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首页> 外文期刊>The ISME journal emultidisciplinary journal of microbial ecology >Active pathways of anaerobic methane oxidation across contrasting riverbeds
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Active pathways of anaerobic methane oxidation across contrasting riverbeds

机译：陷阱河床血管甲烷氧化的活性途径

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摘要

Anaerobic oxidation of methane (AOM) reduces methane emissions from marine ecosystems but we know little about AOM in rivers, whose role in the global carbon cycle is increasingly recognized. We measured AOM potentials driven by different electron acceptors, including nitrite, nitrate, sulfate, and ferric iron, and identified microorganisms involved across contrasting riverbeds. AOM activity was confined to the more reduced, sandy riverbeds, whereas no activity was measured in the less reduced, gravel riverbeds where there were few anaerobic methanotrophs. Nitrite-dependent and nitrate-dependent AOM occurred in all sandy riverbeds, with the maximum rates of 61.0 and 20.0 nmol CO2 g(-1) (dry sediment) d(-1), respectively, while sulfate-dependent and ferric iron-dependent AOM occurred only where methane concentration was highest and the diversity of AOM pathways greatest. Diverse Candidatus Methylomirabilis oxyfera (M. oxyfera)-like bacteria and Candidatus Methanoperedens nitroreducens (M. nitroreducens)-like archaea were detected in the sandy riverbeds (16S rRNA gene abundance of 9.3 x 10(5) to 1.5 x 10(7) and 2.1 x 10(4) to 2.5 x 10(5) copies g(-1) dry sediment, respectively) but no other known anaerobic methanotrophs. Further, we found M. oxyfera-like bacteria and M. nitroreducens-like archaea to be actively involved in nitrite-and nitrate/ferric iron-dependent AOM, respectively. Hence, we demonstrate multiple pathways of AOM in relation to methane, though the activities of M. oxyfera-like bacteria and M. nitroreducens-like archaea are dominant.
机译：甲烷（AOM）的厌氧氧化可降低海洋生态系统的甲烷排放，但我们对河流中的AOM知之甚少，其在全球碳周期中的作用越来越识别。我们测得由不同的电子受体驱动的AOM电位，包括亚硝酸盐，硝酸盐，硫酸铁和铁，并鉴定涉及对比河床的微生物。 AOM活性被限制在桑迪河床上，而没有以少量减少的碎石河床在少量减少的情况下测量。所有沙质河床中发生亚硝酸盐依赖性和硝酸盐依赖性AOM，最大速率分别为61.0和20.0 nmol CO 2 G（-1）（干燥沉淀）D（-1），而硫酸盐依赖性和铁依赖性仅发生甲烷浓度最高，也是AOM途径最大的多样性。多样化的Candidatus甲基咪唑isoxima（M. Intailira） - 样细菌和Candidatus Methanopersedens Nitroreducens（M. nitroreducens）在沙质河床中检测到（16s rRNA基因大量9.3×10（5）至1.5 x 10（7）和1.5×10（7） 2.1 x 10（4）至2.5 x 10（5）份拷贝g（-1）干沉积物，但没有其他已知的厌氧甲醇萎缩。此外，我们发现M. Inariera样细菌和M.硝化琥珀般的古亚亚硝酸盐，分别积极参与亚硝酸盐和硝酸铁依赖性AOM。因此，我们展示了与甲烷相关的多种途径，尽管M. Invenera样细菌和M.硝化琥珀酰胺的活动占主导地位。

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