Population ecology of the great blue heron with special reference to western Oregon
Canadian Field-Naturalist
By: Charles J. Henny and M.R. Bethers
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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.
Suggested Citation
Henny, C.J., and Bethers, M., 1971, Population ecology of the great blue heron with special reference to western Oregon: Canadian Field-Naturalist, v. 85, no. 3, p. 205-209.
| 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 |
| Publisher | Ottawa Field-Naturalists' Club |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 5 p. |
| First page | 205 |
| Last page | 209 |