Mercury and Organochlorine Contamination in Brown Trout (Salmo Trutta) and Arctic Charr (Salvelinus Alpinus) from High Mountain Lakes in Europe and the Svalbard Archipelago

S. Rognerud1, J. O. Grimalt2, B. O. Rosseland3, P. Fernandez2, R. Hofer4, R. Lackner4, B. Lauritzen3, L. Lien3, J. C. Massabuau5, A. Ribes2
1Norwegian Institute for Water Research, Ottestad, Norway
2Department of Environmental Chemistry (I.C.E.R.-C.S.I.C.), Barcelona, Spain
3Norwegian Institute for Water Research, Oslo, Norway
4Institute für Zoologie und Limnologie, Innsbruck, Austria
5Laboratoire d'Écophysiologie et Écotoxicologie des systemes Aquatiques, Université Bordeaux 1 et CNRS, France

Tóm tắt

High concentration of Hg, less volatile PCB congeners and p,p′-DDE in Arctic charr from an arctic lake was mainly causedby biomagnification in the food chain where cannibalism was thedriving force. We suggest that low sediment fluxes of Hg, low net production of methyl mercury, and short food chains excludingpiscivory explain the low levels of Hg in the invertebrate feeding fish population in five European high mountain lakes.Concentrations of less volatile PCB congeners in insectivorous fish populations from the European high mountain lakes were mainly influenced by fish age and atmospheric deposition, indicated by the sediment inventory. Atmospheric deposition influenced by local sources may explain the higher concentrationsof pesticides (p,p′-DDT, p,p′-DDE and γ-HCH) observedin fish from the Pyrenees compared to the other sites. Theconcentrations of Hg and organochlorines did not exceedthe guidelines for fish consumption, except for Hg levelsin the oldest fish from the arctic lake.

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