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DDE Decreases in Plasma of Spring Migrant Peregrine Falcons, 1978-94

Charles J. Henny, William S. Seegar and Thomas L. Maechtle
The Journal of Wildlife Management
Vol. 60, No. 2 (Apr., 1996), pp. 342-349
Published by: Wiley on behalf of the Wildlife Society
DOI: 10.2307/3802233
Stable URL: http://www.jstor.org/stable/3802233
Page Count: 8
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DDE Decreases in Plasma of Spring Migrant Peregrine Falcons, 1978-94
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Abstract

Mean p,p'-DDE (DDE) residues in plasma of combined adult and subadult female peregrine falcons (Falco peregrinus) decreased significantly in spring migrants captured at Padre Island, Texas, between 1978 and 1979 (1.00 μg/g wet wt), 1980 (0.57), 1984 (0.50), and 1994 (0.34). No other organochlorine pesticides were detected (detection limit, 0.02 μg/g) in 1994. Mirex, oxychlordane, dieldrin, heptachlor epoxide, and the parent material DDT were routinely found in plasma samples in earlier years. Polychlorinated biphenyls (PCBs) were found in 75% of the adult females in 1994, but PCB data collected in 1984 were not comparable. The decrease in organochlorine pesticide residues was associated with peregrine population increases in the Arctic and elsewhere in North America. The arctic peregrine (F. p. tundrius) was removed from the list of Threatened and Endangered Species by the U.S. Fish and Wildlife Service in 1994. Satellite telemetry and plasma sampling provide new insight into continuing sources of DDE and PCBs. Chemicals that replaced organochlorine pesticides require additional investigation in North and South America.

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