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Watershed- and Regional Scale Contamination

USGS scientist collecting sand crabs from an estuary near Richmond, Calif.
USGS scientist collecting sand crabs for analysis from an urban estuary near Richmond, California. Crabs utilize these rocky intertidal areas as breeding grounds. Scientists detected pyrethroid insecticides as well as 21 other pesticides, including DDT, in crab embryos -- from the Pesticide Contamination in Varied Pesticide-Use Settings Investigation


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