic (22:4n-6) acids. The time frame and level of 13C- and 15N-labeling in chloroplast-free organs indicate that photosynthesis-derived primary metabolites were made available to the host through functional kleptoplasts. The presence of specific 13C-labeled long-chain FA, absent from E. viridis algal food, indicates animal based-elongation using kleptoplast-derived FA precursors. Finally, carbon and nitrogen were incorporated in organs and tissues involved in reproductive functions (albumin gland and gonadal follicles), implying a putative role of kleptoplast photosynthesis in the reproductive fitness of the animal host.

A functional m6 A‐RNA methylation pathway in the oyster Crassostrea gigas assumes epitranscriptomic regulation of lophotrochozoan development - Le Franc, Lorane; Bernay, Benoît; Petton, Bruno; Since, Marc; Pascal Favrel; Guillaume Rivière (The FEBS Journal, 2020)

Giuris (Teleostei: Eleotridae) from Indonesia, with description of a new species - Philippe Keith; Marion Mennesson; Sauri, S; Frédéric Busson; Delrieu-Trottin, Erwan; Limmon, G; Sukomono, T; Jiran; Risdawati, Renny; Dahruddin, Hadi; Hubert, Nicolas (Cybium, 2020)

The globally invasive small Indian mongoose Urva auropunctata is likely to spread with climate changeAbstract - Louppe, Vivien; Leroy, Boris; Herrel, Anthony; Veron, Géraldine (Scientific Reports, 2020)

Gonadotropin-inhibitory hormone in teleosts: New insights from a basal representative, the eel - Maugars, G.; Pasquier, J.; Atkinson, C.; Lafont, A.-G.; Campo, A.; Kamech, Nedia; Lefranc, B.; Leprince, J.; Sylvie Dufour; Rousseau, K. (General and Comparative Endocrinology, 2020)

Hiérarchisation de la valeur de préservation des oiseaux nicheurs à enjeux : application d’un indice intégrateur pour le département d’Ille-et-Vilaine - Frédéric Ysnel; Morel, Loïs; DEVOGEL, Pierre; ALTHERR, Thomas; Dugravot, Sébastien; MOREL, Régis; LEBAS, Jean-François (Naturae, 2020)

High fidelity of sea turtles to their foraging grounds revealed by satellite tracking and capture-mark-recapture: New insights for the establishment of key marine conservation areas - Siegwalt, Flora; Benhamou, Simon; Girondot, Marc; Jeantet, Lorène; Martin, Jordan; Bonola, Marc; Lelong, Pierre; Grand, Clément; Chambault, Philippine; Benhalilou, Abdelwahab; Murgale, Céline; Maillet, Thomas; et al. (Biological Conservation, 2020)

Highly variable taxa-specific coral bleaching responses to thermal stresses - McClanahan, T.R.; Darling, E.S.; Maina, J.M.; Muthiga, NA; D'agata, S.; Leblond, J.; Arthur, R.; Jupiter, S.D.; Wilson, S.K.; Mangubhai, S.; Ussi, A.M.; Mireille M.M. Guillaume; et al. (Marine Ecology Progress Series, 2020)
Complex histories of chronic and acute sea surface temperature (SST) stresses are expected to trigger taxon- and location-specific responses that will ultimately lead to novel coral communities. The 2016 El Niño-Southern Oscillation provided an opportunity to examine largescale and recent environmental histories on emerging patterns in 226 coral communities distributed across 12 countries from East Africa to Fiji. Six main coral communities were identified that largely varied across a gradient of Acropora to massive Porites dominance. Bleaching intensity was taxon-specific and was associated with complex interactions among the 20 environmental variables that we examined. Coral community structure was better aligned with the historical temperature patterns between 1985 and 2015 than the 2016 extreme temperature event. Additionally, bleaching responses observed during 2016 differed from historical reports during past warm years. Consequently, coral communities present in 2016 are likely to have been reorganized by both long-term community change and acclimation mechanisms. For example, less disturbed sites with cooler baseline temperatures, higher mean historical SST background variability, and infrequent extreme warm temperature stresses were associated with Acropora-dominated communities, while more disturbed sites with lower historical SST background variability and frequent acute warm stress were dominated by stress-resistant massive Porites corals. Overall, the combination of taxon-specific responses, community-level reorganization over time, geographic variation, and multiple environmental stressors suggest complex responses and a diversity of future coral communities that can help contextualize management priorities and activities.
Keywords: acclimation; Adaptation; Climate Change; community structure; Geography; Stress responses

