Mercury concentrations in landlocked Arctic char (Salvelinus alpinus) from the Canadian Arctic. Part I: Insights from trophic relationships in 18 lakes
作者： Nikolaus Gantner , Michael Power , Deborah Iqaluk , Markus Meili , Hans Borg
DOI: 10.1002/ETC.95
关键词: Food web 、 Environmental science 、 Arctic char 、 Food chain 、 Salvelinus 、 Arctic 、 Biomagnification 、 Ecology 、 Trophic level 、 Periphyton
摘要: Concentrations of mercury (Hg) have increased slowly in landlocked Arctic char over a 10- to 15-year period the Arctic. Fluxes Hg sediments also show increases most lakes. Correlation with trophic level (TL) was used investigate and compare biomagnification food webs from lakes Canadian sampled 2002 2007. (total methylmercury (MeHg)) were compared across longitudinal latitudinal gradients relation d 13 C 15 Ni n periphyton, zooplankton, benthic invertebrates, varying size-classes. Trophic magnification factors (TMFs) calculated for web each lake related available physical chemical characteristics The relative content MeHg 4.3 12.2% 41 79% 59 72% insects, 74 100% juvenile adult char. signatures indicated coupling invertebrates. Cannibalism among lengthened chain. Biomagnification confirmed all 18 lakes, TMFs ranging 3.5 � 1.1 64.3 0.8. Results indicate that chain length (FCL) are key explaining interlake variability different Environ. Toxicol. Chem. 2010;29:621-632. # 2009 SETAC
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