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Contrasting time trends of organic contaminants in Antarctic pelagic and benthic food webs |
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| Authors: | van den Brink Nico W Riddle Martin J van den Heuvel-Greve Martine van Franeker Jan Andries |
| Institution: | a Alterra, Wageningen UR, Box 47, NL-6700AA Wageningen, The Netherlands b Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia c IMARES, Wageningen UR, Box 77, NL-4400 AB Yerseke, The Netherlands d IMARES Wageningen UR, Box 167, NL-1790AD Den Burg (Texel), The Netherlands |
| Abstract: | We demonstrate that pelagic Antarctic seabirds show significant decreases in concentrations of some persistent organic pollutants. Trends in Adélie penguins and Southern fulmars fit in a general pattern revealed by a broad literature review. Downward trends are also visible in pelagic fish, contrasting sharply with steady or increasing concentrations in Antarctic benthic organisms. Transfer of contaminants between Antarctic pelagic and benthic food webs is associated with seasonal sea-ice dynamics which may influence the balance between the final receptors of contaminants under different climatic conditions. This complicates the predictability of future trends of emerging compounds in the Antarctic ecosystem, such as of the brominated compounds that we detected in Antarctic petrels. The discrepancy in trends between pelagic and benthic organisms shows that Antarctic biota are still final receptors of globally released organic contaminants and it remains questionable whether the total environmental burden of contaminants in the Antarctic ecosystem is declining. |
| Keywords: | Antarctica Organochlorines Time trends Food web Pelagic versus benthic |
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