Total mercury in wild fish in Guizhou reservoirs, China |
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Authors: | Haiyu Yan Atle Rustadbakken Heng Yao Thorjorn Larssen Xinbin Feng Ting Liu Lihai Shang and Thrond O Haugen |
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Institution: | 1. State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China 2. Norwegian Institute for Water Research,0349 Oslo,Norway 3. Norwegian Institute for Water Research,0349 Oslo,Norway;Department of Chemistry,University of Oslo,0316 Oslo,Norway 4. Guizhou Institute for Agriculture,Guiyang,Guizhou 550025,China |
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Abstract: | The health hazard of mercury (Hg) compounds is internationally recognized, and the main pathways for methylmercury (MeHg)
intake in humans are through consumption of food, especially fish. Given the large releases of Hg to the environment in China, combined
with the fast development of hydropower, this issue deserves attention. Provided similar mobilization pathways of Hg in China as seen
in reservoirs in North America and Europe one should expect increased Hg contamination in relation to future hydropower reservoir
construction in this country. This study presents total Hg (THg) concentrations in wild fish from six Guizhou reservoirs, China. The
THg concentrations in fish were generally low despite high background levels in the bedrock and depositions from local point sources.
The over all mean SD concentration of THg was (0.066 0.078) g/g (n = 235). After adjusting for among-reservoir variation in
THg, there were significant di erences in THg among functional groups of the fish, assumed to reflect trophic levels. Predicted THgconcentration
ratios, retrieved from a mixed linear model, between the functional groups were 9:4:4:1 for carnivorous, omnivorous,
planktivorous and herbivorous fish. This result indicated that MeHg accumulation may prevail even under circumstances with short
food chains as in this Chinese water system. No fish exceeded recommended maximum THg limit for human consumption set by
World Health Organization and the Standardization Administration of China (0.5 g/g fish wet weight (ww)). Only six fish (2.5%)
exceeded the maximum THg limit set by US Environmental Protection Agency (0.3 g/g fish ww). |
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Keywords: | bioaccumulation mercury methylation mixed linear models aquatic food web lakes |
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