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USGS · 5221619

Dieldrin and heptachlor residues in dead gray bats, Franklin County, Missouri--1976 versus 1977

D. R. Clark·R. K. LaVal·A. J. Krynitsky
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Abstract

Lethal dieldrin concentrations were found in the brains of dead gray bats ( Myotis grisescens ) collected during 1976 and 1977 beneath a maternity roost in a Missouri cave. In addition, residues of heptachlor epoxide, oxychlordane, cis-chlordane, and trans-nonachlor increased significantly in both brains and carcasses of bats collected during 1977. These increases appear to reflect a switch by local farmers from aldrin, dieldrin's parent compound, to heptachlor for the control of cutworms. They also constitute an additional threat to this colony of this endangered bat species.

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D. R. Clark, R. K. LaVal, A. J. Krynitsky. 1980. Dieldrin and heptachlor residues in dead gray bats, Franklin County, Missouri--1976 versus 1977. https://pubs.usgs.gov/publication/5221619

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