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Brown pelican populations and pollutants in Texas 1975-1981

Wilson Bulletin

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Abstract

The population status, reproductive success, and levels of environmental contaminants in brown pelicans (P. occidentalis) in Texas were studied from 1975 through 1981. Breeding populations increased from 18 pairs in 1975 to 57 pairs in 1981. All unhatched eggs salvaged for analyses of contaminant residues contained DDT metabolites. Mean DDE levels varied from 0.9 to 2.4 ppm and about 7% of the samples had residues that approached critical levels that could affect reproductive success. DDE levels did not decline from 1975 to 1981 and residues leveled off at higher values than those in South Carolina and Louisiana pelican populations. PCB [polychlorinated biphenyl] residues also remained stable. Endrin was detected only in 1975.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Brown pelican populations and pollutants in Texas 1975-1981
Series title:
Wilson Bulletin
Volume
97
Issue:
2
Year Published:
1985
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
201-214
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wilson Bulletin
First page:
201
Last page:
214
Number of Pages:
14