Temporal trends of organochlorines and mercury in seabird eggs from the Canadian Arctic, 1975-2003.
Organochlorine pesticides, PCBs, total mercury and selenium were measured in eggs of thick-billed murres, northern fulmars and black-legged kittiwakes collected from Prince Leopold Island in the Canadian High Arctic between 1975 and 2003. The primary organochlorines found were SigmaPCB, p,p'-DDE, oxychlordane, and hexachlorobenzene (HCB). Most of organochlorines analyzed showed either significant declines or no significant change between 1975 and 2003 in all three species. However, significant increases were observed for SigmaHCH in the kittiwakes and fulmars, and beta-HCH in the murres and fulmars. Mercury increased significantly in eggs of murres and fulmars, whereas mercury in the kittiwakes did not change significantly over the study period. Statistical analyses included stable-nitrogen isotope ratios (delta(15)N) to control for any variation in trophic level over time. Although the contaminant concentrations reported in this study are below published threshold values, mercury and beta-HCH concentrations continue to increase suggesting that continued monitoring is warranted.
Braune
Birgit M
BM
Environment Canada, National Wildlife Research Centre, Carleton University, Raven Road, Ottawa, Ontario, K1A 0H3 Canada. birgit.braune@ec.gc.ca
D000818:Animals; D001717:Birds / Q000502:physiology*; D002170:Canada; D002706:Chlordan / Q000031:analogs & derivatives / Q000032:analysis; D003633:Dichlorodiphenyl Dichloroethylene / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D005659:Fungicides, Industrial / Q000032:analysis; D006581:Hexachlorobenzene / Q000032:analysis; D006843:Hydrocarbons, Chlorinated / Q000032:analysis*; D007306:Insecticides / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D009587:Nitrogen Isotopes / Q000032:analysis; D010063:Ovum / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D012643:Selenium / Q000032:analysis; D013997:Time Factors
D004785:Environmental Pollutants; D005659:Fungicides, Industrial; D006843:Hydrocarbons, Chlorinated; D007306:Insecticides; D009587:Nitrogen Isotopes; D010575:Pesticides; D002706:Chlordan; C008743:oxychlordane; D003633:Dichlorodiphenyl Dichloroethylene; D006581:Hexachlorobenzene; D008628:Mercury; D012643:Selenium