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Total Hg concentrations in plankton of the various size fractions varied from 49 to 5,504\u2009ng\u2009g\u22121 and MeHg concentrations ranged from 3 to 101\u2009ng\u2009g\u22121. The percentage of Hg as MeHg varied from 0.16 to 70%. Total Hg and MeHg concentrations in plankton samples differed among the three sampling stations with different proximities from the major point sources. The plankton from the site closest to the dam contained the highest concentrations of MeHg. The successive increase of the ratios of MeHg to Hg from seston to macroplankton at all sites indicated that biomagnification is occurring along the plankton food web. However, biomagnification factors (BMF) for MeHg were low (1.5\u20132.0) between trophic levels. Concentrations of THg in seston decreased with an increase of chlorophyll concentrations, suggesting a significant dilution effect by the algae bloom for Hg. Eutrophication dilution may be a reason for lower MeHg accumulation by the four size classes of plankton in this Hg-contaminated reservoir. Environ. Toxicol. Chem. 2011;30:2739\u20132747. \u00a9 2011 SETAC<\/jats:p>","DOI":"10.1002\/etc.696","type":"journal-article","created":{"date-parts":[[2011,9,28]],"date-time":"2011-09-28T01:09:07Z","timestamp":1317172147000},"page":"2739-2747","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Spatial and temporal variations of total and methylmercury concentrations in plankton from a mercury-contaminated and eutrophic reservoir in Guizhou Province, China"],"prefix":"10.1093","volume":"30","author":[{"given":"Qing","family":"Wang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinbin","family":"Feng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 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