Stream microcosm toxicity tests: Predicting the effects of fenvalerate on riffle insect communities
Aquatic insects, Fenvalerate, Stream microcosms, Toxicity
Environmental Toxicology and Chemistry
Stream microcosms were used to predict toxicity of the pyrethroid insecticide fenvalerate to riffle insect assemblages. Over a 30‐d test period, stream microcosms were exposed in triplicate to 0.0, 0.01, 0.1, 1.0, or 10.0 μg/L fenvalerate. Effects were determined by statistically comparing insect abundances over all concentrations. Initial exposure resulted in a significant increase in drift in the 1.0‐ and 10.0‐μg/L treatments. After 30 d, several taxa exhibited density reductions at 0.01 μg/L, but this reduction was significant for only one taxon. Densities of most other taxa decreased significantly at 0.1 μ/L. Significant reductions in species richness and total density also were observed at 0.1 μg/L fenvalerate. Overall, the results suggest that at environmental concentrations of 0.1 μg/L, mayflies and stoneflies would be eliminated and riffle beetles, caddisflies, and some chironomids would be present in significantly reduced numbers. Copyright © 1994 SETAC
Original Publication Date
DOI of published version
Breneman, Dan H. and Pontasch, Kurt W., "Stream microcosm toxicity tests: Predicting the effects of fenvalerate on riffle insect communities" (1994). Faculty Publications. 4369.