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Eggshell thinning and contaminant levels in bald eagle eggs from Arizona, 1977 to 1985

Southwestern Naturalist

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Abstract

The mean eggshell thickness of 11 eggs of bald eagles (Haliaeetus leuccocephalus) and 21 samples of eggshell fragments (n = 32) collected from 14 nests in Arizona during 1977 to 1985 was 0.539 mm, 8.8% thinner than the pre-1947 (pre-DDT) mean for eggs from southern California and Baja California, Mexico. Eleven eggs analyzed for contaminants contained slightly elevated concentrations of DDE (3.3pmm wet weight) and mercury (0.14 ppm). Productivity of sampled pairs was low but improving. The predictive equations of Wiemeyer et al. (1984) were also verified.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Eggshell thinning and contaminant levels in bald eagle eggs from Arizona, 1977 to 1985
Series title:
Southwestern Naturalist
Volume
35
Issue:
3
Year Published:
1990
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
298-301
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Southwestern Naturalist
First page:
298
Last page:
301