Cu, Fe, Cr. Cd, Mn and Zn concentrations were determined in different organs of the Antarctic scallop Adarnussium colbecki (Smith) and compared with those found in Pecten jacobaeus L., a scallop of temperate waters, and wlth literature values for other Pectinidae. The digestive gland of A. colbeck, was the target organ for Cu, Fe, Cr and Cd, whereas Mn and Zn were found mainly in the kidney. Cd concentration in the digestive gland of A. colbecki was higher than that in the same organ of P. jacobaeus, indicating a marked ability of the Antarctic scallop to concentrate this metal. However, in A. colbecki renal concentrations of both Mn and Zn were considerably lower than those measured in P. lacobaeus and other Pectinidae, and may be related to the scarcity of concretions observed in its kidney.
Accumulation of heavy metals (Cu, Cd and Mn) and their effects on total Ca content were studied under laboratory conditions in sandy-bottom bivalves Donacilla cornea from a n unpolluted shore in northern Sardinia. The bivalves were found to accumulate the 3 metals. Exposure at 2 different temperatures (18 and 25°C) showed significant differences only for Cu accumulation. Following decontamination in clean seawater, the body content of Cu and Mn decreased strongly, whereas that of Cd remained practically unchanged. Among organs, gills contained the highest metal concentrations. A net increase of total Ca concentration in the body was observed during metal accumulation, and the digestive gland seems the most suitable organ for studies on the effects of heavy metals on calcium homeostasis.
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