title: Dieldrin and heptachlor residues in dead gray bats, Franklin County, Missouri--1976 versus 1977.
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.
mesh_terms: D000818:Animals; D001717:Birds / Q000378:metabolism; D001923:Brain Chemistry; D002685:Chiroptera / Q000378:metabolism*; D004026:Dieldrin / Q000032:analysis*; D006533:Heptachlor / Q000032:analysis*; D008055:Lipids / Q000032:analysis; D008923:Missouri; D010573:Pesticide Residues / Q000032:analysis*; D013997:Time Factors
chemical_list: D008055:Lipids; D010573:Pesticide Residues; D006533:Heptachlor; D004026:Dieldrin