Assessing the risk to green sturgeon from application of imidacloprid to control burrowing shrimp in Willapa Bay, Washington--Part II: controlled exposure studies

Environmental Toxicology and Chemistry
John A Frew, C E Grue

Abstract

The activities of 2 species of burrowing shrimp have a negative impact on the growth and survival of oysters reared on intertidal mudflats in Willapa Bay and Grays Harbor, Washington (USA). To maintain viable harvests, oyster growers proposed the application of the neonicotinoid insecticide imidacloprid onto harvested beds for the control of burrowing shrimp. In test applications, water column concentrations of imidacloprid were relatively low and dissipated rapidly. The foraging activities of the green sturgeon (listed in the US Endangered Species Act) could result in exposure to higher, more sustained imidacloprid concentrations within sediment porewater and from the consumption of contaminated shrimp. Controlled experiments were conducted using surrogate white sturgeon to determine acute and chronic effect concentrations, to examine overt effects at more environmentally realistic concentrations and durations of exposure, and to assess chemical depuration. The 96-h median lethal concentration was 124 mg L(-1) , and the predicted 35-d no-observed-adverse-effect concentration was 0.7 mg L(-1) . No overt effects were observed following environmentally relevant exposures. Imidacloprid half-life in plasma was greater than 32 h. Me...Continue Reading

References

Oct 1, 1988·BMJ : British Medical Journal·W R Engel, A Grau
Jul 11, 2002·Journal of Agricultural and Food Chemistry·Allan S Felsot, Judy R Ruppert
Sep 5, 2002·Annual Review of Entomology·Motohiro Tomizawa, John E Casida
Jun 23, 2010·Journal of Agricultural and Food Chemistry·Peter JeschkeAlfred Elbert

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