| 摘 要： | It is still disputed in the scientific community whether it is possible to trace a direct link or even proportionality between mercury （Hg） anthropogenic loadings to lake ecosystems and resulting methylmercury （MeHg） levels found in fish tissues. We present here the exemplary case of the Baihua Reservoir, located on the Maotiahoe River, near Guiyang （Guizhou, China）. Baihua was impacted for many years by Hg-contaminated effluents from industrial source. While sedimentary profiles exhibit extreme enrichment in sedimentary Hg burden, fish species harvested from the reservoir still present low Hg levels. Thus we propose here that in the case of Hg, loading does not tell it all and one must take it into account the net methylation capacity of lake ecosystems and its ability to efficiently bioaccumulate MeHg along the trophic web.
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