@article {8534, title = {Chlordecone-contaminated epilithic biofilms show increased adsorption capacities}, journal = {Science of The Total Environment}, volume = {825}, year = {2022}, month = {Jan-06-2022}, pages = {153942}, issn = {00489697}, doi = {10.1016/j.scitotenv.2022.153942}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0048969722010348}, author = {C{\'e}dric Hubas and Monti, Dominique and Jean-Michel Mortillaro and Augagneur, Sylvie and Carbon, Anne and Duran, Robert and Karama, Solange and Tarik Meziane and Pardon, Patrick and Risser, Th{\'e}o and Tapie, Nathalie and Najet Thiney and Budzinski, H{\'e}l{\`e}ne and Lauga, B{\'e}atrice} } @article {8845, title = {Contrasting organic matter composition in pristine and eutrophicated mangroves revealed by fatty acids and stable isotopes (Rio de Janeiro, Brazil)}, journal = {Estuarine, Coastal and Shelf Science}, year = {2022}, month = {Jan-09-2022}, pages = {108061}, abstract = {Mangrove sediments have a high capacity of carbon storage, as the result of larger organic matter (OM) inputs from mangrove trees (litter fall and fine roots production) than OM microbial degradation and export to coastal waters. Mangrove sediments also act as traps for suspended matter and particulate OM (POM) from surrounding water masses. Fatty acids (FAs) markers, δ13C and δ15N signatures were used here to characterize the OM composition in three mangroves located in three coastal embayments of the Rio de Janeiro state (Brazil) with increasing urbanization from a pristine mangrove M1 to a moderately impacted mangrove M2 and a highly impacted mangrove M3. In these mangroves, the δ15N signature of tree leaves and sediments increases with anthropogenic influence, consistent with a large-scale eutrophication gradient along the three regions. At mangrove M1, predominant OM inputs from mangrove trees are highlighted by high proportions of long-chain fatty acids, particularly in the inland station, where high organic carbon concentrations (126\ {\textpm}\ 108\ mg\ g-1) indicate limited sedimentation of mineral particles and high carbon storage capacities. The sedimentary OM of M3 mangrove was more labile as confirmed by the higher proportions of algal fatty acids, enriched δ13C signature and the C/N ratio 1.6 times lower (p\ \<\ 0.001) than in the pristine mangrove M1. At the M2 mangrove site, high contribution of bacterial FAs (around 20\%) to sedimentary OM and high proportion of poorly biodegradable saturated fatty acids suggest that bacteria degrade algal labile OM in surface sediments but do not mineralize the most refractory fraction of OM. At the eutrophic M3 site, our findings suggest that deposition of labile POM induced an increase of fungal biomass on the sediment, apparently enhancing the microbial loop, and potentially leading to mineralization of refractory OM and carbon losses through a priming effect.}, issn = {02727714}, doi = {10.1016/j.ecss.2022.108061}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0272771422003195}, author = {Chynel, Mathias and Rockomanovic, Sofia and Gwena{\"e}l Abril and Barroso, Glenda and Marotta, Humberto and Machado, Wilson and Sanders, Christian J. and Najet Thiney and Tarik Meziane} } @article {5830, title = {Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland)}, journal = {Marine Ecology Progress Series}, volume = {610}, year = {2019}, pages = {15-31}, abstract = {

Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the seasonal variability of food sources on 2 dominant filter-feeding bivalves (Astarte moerchi and Mya truncata) was also investigated. Results revealed the critical impact of long sea ice/snow cover conditions prevailing in Young Sound corresponding to a period of extremely poor and degraded POM and SOM. Freshwater inputs had a very local impact during summer, with relatively more degraded POM at the surface compared to bottom waters that were less nutritionally depleted but more heterogeneous among the sampled stations. Terrestrial inputs contributed to the SOM composition but showed a large variability along the fjord. Finally, diet analyses underlined the contrasted nutritional conditions, showing much higher lipid reserves in A. moerchi than in M. truncata during winter. Under a scenario with increased freshwater input, such results suggest a decline in organic matter quality and production in Young Sound, with subsequent impacts on benthic food webs.

