Delineation of heavy metal contamination pathways (seawater,food and sediment) in tropical oysters from New Caledonia using radiotracer techniques |
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| Institution: | 1. International Atomic Energy Agency – Marine Environment Laboratories (IAEA-MEL), 4 Quai Antoine 1er, MC-98000, Principality of Monaco, Monaco;2. Littoral, Environnement et Sociétés (LIENSs), UMR 6250, CNRS-Université de La Rochelle, 2 rue Olympe de Gouges, F-17042 La Rochelle Cedex 01, France;3. Institut de Recherche pour le Développement (IRD-Noumea Center), UR Camelia, BP A5, 98848 Nouméa, New Caledonia;1. International Atomic Energy Agency, Environment Laboratories, 4a Quai Antoine Ier, Monaco;2. Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS, Université de La Rochelle, 2 rue Olympe de Gouges, La Rochelle, France;1. Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China;2. State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing, 100871, China;3. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi''an University of Technology, Xi''an, 710048, China;4. College of Life Sciences, Qufu Normal University, Qufu, 273165, China;5. Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, 518055, China;6. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, 810016, China;1. International Atomic Energy Agency – Environment Laboratories, 4 Quai Antoine Ier, MC 98000 Monaco, Monaco;2. Littoral Environnement et Sociétés, UMR 7266 CNRS - Université de La Rochelle, 2 rue Olympe de Gouges, 17000 La Rochelle, France;3. Département de Biologie, Université des Antilles et de la Guyane, UMR 7138 UPMC-CNRS-MNHN-IRD, Equipe ‘biologie de la mangrove’, UFR des Sciences Exactes et Naturelles, BP 592, 97159 Pointe-à-Pitre, Guadeloupe, France |
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| Abstract: | Bioaccumulation of Ag, Cd, Co, Cr and Zn was studied in the oysters Isognomon isognomon and Malleus regula, using highly sensitive radiotracer techniques. Metals were readily bioconcentrated from the dissolved phase. Sediment exposures indicated a low bioavailability of sediment-bound metals (3–5 orders of magnitude lower than dissolved metals). In both seawater and sediment experiments, the two oysters displayed similar bioaccumulation behaviour towards all metals but Ag. Indeed, Ag was much more efficiently incorporated and retained in I. isognomon. Metals ingested with food (phytoplankton) were efficiently assimilated (34–77%) and strongly retained in oyster tissues (Tb½ ? 20 d). Estimation of the relative contribution of each exposure pathway indicated that for both species sediment was the dominant pathway for Co and Cd, whereas food was the major source of Zn. Regarding Ag, seawater was the main source for I. isognomon (86%), whereas sediment was the predominant route for M. regula (92%). |
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