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Abstract
In 1994 and 1995, Double-crested Cormorants Phalacrocorax auritus were monitored from egg-laying through 12 days of age at Cat Island, Green Bay, Wisconsin, USA. Sample eggs at hatching were analysed for organochlorines (including total PCBs, PCB congeners, and DDE), hepatic microsomal ethoxyresorufin-O-dealkylase (EROD) activity in livers of embryos, and eggshell thickness. The number of eggs per nest that hatched and survived to i 2 days of age was estimated to be 2.2 in 1994 and 2.0 in 1995. Hatching success of eggs was not correlated with PCBs, the toxicity of PCBs based on congeners, or EROD activity. Hatching success was correlated with eggshell thickness and negatively correlated with DDE concentrations. Even though the insecticide DDT was banned in the early 1970s, we suggest that DDE concentrations in cormorant eggs in Green Bay are still having an affect on reproduction in this species.
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Effects of contaminants on Double-crested Cormorant reproduction in Green Bay, Wisconsin, USA |
| Year Published | 1998 |
| Language | English |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Larger Work Type | Book |
| Larger Work Subtype | Other Government Series |
| Larger Work Title | Proceedings of the 22nd International Ornithological Congress, Durban 16-22 August 1998, Abstracts of oral presentations and posters |
| First page | 424 (abstr |
| Google Analytic Metrics | Metrics page |