}, doi = {10.3354/meps12857}, url = {https://www.int-res.com/abstracts/meps/v610/p15-31/}, author = {Bridier, Guillaume and Tarik Meziane and Grall, Jacques and Laurent Chauvaud and Sejr, Mikael K. and Menneteau, Sylvain and Fr{\'e}d{\'e}ric Olivier} } @article {5465, title = {Carbon biogeochemistry and CO2 emissions in a human impacted and mangrove dominated tropical estuary (Can Gio, Vietnam)}, journal = {Biogeochemistry}, year = {2018}, month = {27/04/2018}, pages = {1-15}, abstract = {

The quantitative contribution of tropical estuaries to the atmospheric CO2\ budget has large uncertainties, both spatially and seasonally. We investigated the seasonal and spatial variations of carbon biogeochemistry downstream of Ho Chi Minh City (Southern Vietnam). We sampled four sites distributed from downstream of a highly urbanised watershed through mangroves to the South China Sea coast during the dry and wet seasons. Measured partial pressure of CO2(pCO2) ranged from 660 to 3000\ μatm during the dry season, and from 740 to 5000\ μatm during the wet season. High organic load, dissolved oxygen saturation down to 17\%, and pCO2up to 5000\ μatm at the freshwater endmember of the estuary reflected the intense human pressure on this ecosystem. We show that releases from mangrove soils affect the water column pCO2\ in this large tropical estuary (~600\ m wide and 10{\textendash}20\ m deep). This study is among the few to report direct measurements of both water pCO2\ and CO2\ emissions in a Southeast Asian tropical estuary located in a highly urbanised watershed. It shows that the contribution of such estuaries may have been previously underestimated, with CO2\ emissions ranging from 74 to 876\ mmol\ m-2\ day-1\ at low current velocity (\<\ 0.2\ m\ s-1). Corresponding gas transfer velocities k600,\ ranging from 1.7 to 11.0\ m\ day-1,\ were about 2 to 4 times of k600\ estimated using published literature equations.

}, doi = {https://doi.org/10.1007/s10533-018-0444-z}, author = {Frank David and Tarik Meziane and Tran-thi, N and Truong Van, V and Th{\`a}nh-Nho, N and Pierre Taillardat and Cyril Marchand} } @article {5315, title = {Cultured eastern oysters (Crassostrea virginica): retention and assimilation of picophytoplankton using a multi-biomarker approach}, journal = {Aquatic Living Resources}, volume = {30}, year = {2018}, month = {08/2018}, type = {Article}, abstract = {

{In this study, we investigated the food sources of eastern oysters Crassostrea virginica cultivated in Atlantic Canada. Stable isotopes (C-13 and N-15) and fatty acid biomarkers were used to identify these sources under in situ conditions for suspended (similar to 0.5 m below surface) and bottom(similar to 2 m) culture stocks. It was found that particulate organic matter represented the main food source, with major contributions from live phytoplankton. Higher lipid contents were detected in the digestive glands of suspended oysters compared to bottom oysters (p \< 0.05). Bottom oysters did not show significant preference for detrital or bacterial organic matter. Near-surface waters contained an elevated picophytoplankton biomass (PPP, 0.2-2 mu m, 1.93 +/- 0.16mg l(-1), mean +/- SEM) compared to nanophytoplankton biomass (NPP, \> 2 mu m, 1.05 +/- 0.15 mu g l(-1), mean +/- SEM). To determine whether the small size PPP was captured and assimilated by C. virginica, feeding trials were conducted in the laboratory using three PPP/NPP diets (20\%, 50\%, and 80\% PPP), consisting of isotopically-labelled (delta C-13) PPP cells (Nannochloropsis oculata) and non-labelled NPP cells (Tisochrysis lutea). An isotopically-labelled fatty acids analysis indicated PPP assimilation in various tissues (digestive gland, gills, mantle, and abductor muscle), including from oysters fed the reduced (20\%) PPP diet. Isotopic enrichment (C-13) in the FA 22:2 (non-methylene-interrupted or NMI) showed that precursors of NMIs utilized PPP carbon in its biosynthesis process. In conclusion, C. virginica assimilated primarily particulate organic matter (POM), including PPP, which dominated the phytoplankton community in near surface waters. C. virginica can exploit PPP carbon during fatty acid production and further biosynthesis.}

