Insights into low fish mercury bioaccumulation in a mercury-contaminated reservoir, Guizhou, China |
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Authors: | Liu Bian Yan Haiyu Wang Cuiping Li Qiuhua Guédron Stéphane Spangenberg Jorge E Feng Xinbin Dominik Janusz |
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Institution: | Institute F. -A. Forel, University of Geneva, route de Suisse 10, C.P. 416, CH-1290 Versoix, Switzerland. bl2444@columbia.edu |
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Abstract: | We examined Hg biogeochemistry in Baihua Reservoir, a system affected by industrial wastewater containing mercury (Hg). As expected, we found high levels of total Hg (THg, 664-7421 ng g(-1)) and monomethylmercury (MMHg, 3-21 ng g(-1)) in the surface sediments (0-10 cm). In the water column, both THg and MMHg showed strong vertical variations with higher concentrations in the anoxic layer (>4m) than in the oxic layer (0-4 m), which was most pronounced for the dissolved MMHg (p < 0.001). However, mercury levels in biota samples (mostly cyprinid fish) were one order of magnitude lower than common regulatory values (i.e. 0.3-0.5 mg kg(-1)) for human consumption. We identified three main reasons to explain the low fish Hg bioaccumulation: disconnection of the aquatic food web from the high MMHg zone, simple food web structures, and biodilution effect at the base of the food chain in this eutrophic reservoir. |
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