Abstract
The geographical variation of cadmium in natural populations of the amphipod Gammarus tigrinus Sexton was investigated during two periods. Cd concentrations varied between 0·232 ± 0·038 ppm and 1·47 ± 0·24 ppm (95% CI, dry weight) which was within the range reported in the literature for several species of small crustaceans from freshwater and marine environments. The relationships between Cd in amphipods and in sediments were investigated considering HCl extracts (0·3 mol litre −1) of the total sediment and the silt fraction (≤63 μm). The data only supported the hypothesis of a relationship with regard to the total sediment and indicated higher Cd levels in amphipods and sediments from the river Werra compared eith the river Weser. From the sediments no additional Cd was extracted with concentrated HNO 3 (about 14·5 mol litre −1), indicating that Cd was predominant in a mobile state.
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