}, keywords = {Aquaculture, fatty acids, Picophytoplankton, Shellfish}, Stable isotopes, {Crassostrea virginica}, issn = {{0990-7440}}, doi = {{10.1051/alr/2017031}}, author = {R{\'e}mi Sonier and R{\'e}jean Tremblay and Fr{\'e}d{\'e}ric Olivier and Tarik Meziane and Comeau, Luc Andre} } @article {5210, title = {Cultured eastern oysters (Crassostrea virginica): retention and assimilation of picophytoplankton using a multi-biomarker approach}, journal = {Aquatic Living Ressources}, volume = {30}, year = {2017}, month = {08/2017}, pages = {1-13}, doi = {doi.org/10.1051/alr/2017031}, url = {https://www.alr-journal.org/articles/alr/abs/2017/01/alr170056/alr170056.html}, author = {R{\'e}mi Sonier and R{\'e}jean Tremblay and Fr{\'e}d{\'e}ric Olivier and Tarik Meziane and Comeau, L. A.} } @article {3559, title = {Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)}, journal = {J. Mar. Sci. Eng.}, year = {2015}, month = {02/2015}, pages = {52-57}, type = {OPEN ACCESS}, abstract = {

In mangrove ecosystems, strong reciprocal interactions exist between plant and substrate. Under semi-arid climate, Rhizophora spp. are usually predominant, colonizing the seashore, and Avicennia marina develops at the edge of salt-flats, which is the highest zone in the intertidal range. Along this zonation, distribution and speciation of C, Fe, S, N, and P in sediments and pore-waters were investigated. From the land-side to the sea-side of the mangrove, sediments were characterized by I/ increase in: (i) water content; (ii) TOC; (iii) mangrove-derived OM; II/ and decrease in: (i) salinity; (ii) redox; (iii) pH; (iv) solid Fe and solid P. Beneath Avicennia and Rhizophora, TS accumulated at depth, probably as a result of reduction of iron oxides and sulfate. The loss of total Fe observed towards the sea-side may be related to sulfur oxidation and to more intense tidal flushing of dissolved components. Except the organic forms, dissolved N and P concentrations were very low beneath Avicennia and Rhizophora stands, probably as a result of their uptake by the root systems. However, in the unvegetated salt-flat, NH4+ can accumulate in organic rich and anoxic layers. This study shows: (i) the evolution of mangrove sediment biogeochemistry along the intertidal zone as a result of the different duration of tidal inundation and organic enrichment; and (ii) the strong links between the distribution and speciation of the different elements.

}, keywords = {biogeochemistry, Mangrove, New Caledonia, zonation}, issn = {2077-1312}, author = {Jonhatan Deborde and Cyril Marchand and Nathalie Molnar and Luc Della-Patrona and Tarik Meziane} } @article {7334, title = {Croissance de juv{\'e}niles de Nereis diversicolor nourris avec des d{\'e}tritus d{\textquoteright}halophytes}, journal = {Oceanologica Acta}, volume = {25}, year = {2002}, month = {Jan-05-2002}, pages = {119 - 124}, issn = {03991784}, doi = {10.1016/S0399-1784(02)01187-8}, url = {https://linkinghub.elsevier.com/retrieve/pii/S0399178402011878}, author = {Tarik Meziane and Retiere, Christian} }