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nationwide residues of organochlorine compounds in wings of adult mallards and black ducks, 1979-80.organochlorine residues in wings of adult mallards (anas platyrhynchos) and black ducks (anas rubripes) were monitored nationwide from birds harvested during the 1979-80 hunting season. dde residues were found in all samples. ddt residues had declined from levels reported in 1976 on a flyway basis but the decline was significant (p less than 0.05) only in the pacific flyway. levels of ddt, dde, tde, and dieldrin were low on a flyway basis, and all but dde declined significantly (p less than 0.05 ...19816817294
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