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首页> 外文期刊>Environmental Science & Technology >Ratio of Methylmercury to Dissolved Organic Carbon in Water Explains Methylmercury Bioaccumulation Across a Latitudinal Gradient from North-Temperate to Arctic Lakes
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Ratio of Methylmercury to Dissolved Organic Carbon in Water Explains Methylmercury Bioaccumulation Across a Latitudinal Gradient from North-Temperate to Arctic Lakes

机译：甲基汞与水中溶解有机碳的比率解释了北温带至北极湖沿横向梯度的甲基汞生物富集

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src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04180/20171226/images/medium/es-2017-04180k_0006.gif">We investigated monomethylmercury (MMHg) bioaccumulation in lakes across a 30° latitudinal gradient in eastern Canada to test the hypothesis that climate-related environmental conditions affect the sensitivity of Arctic lakes to atmospheric mercury contamination. Aquatic invertebrates (chironomid larvae, zooplankton) provided indicators of MMHg bioaccumulation near the base of benthic and planktonic food chains. In step with published data showing latitudinal declines in atmospheric mercury deposition in Canada, we observed lower total mercury concentrations in water and sediment of higher latitude lakes. Despite latitudinal declines of inorganic mercury exposure, MMHg bioaccumulation in aquatic invertebrates did not concomitantly decline. Arctic lakes with greater MMHg in aquatic invertebrates either had (1) higher water MMHg concentrations (reflecting ecosystem MMHg production) or (2) low water concentrations of MMHg, dissolved organic carbon (DOC), chlorophyll, and total nitrogen (reflecting lake sensitivity). The MMHg:DOC ratio of surface water was a strong predictor of lake sensitivity to mercury contamination. Bioaccumulation factors for biofilms and seston in Arctic lakes showed more efficient uptake of MMHg in low DOC systems. Environmental conditions associated with low biological production in Arctic lakes and their watersheds increased the sensitivity of lakes to MMHg.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04180/20171226/images/medium /es-2017-04180k_0006.gif“>我们调查了加拿大东部沿30°纬度梯度在湖泊中单甲基汞（MMHg）的生物富集，以检验气候相关环境条件影响北极湖对大气汞污染敏感性的假设。水生无脊椎动物（幼虫，浮游动物）提供了底栖和浮游食物链底部附近MMHg生物蓄积的指标。与显示加拿大大气汞沉积的纬度下降的已公布数据同步，我们观察到高纬度湖泊的水和沉积物中的总汞浓度较低。尽管无机汞暴露在纬度上有所下降，但水生无脊椎动物中MMHg的生物蓄积并没有随之下降。水生无脊椎动物中MMHg较高的北极湖泊具有（1）较高的水MMHg浓度（反映了生态系统MMHg的产生）或（2）较低的MMHg，溶解有机碳（DOC），叶绿素和总氮的水浓度（反映了湖的敏感性） 。地表水的MMHg：DOC比值是湖泊对汞污染敏感性的有力预测指标。在低DOC系统中，北极湖泊中生物膜和硒的生物累积因子显示MMHg的吸收效率更高。北极湖泊及其流域生物产量低下的环境条件增加了湖泊对MMHg的敏感性。

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  • 来源
    《Environmental Science & Technology》 |2018年第1期|79-88|共10页
  • 作者

    John Chételat; Murray C. Richardson; Gwyneth A. MacMillan; Marc Amyot; Alexandre J. Poulain;

  • 作者单位

    National Wildlife Research Centre, Environment and Climate Change Canada, Ottawa, Ontario, Canada K1A 0H3;

    Geography and Environmental Studies, Carleton University, Ottawa, Ontario, Canada K1S 5B6;

    Centre d’études nordiques, Département de sciences biologiques, Université de Montréal, Montréal, Quebec, Canada H2V 2S9;

    Centre d’études nordiques, Département de sciences biologiques, Université de Montréal, Montréal, Quebec, Canada H2V 2S9;

    Department of Biology, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5;

  • 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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