Dieldrin and DDT: Effects on Sparrow Hawk Eggshells and Reproduction

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Science  11 Jul 1969:
Vol. 165, Issue 3889, pp. 199-200
DOI: 10.1126/science.165.3889.199


Patterns of reproductive failure in declining populations of several European and North American raptorial species were duplicated experimentally with captive American sparrow hawks Falco sparvcrius that were given a diet containing two commonly used organochlorine insecticides. Major effects on reproduction were increased egg disappearance, increased egg destruction by parent birds, and reduced eggshell thickness.

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