Trace metals in the Antarctic soft-shelled clam Laternula elliptica: implications for metal pollution from Antarctic research stations

The concentrations of Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn were measured in se veral soft-tissue types of the Antarctic soft-shelled clam, Laternula ellip tica, which had been collected from Rothera Research Station, Adelaide Isla nd, Antarctic Peninsula. Concentrations of Mn, Ni, Cr and Pb were significa ntly higher in the kidney than in any other soft tissue and highest concent rations of Cu were observed in the digestive gland. In general, the total t issue concentrations of heavy metals in L. elliptica were considered to be at baseline levels, except for Cu in organisms near the end of the runway. Copper concentrations were an order of magnitude greater (357 mug/g dry wei ght) than baseline levels, suggesting anthropogenic contamination or an uni dentified natural source. However, there was no indication of anthropogenic metal contamination occurring close to the sewage outfall at Rothera, whic h is a significant metal source. The results indicate that L. elliptica is a useful long-term biomonitor of heavy metal contamination in Antarctic coa stal waters.