Organochlorine and mercury residues in Swainson's and ferruginous hawk eggs collected in North and South Dakota, 1974–79 |
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Authors: | Rey C. Stendell David S. Gilmer Nancy A. Coon Douglas M. Swineford |
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Affiliation: | (1) Northern Prairie Wildlife Research Center, U.S. Fish and Wildlife Service, 58402 Jamestown, ND, USA;(2) Patuxent Wildlife Research Center, U.S. Fish and Wildlife Service, 20708 Laurel, MD, USA |
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Abstract: | Residues of organochlorine pesticides, polychlorinated biphenyls (PCBs), and mercury were measured in eggs of Swainson's hawks (Buteo swainsoni) and ferruginous hawks (B. regalis) collected in North and South Dakota during 1974–79. DDE was the most common compound detected in the eggs, but residues were below levels known to have adverse effects on reproduction. Other organochlorine compounds and mercury were found at low levels. Eggs of ferruginous hawks tended to contain more compounds with higher residues than eggs of Swainson's hawks. |
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