Abstract
The mussel Mytilus galloproaincialis was used as a bioindicator species in a lead-polluted area of the North Tyrrhenian Sea. A pronounced seasonality was observed in Pb concentration within the digestive gland, whereas the total Pb content of the organ appeared less variable. This difference is mainly due to the influence of gonadal development on digestive gland weight. Control mussels transplanted for 6 months into the polluted area showed a strong increase of Pb, which reached a steady state after 4 weeks. Subcellular responses were investigated in mussels sampled from the polluted environment. A severe disturbance of the lysosomal system was demonstrated, indicating the utility of stress indices based on the responses of these organelles to pollutants. Our results are discussed in terms of their implications for biomonitoring programs.
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