Delineation of heavy metal contamination pathways (seawater, food and sediment) in tropical oysters from New Caledonia using radiotracer techniques

Marine Pollution Bulletin
Laetitia HédouinMichel Warnau

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 (T(b1/2)>or=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%).

References

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Citations

Mar 16, 2013·Marine Environmental Research·Maya Al-Sid-CheikhEmilien Pelletier
Dec 25, 2015·Journal of Environmental Radioactivity·Marc MetianMichel Warnau
Jul 3, 2015·Journal of Environmental Radioactivity·Simon PouilMarc Metian
Apr 5, 2016·International Journal of Environmental Research and Public Health·Freda F TeiD C Ghislaine Mayer
May 18, 2016·Marine Pollution Bulletin·Wahyu Retno PrihatiningsihDedy Soedharma
May 20, 2016·Bulletin of Environmental Contamination and Toxicology·Harriet Kuranchie-MensahMarc Metian
Mar 7, 2017·Environmental Pollution·Guang-Yuan LuWen-Xiong Wang
Mar 11, 2017·Environmental Science and Pollution Research International·Laetitia HédouinMichel Warnau
Jun 27, 2021·Environmental Toxicology and Pharmacology·Budiawan BudiawanWahyu Retno Prihatiningsih
Jun 12, 2013·Environmental Science & Technology·Qiao-Guo TanWen-Xiong Wang

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