Current impact of DDE on black-crowned night-herons in the intermountain west
Journal of Wildlife Management
By: C. J. Henny, L. J. Blus, A. J. Krynitsky, and C. M. Bunck
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Abstract
Organochlorine contamination was studied in 8 black-crowned night heron (N. nycticorax) populations nesting in Washington, Oregon and Nevada [USA] in 1978-1980. DDE was detected in 220 eggs sampled; eggshell thickness was negatively correlated with residues of DDE and polychlorinated biphenyls (PCB). Other contaminants were detected in .ltoreq. 35% of the eggs. Except for the 2 Columbia River colonies in which local DDE contamination was a probable compounding factor, a strong north-south clinal pattern of DDE residues among colonies existed. Southern colonies were most contaminated, and productivity was below population maintenance in 1 colony (Ruby Lake). At DDE levels in eggs > 8 ppm, clutch size and productivity decreased, and the incidence of cracked eggs increased. No evidence of breeding-ground DDE-DDT contamination was found except along the Columbia River.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Current impact of DDE on black-crowned night-herons in the intermountain west |
| Series title | Journal of Wildlife Management |
| Volume | 48 |
| Issue | 1 |
| Year Published | 1984 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 1-13 |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Wildlife Management |
| First page | 1 |
| Last page | 13 |
| Google Analytic Metrics | Metrics page |