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Chouvelon, Tiphaine; Strady, Emilie; Harmelin-Vivien, Mireille; Radakovitch, Olivier; Brach-Papa, Christophe; Crochet, Sylvette; Knoery, Joël; Rozuel, Emmanuelle; Thomas, Bastien; Tronczynski, Jacek; Chiffoleau, Jean-François
Marine pollution bulletin, 09/2019, Volume: 146Journal Article
Trace metal contamination in the European sardine and anchovy food web was investigated in the Gulf of Lions, NW Mediterranean Sea, including seawater and size fractions of plankton. The results highlighted: i) higher and more variable concentrations in the smaller plankton size classes for all metals except cadmium; ii) higher concentrations in anchovy versus sardine for all elements except lead; iii) different patterns of metal bioaccumulation through the food web: cobalt, nickel, copper, silver, lead and zinc displayed continuously decreasing concentrations (with the exception of increased zinc in fish only), while mercury concentrations dropped considerably in larger plankton size classes and rose significantly in fish. Lastly, cadmium concentrations were found to be highest in intermediate plankton size classes, with very low levels in fish. The need to efficiently characterize the biological composition of plankton in order to fully identify its role in the mobilization and transfer of metals was highlighted. Display omitted •Higher concentrations were generally found in water samples from western stations.•Few or no significant spatial variations were tested or highlighted for biota.•Contrasted bioaccumulation patterns of trace metals along the food web were found.•Concentrations differed greatly among size fractions of plankton.•Anchovy presented higher concentrations than sardine for all metals except Pb.
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