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Organochlorine residues and shell thinning in Oregon seabird eggs

Murrelet

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Abstract

A single egg was collected at 62 nests of 10 seabird species from Oregon in 1979. The eggs were analyzed for organochlorine contaminants; contemporary shell thickness was compared with eggshells collected during earlier time periods. Concentrations of DDE and PCB's in 1979 were generally low with the most contaminated species being the Double-crested Cormorant (Phalacrocorax auritus), Leach's Storm Petrel (Oceanodroma leucorhoa), and Forktailed Storm Petrel (O. furcata). Limited eggshell data provide evidence that shell thinning was more severe along the Oregon coast in the 1950's than in 1979. With the possible exception of the Fork-tailed Storm Petrel, the residues in 1979 posed no known threat to the welfare of the species.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Organochlorine residues and shell thinning in Oregon seabird eggs
Series title:
Murrelet
Volume
63
Issue:
1
Year Published:
1982
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
15-21
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Murrelet
First page:
15
Last page:
21