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Current impact of DDE on black-crowned night-herons in the intermountain west

Journal of Wildlife Management

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Abstract

Organochlorine contamination was studied in 8 black-crowned night heron (N. nycticorax) populations nesting in Washington, Oregon and Nevada [USA] in 1978-1980. DDE was detected in 220 eggs sampled; eggshell thickness was negatively correlated with residues of DDE and polychlorinated biphenyls (PCB). Other contaminants were detected in .ltoreq. 35% of the eggs. Except for the 2 Columbia River colonies in which local DDE contamination was a probable compounding factor, a strong north-south clinal pattern of DDE residues among colonies existed. Southern colonies were most contaminated, and productivity was below population maintenance in 1 colony (Ruby Lake). At DDE levels in eggs > 8 ppm, clutch size and productivity decreased, and the incidence of cracked eggs increased. No evidence of breeding-ground DDE-DDT contamination was found except along the Columbia River.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Current impact of DDE on black-crowned night-herons in the intermountain west
Series title:
Journal of Wildlife Management
Volume
48
Issue:
1
Year Published:
1984
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
1-13
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Management
First page:
1
Last page:
13
Number of Pages:
13