ABSTRACT
The emphasis is on studies that investigated pesticides in bed sediment or aquatic biota in rivers and streams in the United States. National and multistate monitoring studies are occurrence surveys for one or more classes of pesticides at several sites in multiple states. State and local monitoring studies are occurrence and distribution surveys for specific compounds or compound classes, usually at multiple sites within a specific area. They include publications from statewide monitoring programs, one-time reconnaissance surveys for specific areas or basins, and longer-term monitoring efforts at a limited number of sites. Of aquatic biota investigated, more studies of all three types measured residues in fish than in other aquatic organisms. Other invertebrates and mollusks placed a distant second and third, respectively, in state and local monitoring studies and in process studies. During the 1980s, the study effort increased overall, with the relative proportion devoted to pesticides other than organochlorine insecticides remaining about the same as during the 1970s.
