PMID: 8599033Jan 1, 1995Paper

Ecotoxicology of chlorpyrifos

Reviews of Environmental Contamination and Toxicology
Mace G Barron, K B Woodburn

Abstract

Chlorpyrifos is a broad-spectrum organophosphorothioate insecticide with a principal mechanism of toxicity by inactivation of acetylcholinesterase at nerve junctions. Unlike certain organochlorine pesticides, chlorpyrifos is relatively nonpersistent (Racke 1993), and its principal degradation products are less toxic than the parent chemical. Species sensitivity varies considerably across kingdom and phyla. In general, aquatic and terrestrial microorganisms and plants are tolerant to chlorpyrifos exposure. Aquatic invertebrates, particularly crustaceans and insect larvae, are sensitive to exposure: LC50s are generally less than 1 microgram/L, and no-observed-effect concentrations may be below 0.1 microgram/L in laboratory studies. Fish appear to be less sensitive, with LC50s generally between 1 and 100 micrograms/L and no-observed effect concentrations of approximately 0.5 microgram/L. In general, saltwater and freshwater organisms exhibit similar sensitivity to chlorpyrifos, considering the extreme phylogenetic and species differences in toxicity. Chlorpyrifos effects in aquatic ecosystems are complex because of the diversity of species assemblages and trophic interactions. In general, functional endpoints (e.g., community meta...Continue Reading

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