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Dietary versus maternal sources of organochlorines in top predator seabird chicks: An experimental approach

Environmental Science and Technology, ISSN: 0013-936X, Vol: 47, Issue: 11, Page: 5963-5970
2013
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Article Description

We examined the relative importance of dietary sources and maternal transfer on organochlorine concentrations (ΣOCs) in Great skua chicks (Stercorarius skua) in Shetland by food supplementing parents with known wintering area. We predicted that experimental chicks (whose parents were supplemented) should have (i) higher growth rates and, (ii) lower ΣOCs due to growth dilution effect and/or due to being fed with less contaminated food compared to control chicks. We also predicted a significant influence of maternal wintering area on chicks' ΣOCs. Plasma ΣOCs of adults, assessed prior to the manipulation, significantly differed between wintering areas of birds. Chicks were weighed every 5 days and plasma ΣOCs were assessed at 20 days old. Based on nitrogen and carbon stable isotope analysis, the supplementary food contributed on average 20% of the dietary protein of the chicks. Although experimental chicks experienced better developmental conditions, supplementary food did not alleviate their organochlorine burden. Nevertheless, chicks whose mothers wintered in Europe showed ΣOCs 50% higher than chicks whose mothers wintered in Africa. Moreover, based on the positive relationship between ΣOCs of chicks and females, the contaminant load of Great skua chicks in Shetland appears to be more influenced by maternal transfer than by trophic transfer. © 2013 American Chemical Society.

Bibliographic Details

Bourgeon, Sophie; Leat, Eliza K H; Furness, Robert W; Borgå, Katrine; Hanssen, Sveinn Are; Bustnes, Jan Ove

American Chemical Society (ACS)

Chemistry; Environmental Science

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