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Residues of DDT and its metabolites (Z:DDT) in blood plasma from Bald Eagles (Haliaeetus leucocephalus) wintering in Colorado and Missouri were low (0.06-0.14 ?g/g) in 1977 and 1978. Most of the adult wintering birds probably nest in Canada, although a few in Missouri may be from Minnesota or the Great Lakes region. DDE residues in eggs, estimated from those in plasma, were lower than those reported from Saskatchewan in 1969-1972 (4.5 ?g/g vs. 0.67 ?g//g); this suggests reduced environmental contamination.
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Low DDT residues in plasma of bald eagles (Haliaeetus leucocephalus) wintering in Colorado and Missouri