Recent changes in levels of persistent organochlorines and mercury in eggs of seabirds from the Barents Sea |
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| Authors: | Barrett R T Skaare J U Gabrielsen G W |
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| Institution: | 1. Department of Experimental Medicine, Section of Bioscience and Medical Embryology, School of Medicine, University of Perugia, Perugia, Italy;2. Occupational Medicine, Perugia, Italy;1. Division of General Internal Medicine/Zuckerberg San Francisco General Hospital, University of California, San Francisco, United States;2. Division of General Internal Medicine, Department of Medicine, University of California, San Francisco, United States;3. Division of HIV/AIDS, Department of Medicine, University of California, San Francisco, United States;4. Division of General Internal Medicine, Department of Medicine, Massachusetts General Hospital, United States;1. Centre for Wildlife Ecology, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada;2. US Geological Survey, Alaska Science Center, 4210 University Drive, Anchorage, AK 99508, USA;3. Science and Technology Branch, Environment and Climate Change Canada, 5421 Robertson Road, Delta, BC V4K 3N2, Canada;4. Stantec Consulting Ltd., 2042 Mills Rd W, Sidney, BC V8L 5X4, Canada;5. Centre for Wildlife Ecology, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada |
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| Abstract: | Eggs of ten seabird species were collected from six regions in North Norway, Svalbard and NW Russia in 1993, and were analyzed for organochlorines (OCs) and mercury. Significant declines in levels of PCBs, p,p'-DDE, HCB, beta-HCH, gamma-HCH and oxychlordane were documented in nearly half the data set since a similar study in 1983 in six of the seabird species breeding in North Norway. Only four of the 90 paired data sets increased significantly, and the remainder remained unchanged. There was very little change in mercury levels. The decline in OCs corresponds to similar declines found in Canada and the Baltic Sea, and to declines documented in marine fish in a Norwegian fjord. They can all be attributed to the reduction in use and spread of contaminants, both in Norway and internationally. No consistent regional differences in residue levels were found. |
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