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Organochlorines and selenium in California night-heron and egret eggs

Environmental Monitoring and Assessment

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Abstract

Exceptionally high concentrations of DDE were found in black-crowned night-heron (Nycticorax nycticorax) (geometric mean 8.62 mu-g g-1 wet wt.) and great egret (Casmerodius albus) (24.0 mu-g g-1) eggs collected from the Imperial Valley (Salton Sea), California in 1985. DDE concentrations in 14 of the 87 (16%) randomly selected night-heron eggs from six colonies (two in San Francisco Bay, three in the San Joaquin Valley, and one at Salton Sea) were higher than those associated with reduced reproductive success of night-herons (8 mu-g/g-1). In addition, mean shell thickness of night- heron eggs collected from the San Joaquin Valley and from San Francisco Bay during 1982-1984 was significantly less than pre-DDT thickness and was negatively correlated (r = 0.50, n = 75, P lt 0.0001) with DDE concentration. Mean selenium concentration in night-heron eggs from Salton Sea (1.10 mu-g g-1) was significantly higher than in eggs from three locations in the San Joaquin Valley, and in egret eggs from Salton Sea.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Organochlorines and selenium in California night-heron and egret eggs
Series title:
Environmental Monitoring and Assessment
Volume
15
Issue:
1
Year Published:
1990
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
91-104
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Monitoring and Assessment
First page:
91
Last page:
104
Number of Pages:
14