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Population ecology of the great blue heron with special reference to western Oregon

Canadian Field-Naturalist

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Abstract

Great Blue Heron (Ardea herodias) begin nesting in western Oregon about 1 month earlier than reported from the Philadelphia region and about 2 months earlier than reported from Southern Alberta. The number of young fledged per nesting pair in Oregon was 2.04 in 1970 which was nearly identical to the 1.91 believed necessary to maintain a stable population in the northern United States. The level of p,p'DDE reported from two eggs in Oregon was within the same range as that reported from 40 eggs in Alberta. Although some thin-shelled eggs were being laid in Alberta, the observed production was believed sufficient for maintaining a stable population. Production rates reported from a heronry in central California suggested that the population there was also remaining fairly stable.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Population ecology of the great blue heron with special reference to western Oregon
Series title:
Canadian Field-Naturalist
Volume
85
Issue:
3
Year Published:
1971
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
205-209
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Canadian Field-Naturalist
First page:
205
Last page:
209