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Determination of diet in Manila clams by spatial analysis of stable isotopes ArchiMer
Dang, C.; Sauriau, Pierre-guy; Savoye, N.; Caill-milly, Nathalie; Martinez, P.; Millaret, C.; Haure, Joel; De Montaudouin, X..
Spatial changes in the dietary regime of Ruditapes philippinarum from intertidal sediments of Arcachon Bay were depicted by analyzing stable isotope ratios in both its adductor muscles and potential trophic sources. Manila clams were collected from 50 sites in May to June 2006. Dietary reconstruction was based on the IsoSource mixing model, considering trophic enrichments of 3.5%. for carbon and 3.0%. for nitrogen, which were determined experimentally. delta C-13 and delta N-15 values, respectively, averaged -28.2 and 5.2 parts per thousand for riverine particulate organic matter (POM), -20.6 and 4.7 parts per thousand for inner bay phytoplankton, -21.0 and 5.6%. for outer bay phytoplankton, -16.8 and 4.8 parts per thousand. for microphytobenthos, -18.4...
Tipo: Text Palavras-chave: SW France; Arcachon Bay; Spatial variability; Mixing model; Trophic sources; C and N stable isotopes; Muscle; Ruditapes philippinarum.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-6886.pdf
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Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale ArchiMer
Dubois, S.; Savoye, N.; Gremare, Antoine; Plus, Martin; Charlier, K.; Beltoise, A.; Blanchet, Hugues.
The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay - a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe - using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of...
Tipo: Text Palavras-chave: Sediment organic matter; Primary producers; C and N stable isotopes; Zostera noltii; Arcachon Bay.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00073/18426/16059.pdf
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Sources of organic matter for flatfish juveniles in coastal and estuarine nursery grounds: A meta-analysis for the common sole (Solea solea) in contrasted systems of Western Europe ArchiMer
Le Pape, Olivier; Moderan, J.; Beaunee, G.; Riera, Pascal; Nicolas, Delphine; Savoye, N.; Harmelin-vivien, M.; Darnaude, A. M.; Brind'Amour, Anik; Le Bris, H.; Cabral, H.; Vinagre, C.; Pasquaud, S.; Franca, S.; Kostecki, Caroline.
Coastal and estuarine nursery grounds are essential habitats for sustaining flatfish stocks since only these shallow and productive areas provide the high food supply that allows maximizing juvenile growth and survival in most flatfish species. However, the main organic matter sources at the basis of benthic food webs might differ drastically between estuarine nursery grounds under strong freshwater influences, where food webs are mainly supported by continental organic matter, and coastal ecosystems under limited freshwater influence, where the local marine primary production is the main source of carbon for the benthos. To better understand the links between continental inputs to the coastal zone and stock maintenance in the highly prized common sole,...
Tipo: Text Palavras-chave: Nursery ground; Flatfish; Organic matter origin; Stable isotopes; Mixing model SIAR.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00118/22889/20796.pdf
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Spatial and temporal distribution of mercury and methylmercury in bivalves from the French coastline ArchiMer
Briant, Nicolas; Chouvelon, Tiphaine; Martinez, Laura; Brach-papa, Christophe; Chiffoleau, Jean-francois; Savoye, N.; Sonke, J.; Knoery, Joel.
Marine mercury (Hg) concentrations have been monitored in the French coastline for the last half a century using bivalves. The analyses presented in this study concerned 192 samples of bivalves (mussels: Mytilus edulis and Mytilus galloprovincialis and oysters: Crassostrea gigas and Isognomon alatus) from 77 sampling stations along the French coast and in the French Antilles sea. The goals of this study were to assess MeHg levels in various common bivalves from French coastline, and to identify possible geographic, taxonomic or temporal variations of concentrations. We show that the evolution of methylmercury (MeHg) concentrations covary with total mercury (HgT) concentrations. Moreover, in most of the study sites, HgT concentrations have not decreased...
Tipo: Text Palavras-chave: Mercury; Methylmercury; France; Bivalves; Speciation.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00353/46465/46398.pdf
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Stable isotopes changes in the adductor muscle of diseased bivalve Ruditapes philippinarum ArchiMer
Dang, Cecile; De Montaudouin, X.; Savoye, N.; Caill-milly, Nathalie; Martinez, P.; Sauriau, Pierre-guy.
In this article, we show how a disease could bias stable isotope analyzes of trophic networks and propose a strategy in the choice of tissues to be analyzed. In the past few years, a new pathology (brown muscle disease or BMD) affecting the posterior adductor muscle of Ruditapes philippinarum has emerged in Arcachon Bay. BMD induces a necrosis of muscle tissues which become infused by conchiolin and hence calcified. As muscle of mollusks are often used for trophic food webs studies through stable isotopic analyzes, this work investigated the effect of BMD on carbon and nitrogen isotopic ratios of anterior and posterior adductor muscles of clams collected in February and August 2007. Infected clams displayed a lower condition index and a posterior adductor...
Tipo: Text Palavras-chave: Calcification; Disease; Adductor muscle; Stable isotopes; Ruditapes philippinarum; Clam.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/2009/publication-6270.pdf
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