The Role of Sediment as a Modifying Factor in Pesticide-Algae Interactions12

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Abstract
The influence of pesticide-sediment associations on pesticide-algae interactions was investigated by examining the inhibitory effects of 3 pesticides on algal photosynthesis in one compartment (axenic Euglena gracilis culture) and 2 compartment (alga plus sediment) systems. Carbon-14 incorporation was used as an indication of photosynthetic activity. A 24-h exposure to either DDT or carbaryl significantly inhibited photosynthesis in E. gracilis at concentrations of 10 ppb or greater. Abate® [O,O'-(thiodi-p-phenylene) O,O,O',O'-tetramethyl phosphorothioate] was only marginally inhibitory at concentrations up to 100 ppb. The presence of sediment was highly significant in reducing the inhibition for all 3 insecticides. This effect of increasing test system complexity is important in extrapolating results of simple laboratory experiments to field conditions.

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