Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA.
Environ Pollut. 2012 Feb;161:343-9. doi: 10.1016/j.envpol.2011.08.048. Epub 2011 Oct 11.
Trophic transfer of Hg across lakes within a region has been related to multiple environmental factors, but the nature of these relationships across distinct basins within individual large lakes is unknown. We investigated Hg bioaccumulation in zooplankton in basins of differing trophic status in Lake Champlain (Vermont, USA) to determine the strongest predictors of Hg bioaccumulation. Zooplankton were sampled in Malletts Bay (oligotrophic) and Missisquoi Bay (eutrophic) in 2005-2008. Zooplankton in the eutrophic basin had lower concentrations of total Hg and MeHg than those in the oligotrophic basin in all years but 2007, when no bloom occurred in Missisquoi. In addition, Hg concentrations in seston and small zooplankton, sampled during 2009 at 12 sites spanning the lake, decreased with increasing phytoplankton and zooplankton biomass. Thus, Hg bioaccumulation in zooplankton across basins in Lake Champlain is related to trophic status, as observed previously in multiple lake studies.
在一个区域内，Hg 沿食物链的转移与多种环境因素有关，但在单个大湖的不同盆地中，这些关系的性质尚不清楚。我们研究了尚普兰湖（美国佛蒙特州）不同营养状态盆地中浮游动物体内的 Hg 生物累积情况，以确定 Hg 生物累积的最强预测因子。2005 年至 2008 年间，在马利特湾（贫营养）和米西奎湾（富营养）进行了浮游动物采样。在所有年份，富营养盆地中的浮游动物体内总汞和甲基汞的浓度均低于贫营养盆地，但 2007 年米西奎湾未发生水华时除外。此外，2009 年在跨越该湖的 12 个地点采集的水螅和小型浮游动物中的 seston 和小型浮游动物中的 Hg 浓度随浮游植物和浮游动物生物量的增加而降低。因此，尚普兰湖不同盆地中浮游动物体内的 Hg 生物累积与营养状态有关，这在多项湖泊研究中已有观察结果。
