Bioaccumulation of trace metals in the calanoid copepod Metridia gerlachei from the Weddell Sea (Antarctica)

Bioaccumulation of Cd, Co, Cu, Ni, Pb and Zn in the Antarctic calanoid copepod Metridia gerlachei (Giesbrecht 1902) was investigated during a cruise of RV ‘Polarstern’ to the Weddell Sea, primarily to provide information on accumulation strategies for the metals tested. With the sole exception of Cd, the copepod accumulated metals during exposure and depurated them in uncontaminated seawater. The process of uptake and depuration was successfully described by a hyperbolic model, leading to significant estimations of the following experimental bioconcentration factors (BCFs): 210 (Co), 3430 (Cu), 3060 (Ni), 670 (Pb) and 2090 (Zn). Furthermore, we provide an approach to evaluate the sensitivity of Metridia gerlachei as a biomonitor of water-borne metals in the field; the results indicate minimal increments in ambient exposure concentrations of: 0.5 μg Cu l−1, 0.8 μg Ni l−1, 0.6 μg Pb l−1 and 0.2 μg Zn l−1, suggesting a high sensitivity of M. gerlachei for biomonitoring.