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Science 29 November 1974:
Vol. 186. no. 4166, pp. 841 - 842
DOI: 10.1126/science.186.4166.841
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Articles

Decline of DDT Residues in Migratory Songbirds

David W. Johnston 1

1 Department of Zoology, University of Florida, Gainesville 32611

Analyses of ten species of migratory songbirds killed when the birds flew into television towers in Florida showed a progressive decline in the concentration of DDT and its metabolites (DDD and DDE) in their fat depots for the period 1964 to 1973. This decline is apparently correlated with the decreased usage of DDT in the United States during the same time.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)