Temporal Trends in Beluga, Narwhal and Walrus Mercury Levels: Links to Climate Change
作者： A. Gaden , G. A. Stern
DOI: 10.1007/978-90-481-9121-5_10
关键词:
摘要: The exposure of Arctic marine mammals to contaminants may change via ecological dynamics in response climate change. For example, changes the structure food web or shifts regional foraging could affect dietary exposure. We examined temporal variation total mercury (THg) concentrations Hudson Bay beluga (Delphinapterus leucas) and Foxe Basin walrus (Odobenus rosmarus rosmarus) narwhal (Monodon monoceros) with δ15N δ13C signatures (beluga only) North Atlantic Oscillation. found THg female Arviat muscle tissue decreased significantly from early 1980s 2008. Similarly sampled declined over same time period. NAO index did not appear nor strongly influence concentrations. Results suggest summering forage more offshore areas upon less contaminated prey increasing ice-free season last couple decades. As sea ice continues recede, continually decrease other mammals.
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