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Heavy metal concentrations and biomarkers of oxidative stress in native mussels (Mytilus edulis chilensis) from Beagle Channel coast (Tierra del Fuego, Argentina)
Authors:Duarte Claudia A  Giarratano Erica  Amin Oscar A  Comoglio Laura I
Institution:a Centro Austral de Investigaciones Científicas (CADIC - CONICET), Av. B. Houssay 200 (V9410BFD) Ushuaia, Tierra del Fuego, Argentina
b Centro Nacional Patagónico (CENPAT - CONICET), Blvd. Brown 2915, (9120) Puerto Madryn, Chubut, Argentina
Abstract:The aim of this study was to evaluate the usefulness of oxidative stress biomarkers of pollution in native mussels Mytilus edulis chilensis from the Beagle Channel. Spatial and seasonal variations of catalase, glutathione-S-transferase and lipid peroxidation in gills and digestive gland were analyzed in relation to environmental parameters, heavy metals in sediment and in tissue. Four sites with anthropogenic impact and a control site were selected and monitored during the four seasons of 2007. We found significant differences among sites in concentrations of dissolved nutrients and heavy metals in sediments, with the highest values recorded at sites with anthropogenic pressure. Different patterns were observed between concentrations of metals in tissues and in sediments suggesting differences in bioavailability. There were also significant differences in biomarker responses among sites, despite the strong seasonal variability. Our results showed relatively moderate levels of pollution in the study area as a result of urban influences.
Keywords:Mussels  Heavy metals  Beagle Channel  Oxidative stress biomarkers
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