Histamine and histidine decarboxylase in the olfactory system and brain of the common cuttlefish Sepia officinalis (Linnaeus, 1758) - Scaros, Alexia T.; Aude Andouche; Sébastien Baratte; Croll, Roger P. (Journal of Comparative Neurology, 2020)

How good is the evidence that light at night can affect human health? - Hicks, David; Attia, Dina; Behar-Cohen, Francine; Carré, Samuel; Enouf, Olivier; Jack Falcon; Gronfier, Claude; Martinsons, Christophe; Metlaine, Arnaud; Tahkamo, Leena; Torriglia, Alicia; FrançoiseViénot (Graefe's Archive for Clinical and Experimental Ophthalmology, 2020)

How to model social-ecological systems? – A case study on the effects of a future offshore wind farm on the local society and ecosystem, and whether social compensation matters - Haraldsson, M.; Raoux, A.; Riera, F.; Hay, J.; Dambacher, J.M.; Nathalie Niquil (Marine Policy, 2020)
Models of social-ecological systems (SES) are acknowledged as an important tool to understand human-nature relations. However, many SES models fail to integrate adequate information from both the human and ecological subsystems. With an example model of a future Offshore Wind Farm development and its effects on both the ecosystem and local human population, we illustrate a method facilitating a “balanced” SES model, in terms of including information from both subsystems. We use qualitative mathematical modeling, which allows to quickly analyze the structure and dynamics of a system without including quantitative data, and therefore to compare alternative system structures based on different understandings of how the system works. By including similar number of system variables in the two subsystems, we balanced the complexity between them. Our analyses show that this complexity is important in order to predict indirect and sometimes counterintuitive effects. We also highlight some conceptually important questions concerning social compensations during developmental projects in general, and wind farms in particular. Our results suggest that the more project holders get involved in various manner in the local socio-ecological system, the more society will benefit as a whole. Increased involvement through e.g. new projects or job-opportunities around the windfarm has the capacity to offset the negative effects of the windfarm on the local community. These benefits are enhanced when there is an overall acceptance and appropriation of the project. We suggest this method as a tool to support the decision-making process and to facilitate discussions between stakeholders, especially among local communities. © The Authors
Keywords: Acceptance; comparative study; Complexity; Decision making; development project; Eastern English channel; environmental impact assessment; future prospect; local participation; Network; numerical model; offshore structure; participatory approach; Perception; Qualitative modeling; quantitative analysis; Renewable energy; social impact assessment; stakeholder; wind farm

Identification and stable expression of vitellogenin receptor through vitellogenesis in the European eel - Morini, M.; Lafont, A. G.; Maugars, G.; Baloche, S.; Sylvie Dufour; Asturiano, J. F.; Pérez, L. (animal, 2020)

Identification and structural characterization of the factors involved in vitellogenesis and its regulation in the African Osteoglossiforme of aquacultural interest Heterotis niloticus (Cuvier, 1829) - Daniel Koua, N'Zi; Jesus Nuñez-Rodriguez; Orjuela, Julie; Céline Zatylny-Gaudin; Dubos, Marie-Pierre; Bernay, Benoît; Pontin, Julien; Corre, Erwan; Henry, Joël (General and Comparative Endocrinology, 2020)

In vitro effects of glyphosate-based herbicides and related adjuvants on primary culture of hemocytes from Haliotis tuberculata - Mottier, Antoine; Serpentini, Antoine; Dallas, Lorna; James, Adèle; Lebel, Jean-Marc; Katherine Costil (Fish & Shellfish Immunology, 2020)

In vitro effects of glyphosate-based herbicides and related adjuvants on primary culture of hemocytes from Haliotis tuberculata - Mottier, Antoine; Antoine Serpentini; Dallas, Lorna; James, Adèle; Lebel, Jean-Marc; Katherine Costil (Fish and Shellfish Immunology, 2020)
Glyphosate-based herbicides are among the most produced and widely-used herbicides. Studies have shown that commercial formulations and adjuvants may be more toxic to non-target organisms than the active ingredients alone, but the mechanisms of action of these chemicals remain unclear. The aim of this study was to investigate the in vitro effects of glyphosate, a commercial formulation and adjuvant alone using primary culture of hemocytes from the European abalone Haliotis tuberculata, a commonly farmed shellfish. Glyphosate was found to have negligible effects on viability, phagocytic activities and lysosome stability even with very high doses (i.e. 100 mg L-1). By contrast, greater effects on viability were observed for the commercial formulation and adjuvant alone, with EC50 values of 41.42 mg L-1 and 1.85 mg L-1, respectively. These results demonstrate that the toxic sublethal effects (i.e. phagocytic activity and destabilization of lysosomal membranes) of formulated glyphosate came from adjuvants and suggest they may be related to cell and organelle membrane destabilization.
Keywords: glyphosate; Haliotis tuberculata; Hemocytes; neutral red retention assay; Phagocytosis; POEAs; viability assay

