Assessment of health status of oysters ( Crassostrea gigas ) exposed to environmentally relevant concentrations of Ag and Cu in brackish waters - Archive ouverte HAL
Article Dans Une Revue Journal of Sea Research (JSR) Année : 2017

Assessment of health status of oysters ( Crassostrea gigas ) exposed to environmentally relevant concentrations of Ag and Cu in brackish waters

Résumé

Human activities have altered estuarine environments leading to increased presence of different pollutants including metals. Although the implementation of new environmental policies has caused a considerable decrease in trace metal concentrations in estuaries around the Bay of Biscay, some elements such as copper (Cu) and silver (Ag) are still present in relatively high concentrations. Oysters have been widely used in environmental biomonitoring programs as sentinel organisms. Oysters Crassostrea gigas from an uncontaminated estuary were exposed to sublethal, environmentally relevant concentrations of Cu (2000 ng Cu/L) and Ag (500 ng Ag/L) during 14 days in brackish water (S = 18). A battery of cell and tissue level (exposure) biomarkers at different levels of biological complexity was applied and integrated into the Integrative Biological Response (IBR) index including: metallothionein contents, intralysosomal metal accumulation, digestive gland atrophy and digestive gland tissue integrity. Condition Index (CI) was incorporated into the IBR index as a complementary parameter that reflects the general physiological condition of oysters (organism level). Results indicated an increase in intralysosomal metal accumulation after 7 and 14 days of exposure to Ag together with an increase in the digestive epithelium atrophy and lipofuscin content after 7 days of exposure to Ag. The responses detected with the aid of biomarkers integrated in the IBR index showed higher toxicity in oysters exposed to Ag, inducing the clear onset of detoxification processes which also occurred, to a lower extent, in Cu-exposed oysters.
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Dates et versions

hal-04714362 , version 1 (30-09-2024)

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Ane Rementeria, Mathilde Mikolaczyk, Ainhize Peña, Laurent Lanceleur, Gerard Blanc, et al.. Assessment of health status of oysters ( Crassostrea gigas ) exposed to environmentally relevant concentrations of Ag and Cu in brackish waters. Journal of Sea Research (JSR), 2017, 130, pp.229-238. ⟨10.1016/j.seares.2017.04.013⟩. ⟨hal-04714362⟩

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