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dc.contributor.authorBustnes, Jan Ove
dc.contributor.authorBourgeon, Sophie
dc.contributor.authorLeat, Eliza H. K.
dc.contributor.authorMagnusdottir, Ellen
dc.contributor.authorStrøm, Hallvard
dc.contributor.authorHanssen, Sveinn Are
dc.contributor.authorPetersen, Aevar
dc.contributor.authorGabrielsen, Geir W.
dc.contributor.authorFurness, Robert W.
dc.identifier.citationPLoS ONE 2015, 10(7)nb_NO
dc.description.abstractEnvironmental contaminants may have impacts on reproduction and survival in wildlife populations suffering from multiple stressors. This study examined whether adverse effects of persistent organic pollutants (POPs) increased with poor population health and breeding conditions in three colonies (60–74°N) of great skua (Stercorarius skua) in the north-eastern Atlantic (Shetland, Iceland and Bjørnøya [Bear Island]). POPs (organochlorines [OCs] and polybrominated diphenyl ethers [BDEs]) were measured in plasma of incubating birds (n = 222), concentrations differing nearly tenfold among colonies: Bjørnøya (2009) > Bjørnøya (2010) > Iceland (2009) > Shetland (2009). Reproductive success (hatching success and chick survival) showed that breeding conditions were favourable in Shetland and at Bjørnøya (2010), but were very poor in Iceland and at Bjørnøya (2009). Biomarkers indicated that health was poor in the Shetland population compared to the other populations. Females whose chicks hatched late had high POP concentrations in all colonies except at Bjørnøya (2010), and females losing their eggs at Bjørnøya (2009) tended to have higher concentrations than those hatching. Moreover, there was a negative relationship between female POP concentrations and chick body condition at hatching in Iceland and at Bjørnøya (2010). Supplementary feeding experiments were conducted, and in Iceland where feeding conditions were poor, significant negative relationships were found between female POP concentrations and daily growth-rate in first-hatched chicks of control nests, but not in food supplemented nests. This suggests that negative impacts of POPs were mitigated by improved feeding conditions. For second-chicks, there was a strong negative relationship between the female POP concentrations and growth-rate, but no effects of supplementary feeding. Lowered adult return-rate between breeding seasons with increasing POP loads were found both at Bjørnøya (2009) and in Shetland, especially related to BDEs. This indicates stronger fitness consequences of POPs following seasons with very poor breeding conditions and/or high reproductive effort. This study suggests that the impacts of POPs may differ depending on population health and breeding conditions, and that even low concentrations of POPs could have ecological consequences during adverse circumstances. This is important with regard to risk assessment of biomagnifying contaminants in marine ecosystems.nb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleMultiple Stressors in a Top Predator Seabird:Potential Ecological Consequences ofEnvironmental Contaminants, PopulationHealth and Breeding Conditionsnb_NO
dc.typePeer reviewednb_NO
dc.typeJournal article
dc.relation.projectNorges forskningsråd: 184830nb_NO

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal