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首页> 外文期刊>Environmental Science & Technology >Methylmercury Bioaccumulation in Stream Food Webs Declines with Increasing Primary Production
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Methylmercury Bioaccumulation in Stream Food Webs Declines with Increasing Primary Production

机译：初级食品产量的增加导致下游食品网中甲基汞的生物积累下降

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摘要

Opposing hypotheses posit that increasing primary productivity should result in either greater or lesser contaminant accumulation in stream food webs. We conducted an experiment to evaluate primary productivity effects on MeHg accumulation in stream consumers. We varied light for 16 artificial streams creating a productivity gradient (oxygen production =0.048-0.71 mg O_2 L~(-1) d~(-1)) among streams. Two-level food webs were established consisting of phytoplankton/filter feeding clam, periphyton/grazing snail, and leaves/shredding amphipod (Hyalella azteca). Phyto- plankton and periphyton biomass, along with MeHg removal from the water column, increased significantly with productivity, but MeHg concentrations in these primary producers declined. Methylmercury concentrations in clams and snails also declined with productivity, and consumer concentrations were strongly correlated with MeHg concentrations in primary producers. Heterotroph biomass on leaves, MeHg in leaves, and MeHg in Hyalella were unrelated to stream productivity. Our results support the hypothesis that contaminant bioaccumulation declines with stream primary production via the mechanism of bloom dilution (MeHg burden per cell decreases in algal blooms), extending patterns of contaminant accumulation documented in lakes to lotic systems.
机译：相反的假说认为，提高初级生产力将导致流食网中污染物的积累或多或少。我们进行了一项实验，以评估初级生产力对溪流消费者中MeHg积累的影响。我们改变了16条人造溪流的光，在溪流之间产生了生产率梯度（产氧量= 0.048-0.71 mg O_2 L〜（-1）d〜（-1））。建立了两级食物网，包括浮游植物/滤食蛤，周生植物/放牧蜗牛和叶片/切碎的两栖纲（Hyalella azteca）。浮游植物和浮游生物的生物量，以及从水柱中除去的甲基汞，随着生产率的提高而显着增加，但这些初级生产者中甲基汞的浓度却下降了。蛤和蜗牛中的甲基汞浓度也随着生产力的下降而下降，消费者的浓度与初级生产者中的甲基汞浓度高度相关。叶片上的异养生物质，叶片中的MeHg和Hyalella中的MeHg与河流生产力无关。我们的研究结果支持这样的假说，即通过水华稀释机理（藻水华，每个细胞的MeHg负荷降低），污染物的生物蓄积量随着溪流初级生产而下降，从而将湖泊中记录的污染物积聚模式扩展至抽水系统。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|7763-7769|共7页
  • 作者

    David M. Walters; David F. Raikow; Chad R. Hammerschmidt; Molly G. Mehling; Amanda Kovach; James T. Oris;

  • 作者单位

    U.S. Geological Survey, Fort Collins Science Center, 2150 Centre Avenue, Building C, Fort Collins, Colorado 80526, United States;

    U.S. Environmental Protection Agency, National Exposure Research Laboratory, Ecological Exposure Research Division, 26 West Martin Luther King Drive, Cincinnati, Ohio 45268, United States,National Park Service, Inventory and Monitoring, Building 22, 1 Crater Rim Drive, Hawaii National Park, HI, 96785;

    Department of Earth & Environmental Sciences, Wright State University, Dayton, Ohio 45435, United States;

    Department of Biology, Miami University, Oxford, Ohio 45056, United States, 120 Dilworth Hall, Woodland Road, Chatham University, Pittsburgh, PA 15232;

    Department of Biology, Miami University, Oxford, Ohio 45056, United States,GEI Consultants, Inc., 4601 DTC Blvd, Denver, CO 80237;

    Department of Biology, Miami University, Oxford, Ohio 45056, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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