Organochlorine contaminants and reproductive success of double-crested cormorants from Green Bay, Wisconsin, USA
Autor: | P. David Allen, Randy K. Hines, Steve Gutreuter, Mark J. Melancon, Thomas W. Custer, Christine M. Custer, Kenneth L. Stromborg |
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Rok vydání: | 1999 |
Předmět: |
animal structures
Reproductive success Ecology Hatching Health Toxicology and Mutagenesis media_common.quotation_subject food and beverages Cormorant Biology Pesticide Dieldrin chemistry.chemical_compound Animal science chemistry biology.animal embryonic structures Environmental Chemistry Reproduction Eggshell Bay reproductive and urinary physiology media_common |
Zdroj: | Environmental Toxicology and Chemistry. 18:1209-1217 |
ISSN: | 1552-8618 0730-7268 |
DOI: | 10.1002/etc.5620180620 |
Popis: | In 1994 and 1995, nesting success of double-crested cormorants (Phalacrocorax auritus) was measured at Cat Island, in southern Green Bay, Lake Michigan, Wisconsin, USA. Sample eggs at pipping and unhatched eggs were collected and analyzed for organochlorines (including total polychlorinated biphenyls [PCBs] and DDE), hepatic microsomal ethoxyresorufin-O-dealkylase (EROD) activity in embryos, and eggshell thickness. Of 1,570 eggs laid, 32% did not hatch and 0.4% had deformed embryos. Of 632 chicks monitored from hatching to 12 d of age, 9% were missing or found dead; no deformities were observed. The PCB concentrations in sample eggs from clutches with deformed embryos (mean = 10.2 μg/g wet weight) and dead embryos (11.4 μg/g) were not significantly higher than concentrations in sample eggs from nests where all eggs hatched (12.1 μg/g). A logistic regression of hatching success versus DDE, dieldrin, and PCB concentrations in sibling eggs identified DDE and not dieldrin or PCBs as a significant risk factor. A logistic regression of hatching success versus DDE and eggshell thickness implicated DDE and not eggshell thickness as a significant risk factor. Even though the insecticide DDT was banned in the early 1970s, we suggest that DDE concentrations in double-crested cormorant eggs in Green Bay are still having an effect on reproduction in this species. |
Databáze: | OpenAIRE |
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