John Wiley & Sons, Ltd.

Venerupis decussata under environmentally relevant lead concentrations: Bioconcentration, tolerance and biochemical alterations

0
The edible clam Venerupis decussata is widely distributed in European aquatic systems, some of them under strong anthropogenic pressure, which can contribute to trophic transfer of xenobiotics to humans. Taking into account this rationale, the present study focused on the tolerance, bioconcentration and bio chemical responses of V. decussata when submitted to ecologically relevant concentrations of lead. The human health risk due to clam's consumption was also discussed. For this purpose, an acute toxicity assay (96h) was conducted with wild clams, using a Pb exposure concentration ranging from 0 to 1.80 mg.L‐1. Lethality, bioconcentration factor (BCF), intracellular partitioning, and a relevant set of biomarkers were used as endpoints. Clams, interstitial water, water column and sediment samples were collected to analyse Pb concentration. Pb concentration in wild clams was below international consumption guidelines. Under laboratory conditions, clams revealed highly sensitivity to Pb (LC50=0.65 mg.L‐1), showing a high bioconcentration ability (BCF>1) during the exposure. The intracellular partitioning data showed that most Pb was accumulated in the insoluble fraction (>80%). Several significant biochemical changes were observed, namely on catalase and glutathione‐S‐tranferase activities and metalothionein content. Overall, it was demonstrated that the European clam has a reduced tolerance to Pb, when compared to other bivalves. However, consumption of clams from the Ria de Aveiro lagoon (Portugal) does not raise public health concerns, in terms of Pb. Environ Toxicol Chem © 2014 SETAC

Customer comments

No comments were found for Venerupis decussata under environmentally relevant lead concentrations: Bioconcentration, tolerance and biochemical alterations. Be the first to comment!