| 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. |
| Genre: | Book chapter |
| ProdID: | 5211025 |
| Citation Author: | Custer, T.W.; Custer, C.M.; Stromborg, K.L.; Melancon, M.J. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation Editor: | Adams, N.J.; Slotow, R.H. (editors) |
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| Citation Language: | English |
| Citation Larger Work Title: | Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban. |
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| Citation Phsyical Description: | on CD-ROM: lxxxi, 3229 |
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| Citation Public Comments: | Title on liner notes: Making rain for African ornithology. Within contents, click on Posters, then Programme for Poster J section: Conservation and human-related topics |
| Citation Publisher: | Bird Life South Africa |
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| Citation Search Results Text: | Effects of contaminants on Double-crested Cormorant reproduction in Green Bay, Wisconsin, USA; 1999; Book chapter; Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban.; Custer, T.W.; Custer, C.M.; Stromborg, K.L.; Melancon, M.J. |
| Citation Start Page: | J022 (abst |
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| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Effects of contaminants on Double-crested Cormorant reproduction in Green Bay, Wisconsin, USA; 1999; Book chapter; Proceedings 22nd International Ornithological Congress, 16-22 August 1998, Durban.; Custer, T.W.; Custer, C.M.; Stromborg, K.L.; Melancon, M.J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 9 Jun 2009 09:23 -0500 |
| Publisher: | Bird Life South Africa |
