Abstract
We investigated the blood concentrations of organochlorines (OCs) and the diet of glaucous gulls Larus hyperboreus breeding in two neighbouring areas at Bear Island in the Barents Sea, north-eastern Atlantic. One area was situated on the edge of the large seabird cliff, about 100–150 m above sea level. The second area was about 1–2 km from the seabird cliff, and 10–50 m above sea level. In both 1997 and 1998 there were significant differences between the breeding areas for five OCs (HCB, HCH, Oxychlordan, DDE and PCB) measured, with the birds breeding on the cliff having higher levels. These differences were accompanied by a difference in diet between the areas. Birds in the former area had at least four times higher intake of guillemot Uria spp. eggs, while the birds near sea level seemed to have a much higher intake of fish. This study demonstrates the importance of feeding ecology for the distribution of OCs within populations. The results have important implications for the establishment of monitoring programs for OC contamination of the glaucous gull in the Arctic.
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Bustnes, J.O., Erikstad, K.E., Bakken, V. et al. Feeding Ecology and the Concentration of Organochlorines in Glaucous Gulls. Ecotoxicology 9, 179–186 (2000). https://doi.org/10.1023/A:1008938603257
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DOI: https://doi.org/10.1023/A:1008938603257