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Nesting biology of laughing gulls in relation to agricultural chemicals in south Texas, 1978-81

Wilson Bulletin

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Abstract

Laughing Gulls (Larus atricilla) were studied along the south Texas coast during 1978-1981 to determine productivity and to evaluate the effects of environmental pollutants on reproduction. The average clutch-size was 2.6, ranging from 2.3-2.8. Sixty-six percent of the eggs hatched and 82% of the pairs hatched at least one egg. Productivity (fledglings/total nests) averaged 1.0 fledgling per nest. DDE and other organochlorine residues were low in eggs (usually <3 ppm wet weight) and were not suspected of causing reproductive problems. However, organophosphate pesticides sprayed on crops near the study areas reduced productivity by as much as 33% during 3 of 4 years, implying that certain of these chemicals may pose serious threats to the population.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Nesting biology of laughing gulls in relation to agricultural chemicals in south Texas, 1978-81
Series title:
Wilson Bulletin
Volume
95
Issue:
4
Year Published:
1983
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
540-551
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Wilson Bulletin
First page:
540
Last page:
551
Number of Pages:
12