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Effects of environmental exposure and diet on levels of persistent organic pollutants (POPs) in eggs of a top predator in the North Atlantic in 1980 and 2008 |
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| Authors: | Leat Eliza H K Bourgeon Sophie Borgå Katrine Strøm Hallvard Hanssen Sveinn A Gabrielsen Geir W Petersen Aevar Olafsdottir Kristin Magnusdottir Ellen Fisk Aaron T Ellis Sandra Bustnes Jan O Furness Robert W |
| Affiliation: | a College of Medical, Veterinary and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, UK b Norwegian Institute for Nature Research, FRAM Centre, 9296 Tromsø, Norway c Norwegian Institute for Water Research, Gaustadalleén 21, 0349 Oslo, Norway d Norwegian Polar Institute, FRAM Centre, 9296 Tromsø, Norway e Icelandic Institute of Natural History, IS-105 Reykjavik, Iceland f University of Iceland, Department of Pharmacology & Toxicology, IS-107 Reykjavik, Iceland g Great Lakes Institute of Environmental Research, University of Windsor, Windsor, Ontario, N9B 3P4, Canada |
| Abstract: | Concentrations of POPs in Great skua eggs from Shetland are among the highest in North Atlantic seabirds, with up to 11,600 μg/kg (ww) DDE and up to 17,900 μg/kg ww ∑PCB. Concentrations of legacy POPs were significantly lower in 2008 than 1980. Decreases were greatest for least persistent compounds. Median ∑PBDEs increased from 99 μg/kg ww in 1980 to 173 μg/kg ww in 2008. There were changes in Great skua breeding season diet, with more adult Herring and Mackerel and less Sandeel. These changes increase exposure to POPs, since Herring and Mackerel accumulate more POPs than Sandeels. In both years, eggs with higher δ15N had higher POP concentrations. In 1980, birds feeding more on demersal discard fish from trawl fisheries and less on Sandeels, had higher POP levels in eggs. In 2008, individuals feeding more on Herring and Mackerel, and less on discards, had higher POP levels in eggs. |
| Keywords: | Persistent organic pollutants Seabird North Atlantic Great skua |
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