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TOXICITY OF SYNTHETIC PYRETHROIDS TO FRESHWATER INVERTEBRATES
Citation:
Anderson, R. TOXICITY OF SYNTHETIC PYRETHROIDS TO FRESHWATER INVERTEBRATES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/033 (NTIS PB90100645), 1989.
Description:
This report reviews the laboratory toxicity data on freshwater target and nontarget invertebrate s exposed to pyrethroids and evaluates the state of the data. Early in their development, yrethroids were shown to be highly effective insecticides gainst mosquitoes, blackflies and cltironomids. Acute LG50 values for these target animals were often less than 1 ug/L. Acute exposures of nontarget invertebrate s showed that some species were as sensitive as the target insects. Longer exposures, up to 28 d, showed that lethal effect concentrations were lowered with increased exposure duration. Unfortunately, the long exposure ests were limited to a few species and a few pyrethroids, so no general commentary on no effect concentrations is possible. Some species were affected at concentrations near the analytical detection limit for pyrethroids. he data reviewed show that temperature, life cycle stage and exposure duration will be critical factors in developing the no effect concentrations that are important in risk assessments for nontarget invertebrates exposed to these insecticides.