Abstract
The concentrations of cadmium in 428 samples of the sea-skater Halobates micans from 57 locations in the central and south Atlantic Ocean ranged from 1.7 to 122 μg Cd g-1 dry wt. The concentrations in females, males and nymphs were not significantly different. The data suggest that the cadmium concentrations in these insects are somehow related to surface currents. The highest values (50 to 70 μg g-1, maximum value 122 μg g-1) were recorded from the South Equatorial Current region; intermediate values (10 to 20 μg g-1) from the Equatorial Counter Current and the North Equatorial Current; and relatively low concentrations (>10 μg g-1) from the Canary Current in the north and the Benguela Current in the south. A remarkable feature of these data lies in the fact that they reveal areas of high Cd content which correspond closely with those indicated by data obtained by Bull et al. (1977) from a different set of samples, analyzed by different methods and obtained in different years.
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