Abstract
Abstract 1. Acute and chronic toxicity tests with endosulfan were conducted on Daphnia magna . The 24-hr static lc 50 was 0.62 mg/l with a coefficient of variation of 14.2%. 2. The sublethal effects of 0.12, 0.15, 0.20, 0.25 and 0.31 mg/l endosulfan on the survival, reproduction and growth of D. magna were monitored for 21 days. 3. The parameters used to determined the effect of the pesticide on reproduction were: mean total young per female, maximum number of broods, mean brood size, mean number of broods, mean time to first reproduction and intrinsic rate of natural increase ( r ). 4. Growth, as measured by body length, was depressed significantly at all endosulfan concentrations tested. The highest concentrations used (0.20, 0.25 and 0.31 mg/l) caused a decrease in survival and mean total young per female, and an increase in the time to first reproduction. The intrinsic rate of natural increase ( r ) and the mean number of broods were decreased significantly at all the sublethal concentrations of endosulfan tested.
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