In-Depth In Silico Search for Cuttlefish Antimicrobial Peptides Following Bacterial Challenge of Haemocytes - Benoist, Louis; Houyvet, Baptiste; Henry, Joël; Corre, Erwan; Zanuttini, Bruno; Céline Zatylny-Gaudin (Marine Drugs, 2020)

Influence of larval and juvenile life history on age at first maturity in two tropical amphidromous fish species - Lagarde, Raphaël; Teichert, Nils; Grondin, Henri; Hue, Thomas; Gaudin, Philippe; Ponton, Dominique (Ecology of Freshwater Fish, 2020)

Influence of the physiological condition of bivalve recruits on their post-settlement dispersal potential - Martin Forêt; Frédéric Olivier; Miner, P; Gesche Winkler; Nadalini, J-B; Réjean Tremblay (Marine Ecology Progress Series, 2020)
Secondary dispersal (= migration) of bivalves occurs after metamorphosis and is a key recruitment process that can radically change patterns of primary settlement. An example of secondary dispersal is active migration behavior of bivalve recruits such as in bysso-pelagic drift. We hypothesize that these active migrations represent an energy cost for recruits and that the ability to actively migrate will depend upon the recruit¬ís physiological profile (quantity and quality of energy reserves). In lab experiments, we hatched 4 batches of recruits of Venus verrucosa with different physiological profiles by varying rearing temperature and diet composition. We then introduced these recruits into a fall velocity tube (5 m height) to estimate their vertical fall velocity as a proxy of their dispersal potential: slower fall velocity implies enhanced dispersal potential. We also compared alive vs. passive (dead) recruits to assess behavioral differences. Fall velocity increased logarithmically with recruit volume for each treatment, and no differences between active and passive individuals were observed for batches reared at 20°C with a mixture of Tisochrysis lutea and Chaetoceros gracilis. By contrast, active recruits in 2 other treatments (T. lutea at 20°C and a mix of C. gracilis and T. lutea at 15°C) significantly decreased their fall velocity regardless of their volume. Moreover, the ability of recruits to control their fall velocity by their behavior was correlated with triglyceride content. Recruits with the highest energy reserves had the greatest capacity to decrease their fall velocity, which suggests a major role of physiological conditions on potential secondary dispersal. We also used a benthic flume to test the substrate selection ability of recruits depending on their physiological profile and found no differences between physiologically different batches. However, V. verrucosa recruits preferred fine sediments, unlike adults, which live mainly in coarse sediment habitats; such difference in substrate preference suggests potential secondary migrations between nursery and adult areas.
Keywords: Behavior; Bivalves recruits; Energetic reserves; Physiology; secondary migrations; Venus verrucosa

An integrated investigation of the effects of ocean acidification on adult abalone (Haliotis tuberculata) - Avignon, Solène; Stéphanie Auzoux-Bordenave; Martin, Sophie; Dubois, Philippe; Badou, Aicha; Coheleach, Manon; Richard, Nicolas; Di Giglio, Sarah; Malet, Loïc; Servili, Arianna; Gaillard, Fanny; Huchette, Sylvain; et al. (ICES Journal of Marine Science, 2020)
Ocean acidification (OA) and its subsequent changes in seawater carbonate chemistry are threatening the survival of calcifying organisms.Due to their use of calcium carbonate to build their shells, marine molluscs are particularly vulnerable. This study investigated the effect of CO2-induced OA on adult European abalone (Haliotis tuberculata) using a multi-parameter approach. Biological (survival, growth), physiological (pHT of haemolymph, phagocytosis, metabolism, gene expression), and structural responses (shell strength, nano-indentation measurements,Scanning electron microscopy imaging of microstructure) were evaluated throughout a 5-month exposure to ambient (8.0) and low (7.7) pH conditions. During the first 2 months, the haemolymph pH was reduced, indicating that abalone do not compensate for the pH decrease of their internal fluid. Overall metabolism and immune status were not affected, suggesting that abalone maintain their vital functions when facing OA. However, after 4 months of exposure, adverse effects on shell growth, calcification, microstructure, and resistance were highlighted, whereas the haemolymph pH was compensated. Significant reduction in shell mechanical properties was revealed at pH 7.7, suggesting that OA altered the biomineral architecture leading to a more fragile shell. It is concluded that under lower pH, abalone metabolism is maintained at a cost to growth and shell integrity. This may impact both abalone ecology and aquaculture.
Keywords: Abalone; calcification; Gene Expression; Growth; mechanical properties; Ocean acidification; Physiology; shell microstructure

