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首页> 外文期刊>Environmental Science & Technology >Algal Organic Matter Drives Methanogen-Mediated Methylmercury Production in Water from Eutrophic Shallow Lakes
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Algal Organic Matter Drives Methanogen-Mediated Methylmercury Production in Water from Eutrophic Shallow Lakes

机译：藻类有机物驱动来自富营养浅湖泊的水中甲基介导的甲基汞生产

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摘要

Algal blooms bring massive amounts of algal organic matter (AOM) into eutrophic lakes, which influences microbial methylmercury (MeHg) production. However, because of the complexity of AOM and its dynamic changes during algal decomposition, the relationship between AOM and microbial Hg methylators remains poorly understood, which hinders predicting MeHg production and its bioaccumulation in eutrophic shallow lakes. To address that, we explored the impacts of AOM on microbial Hg methylators and MeHg production by characterizing dissolved organic matter with Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) and three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy and quantifying the microbial Hg methylation gene hgcA. We first reveal that the predominance of methanogens, facilitated by eutrophication-induced carbon input, could drive MeHg production in lake water. Specifically, bioavailable components of AOM (i.e., CHONs such as aromatic proteins and soluble microbial byproduct-like materials) increased the abundances (Archaea-hgcA gene: 438-2240% higher) and activities (net CH_4 production: 16.0-44.4% higher) of Archaea (e.g., methanogens). These in turn led to enhanced dissolved MeHg levels (24.3-15,918% higher) for three major eutrophic shallow lakes in China. Nevertheless, our model results indicate that AOM-facilitated MeHg production could be offset by AOM-induced MeHg biodilution under eutrophication. Our study would help reduce uncertainties in predicting MeHg production, providing a basis for mitigating the MeHg risk in eutrophic lakes.
机译：藻类绽放将大量的藻类有机物（AOM）纳入富营养化湖泊，这影响了微生物甲基汞（MEHG）的生产。然而，由于AOM的复杂性及其在藻类分解期间的动态变化，AOM与微生物HG甲基甲苯之间的关系仍然难以理解，其阻碍预测MEHG生产及其在富营养化浅湖中的生物累积。为了解决这个问题，我们探讨了AOM对微生物HG甲基甲酸甲基甲苯的影响，通过用傅里叶变换离子回旋谐振质谱（FTICR-MS）和三维激发 - 发射基质（3D-eEM）荧光光谱法表征溶解的有机物并量化微生物Hg甲基化基因HGCA。我们首先揭示甲烷酮的优势，通过富营养化诱导的碳投入促进，可以在湖水中推动Mehg生产。具体地，AOM的生物可利用组分（即，诸如芳族蛋白质和可溶性微生物副产物的材料）增加了丰度（archaea-hgca基因：438-2240％，活动（净CH_4生产：16.0-44.4％） archaea（例如，甲烷增长）。这些反过来导致了中国三大富营养化浅湖的增强溶解的MEHG水平（24.3-15,918％）。尽管如此，我们的模型结果表明Aom促进的Mehg生产可能在富营养化下的Aom诱导的Mehg生物硫化。我们的研究将有助于减少预测MEHG生产的不确定性，为减轻富营养化湖泊的MEHG风险提供依据。

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  • 来源
    《Environmental Science & Technology》 |2021年第15期|10811-10820|共10页
  • 作者

    Pei Lei; Jin Zhang; Jinjie Zhu; Qjaoguo Tan; Raymond W. M. Kwong; Ke Pan; Tao Jiang; Mohammad Naderi; Huan Zhong;

  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210023 P. R. China;

    State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210023 P. R. China;

    State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210023 P. R. China;

    Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies College of the Environment and Ecology and Center for Marine Environmental Chemistry and Toxicology Xiamen University Xiamen Fujian 361102 P. R. China;

    Department of Biology York University Toronto Ontario M3J 1P3 Canada;

    Institute for Advanced Study Shenzhen University Shenzhen 518060 P. R China;

    Interdisciplinary Research Centre for Agriculture Green Development in Yangtze River Basin College of Resources and Environment Southwest University Chongqing 400716 China Department of Forest Ecology and Management Swedish University of Agricultural Sciences Umea SE-90183 Sweden;

    Department of Biology York University Toronto Ontario M3J 1P3 Canada;

    State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Nanjing 210023 P. R. China Environmental and Life Science Program (EnLS) Trent University Peterborough Ontario K9L 0G2 Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    methylmercury; organic matter; methanogens; eutrophication; lake;

    机译：甲基汞;有机物;甲烷;富营养化;湖;

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