DDT and hexachlorobenzene residues in southeastern Washington Swainson's hawks (Buteo swainsoni)
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The U.S. Fish and Wildlife Service (FWS) has supported research on control methods for nuisance birds, mammals, plants, and fish. Although chemical agents have shown great promise, resource managers and regulatory agencies must be assured that these materials are safe to man and the environment. Standardized toxicity tests are conducted to demonstrate the effectiveness of candidate compounds on target organisms and their safety to nontarget organisms (LENNON 1967).
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This paper reports organochlorine (OCL) concentrations in breeding female tree swallows, nestlings, and eggs, and measurements of egg size and eggshell thickness. Our objective was to determine if higher concentrations of OCL chemicals were associated with adult mortality or nesting failure.
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Mallard drakes accumulated mercury rapidly from dietary dosage of methylmercury dicyandiamide and eliminated it slowly, retaining approximately one half at the end of 84 days; no measurable loss occurred between the end of the 7th and 56th days, but loss resumed concurrently with new feather growth, and continued through the 112th day, the close of the study.
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