Abstract
This article discusses pesticide residues in the sediments of the Lower Mississippi River Alluvial Plain of Arkansas and Mississippi related to bioaccumumulation by the freshwater crustacean Hyalella azteca. According to the authors, most of these pesticides are the result of agricultural runoff and consist of both current use and legacy or discontinued pesticides. Three types of watersheds were investigated including National Wildlife Refuge, Best Management Practices (BMPs) and watersheds where the total maximum daily load of legacy pesticides exceeded guidelines. They concluded that BMPs have little if any impact on pesticide sequestration and few available current-use insecticides but greater legacy compounds accumulated in H. azteca tissues
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