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Influence of food (ciliate and phytoplankton) on the trophic transfer of inorganic and methyl-mercury in the Pacific cupped oyster Crassostrea gigas.
Metian, Marc; Pouil, Simon; Dupuy, Christine; Teyssié, Jean-Louis; Warnau, Michel; Bustamante, Paco.
Afiliación
  • Metian M; International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco. Electronic address: m.metian@iaea.org.
  • Pouil S; International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
  • Dupuy C; Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-La Rochelle Université, 2 rue Olympe de Gouges, F-17000, La Rochelle, France.
  • Teyssié JL; International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
  • Warnau M; International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
  • Bustamante P; Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-La Rochelle Université, 2 rue Olympe de Gouges, F-17000, La Rochelle, France.
Environ Pollut ; 257: 113503, 2020 Feb.
Article en En | MEDLINE | ID: mdl-31761584
Diet is an important route of mercury (Hg) uptake in marine organisms. Trophic transfer of Hg throughout the food webs may be influenced by various factors, including diet and Hg speciation. Bivalves such as oysters are widely used as bioindicators of trace element pollution such as Hg. Nevertheless, our current knowledge regarding their ability to accumulate Hg from their diet is mainly based on experiments performed using phytoplankton. In their natural environment, oysters feed on a variety of food items including ciliates, detritus, in addition to phytoplankton. The present study aimed at examining the influence of diet composition on the trophic transfer of inorganic Hg (iHg) and methylmercury (MeHg) in the Pacific cupped oyster Crassostrea gigas. The pulse-chase feeding method was used with two radiolabeled food items: a heterotrophic protist (Uronema marinum) and a phytoplanktonic diatom (Thalassiosira pseudonana). Depuration of dietary Hg in the oysters was followed for 50 d. Kinetic parameters including assimilation efficiency (AE) and efflux rate constant (ke) were calculated. Our results showed that oysters fed on ciliates assimilated 96 ±â€¯1% and 31 ±â€¯2% of the ingested MeHg and iHg, respectively whereas these elements were similarly assimilated in the oysters fed on phytoplankton (78 ±â€¯3% and 86 ±â€¯4% for MeHg and iHg, respectively). Mercury assimilation in oyster is thus diet dependent (significant differences in AE, p < 0.05), metal species-dependent and likely resulting from variations in Hg bioavailability in the two food items tested and a gut passage time-dependent of the ingested matrix.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Cadena Alimentaria / Crassostrea / Compuestos de Metilmercurio Límite: Animals Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2020 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Cadena Alimentaria / Crassostrea / Compuestos de Metilmercurio Límite: Animals Idioma: En Revista: Environ Pollut Asunto de la revista: SAUDE AMBIENTAL Año: 2020 Tipo del documento: Article Pais de publicación: Reino Unido