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首页> 外文期刊>Environmental Science & Technology >Molecular Insights on Dissolved Organic Matter Transformation by Supraglacial Microbial Communities
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Molecular Insights on Dissolved Organic Matter Transformation by Supraglacial Microbial Communities

机译：超冰川微生物对溶解有机物转化的分子认识

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摘要

Snow overlays the majority of Antarctica and is an important repository of dissolved organic matter (DOM). DOM transformations by supraglacial microbes are not well understood. We use ultrahigh resolution mass spectrometry to elucidate molecular changes in snowpack DOM by in situ microbial processes (up to 55 days) in a coastal Antarctic site. Both autochthonous and allochthonous DOM is highly bioavailable and is transformed by resident microbial communities through parallel processes of degradation and synthesis. DOM thought to be of a more refractory nature, such as dissolved black carbon and carboxylic-rich alicyclic molecules, was also rapidly and extensively reworked. Microbially reworked DOM exhibits an increase in the number and magnitude of N-, S-, and P-containing formulas, is less oxygenated, and more aromatic when compared to the initial DOM. Shifts in the heteroatom composition suggest that microbial processes may be important in the cycling of not only C, but other elements such as N, S, and P. Microbial reworking also produces photoreactive compounds, with potential implications for DOM photochemistry. Refined measurements of supraglacial DOM and their cycling by microbes is critical for improving our understanding of supraglacial DOM cycling and the biogeochemical and ecological impacts of DOM export to downstream environments.
机译：雪覆盖了南极洲的大部分地区，是溶解性有机物（DOM）的重要储存库。冰川上微生物对DOM的转化知之甚少。我们使用超高分辨率质谱通过南极沿海站点的原位微生物过程（长达55天）阐明积雪堆DOM中的分子变化。本地和异源DOM都具有很高的生物利用度，并通过降解和合成的并行过程由驻留的微生物群落转化。 DOM被认为具有更难处理的性质，例如溶解的黑碳和富含羧基的脂环族分子，也得到了迅速而广泛的重新加工。经微生物重制的DOM与原始DOM相比，其含N-，S-和P的配方的数量和大小都有所增加，含氧量更低，且芳香性更高。杂原子组成的变化表明，微生物过程可能不仅对C循环，而且对其他元素（如N，S和P）的循环也很重要。微生物再加工还会产生光反应性化合物，这对DOM光化学具有潜在的影响。微生物对上冰川期DOM及其循环的精细测量对于增进我们对冰川上DOM循环以及DOM出口到下游环境的生物地球化学和生态影响的理解至关重要。

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  • 来源
    《Environmental Science & Technology》 |2017年第8期|4328-4337|共10页
  • 作者

    Runa Antony; Amanda S. Willoughby; Amanda M. Grannas; Victoria Catanzano; Rachel L. Sleighter; Meloth Thamban; Patrick G. Hatcher; Shanta Nair;

  • 作者单位

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-Da-Gama, Goa 403 804, India;

    Old Dominion University, Department of Chemistry and Biochemistry, Norfolk, Virginia 23529, United States;

    Villanova University, Department of Chemistry, Villanova, Pennsylvania 19085, United States;

    Villanova University, Department of Chemistry, Villanova, Pennsylvania 19085, United States;

    Old Dominion University, Department of Chemistry and Biochemistry, Norfolk, Virginia 23529, United States,FBSciences, Inc. (Research and Development), Norfolk, Virginia 23508, United States;

    National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-Da-Gama, Goa 403 804, India;

    Old Dominion University, Department of Chemistry and Biochemistry, Norfolk, Virginia 23529, United States;

    National Institute of Oceanography, Dona Paula, Goa 403 004, India;

  • 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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