InvaCost, a public database of the economic costs of biological invasions worldwideAbstract - Diagne, C.; Leroy, B.; Gozlan, R. E.; Vaissière, A.-C.; Assailly, C.; Nuninger, L.; Roiz, D.; Jourdain, F.; Jarić, I.; Courchamp, F. (Scientific Data, 2020)

InvaCost, a public database of the economic costs of biological invasions worldwide - Diagne, C.; Leroy, B.; Gozlan, R. E.; Vaissière, A.-C.; Assailly, C.; Nuninger, L.; Roiz, D.; Jourdain, F.; Jarić, I.; Courchamp, F. (Scientific Data, 2020)

Involvement of GLWamide neuropeptides in polyp contraction of the adult stony coral Euphyllia ancora - Shikina, Shinya; Chiu, Yi-Ling; Zhang, Yan; Yi-ChenYao; Liu, Tai-Yu; Tsai, Pin-Hsuan; Céline Zatylny-Gaudin; Chang, Ching-Fong (Scientific Reports, 2020)
The existence and function of neurons remain largely unexplored in scleractinian corals. To gain a better understanding of neuronal functions in coral physiology, this study focused on Glycine-Leucine-Tryptophan-amide family neuropeptides (GLWamides), which have been shown to induce muscle contraction and larval metamorphosis in other cnidarians. Molecular identification and functional characterization of GLWamides in the adult stony coral Euphyllia ancora were performed. We successfully elucidated the full-length cDNA of GLWamide preprohormone in E. ancora (named EaGLW preprohormone). The deduced amino acid sequence was predicted to contain six potential GLWamide peptides. Tissue distribution analysis demonstrated that transcripts of EaGLW preprohormone were mainly expressed in the mouth (including the pharynx) and tentacles of the polyps. Immunodetection with an anti-GLWamide monoclonal antibody revealed that GLWamide neurons were mainly distributed in the epidermis of the mouth region and tentacle, in agreement with the distribution patterns of the transcripts. Treatment of the isolated mouth and tentacles with synthetic GLWamide peptides induced the contraction of these isolated tissues. Treatment of polyps with synthetic GLWamide peptides induced the contraction of polyps. These results suggest that GLWamides are involved in polyp contraction (myoactivity) in adult scleractinians. Our data provide new information on the physiological function of neuropeptides in scleractinians.

Isotopic analyses, a good tool to validate models in the context of Marine Renewable Energy development and cumulative impacts - Raoux, A.; Pezy, J.-P.; Ernande, B.; Nathalie Niquil; Dauvin, J.-C.; Grangeré, K. (Estuarine, Coastal and Shelf Science, 2020)
As part of the energy transition, the French government is planning Offshore Wind Farm (OWF) constructions in the next decades. An integrated ecosystem approach of two future OWF sites of the Eastern English Channel (Courseulles-sur-mer and Dieppe-Le Tréport) was developed to model the marine ecosystems before the OWF implementation. Such ecosystem models allow simulating the possible reef and reserve effects associated to the presence of the farm, and to character the overall changes in the food-web functioning. This holistic view of OWF effects could be replicated on other sites and form the basis of an ecosystem based management of marine renewable energies. However, to use these models for management purpose, they need to be validated. In order to do so, stable isotope ratios of nitrogen were used for determining the accuracy of the effective trophic levels computed in these two models. Results showed that trophic levels estimated by the two models were consistent with the trophic levels estimated by the independent isotopic data. In the context of OWF development and cumulative impacts analysis, this step of validation of the models is essential for developing their use by management actors and policy makers. © 2020 Elsevier Ltd
Keywords: alternative energy; detection method; Dieppe; Ecopath with Ecosim; ecosystem approach; English Channel; food web; France; Isotopic nitrogen analysis; marine ecosystem; model validation; Normandie; Offshore wind farm; policy making; Seine Maritime; trophic level; wind farm