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Organochlorine Contaminants in White-Faced Ibis Eggs in Southern Texas

Thomas W. Custer and Christine A. Mitchell
Colonial Waterbirds
Vol. 12, No. 1 (1989), pp. 126-129
Published by: Waterbird Society
DOI: 10.2307/1521325
Stable URL: http://www.jstor.org/stable/1521325
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Organochlorine Contaminants in White-Faced Ibis Eggs in Southern Texas
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Abstract

White-faced Ibis (Plegadis chihi) eggs collected from two colonies in southern Texas in 1985 had low mean concentrations of DDE (0.14-0.27 ppm wet weight). DDD, the only other organochlorine contaminant detected, was found in only 1 of 20 eggs. DDE concentrations in eggs were not significantly correlated with eggshell thickness. Mean DDE concentrations were significantly higher in eggs collected from nests where not all of the remaining eggs hatched (1.0 ppm) than in eggs collected from nests where all the remaining eggs hatched (0.15 ppm).

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