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Reproduction and Organochlorine Contaminants in Terns at San Diego Bay

Harry M. Ohlendorf, Fred C. Schaffner, Thomas W. Custer and Charles J. Stafford
Colonial Waterbirds
Vol. 8, No. 1 (1985), pp. 42-53
Published by: Waterbird Society
DOI: 10.2307/1521193
Stable URL: http://www.jstor.org/stable/1521193
Page Count: 12
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Reproduction and Organochlorine Contaminants in Terns at San Diego Bay
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Abstract

In 1981, we studied Caspian Terns (Sterna caspia) and Elegant Terns (S. elegans) nesting at the south end of San Diego Bay, California. Randomly collected Caspian Tern eggs contained significantly (P<0.05) higher mean concentrations of DDE (9.30 ppm) than did Elegant Tern eggs (3.79 ppm). DDE may have had an adverse effect on Caspian Tern reproduction but the relationship between hatching success and DDE concentration was not clear. We found an unusually high incidence of chicks (4.6%) that died in hatching. Caspian Tern eggs that broke during incubation or contained chicks that died while hatching had shells that were significantly (P<0.05) thinner than eggs collected before 1947, and DDE was associated with reductions in shell thickness index (i.e., lowered eggshell density). Fish brought to Caspian Tern chicks contained up to 3.0 ppm DDE and 1.1 ppm PCBs. Organochlorine concentrations in brains of terns found dead were not high enough to suggest such poisoning as a cause of death.

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