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<p>The ocean represents a vast carbon reservoir, where methane concentrations reflect a balance between production and consumption processes. In this study, marine sediments harboring abundant aerobic methanotrophs were incubated under varying methane concentrations. We investigated changes in methane oxidation rates and the community structure of these methanotrophs during incubation. Results demonstrate that methane concentration regulates aerobic methane oxidation. The oxidation rate increased with rising methane concentration up to 50%. However, beyond this threshold, at 80% methane, the oxidation rate declined. Following incubation, the abundance of aerobic methanotrophs increased significantly, with <i>Methylobacterium</i> becoming the dominant genus. Relative abundances of other bacteria potentially associated with alkane degradation, including <i>Planomicrobium, Bacillus, Methylophaga, Erythrobacter, Gillisia</i> and <i>Pontibacter</i>, were also significantly enriched. These findings provide a scientific basis for predicting marine methane emission dynamics, which is crucial for assessing and mitigating the greenhouse gas impact of methane.</p>

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Regulation of aerobic methane oxidation by methane concentration: insights from cultivation experiments

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Qikun Tian,
  • Yu Zhen,
  • Jing Li,
  • Xiaoqing Xu,
  • Changling Liu

摘要

The ocean represents a vast carbon reservoir, where methane concentrations reflect a balance between production and consumption processes. In this study, marine sediments harboring abundant aerobic methanotrophs were incubated under varying methane concentrations. We investigated changes in methane oxidation rates and the community structure of these methanotrophs during incubation. Results demonstrate that methane concentration regulates aerobic methane oxidation. The oxidation rate increased with rising methane concentration up to 50%. However, beyond this threshold, at 80% methane, the oxidation rate declined. Following incubation, the abundance of aerobic methanotrophs increased significantly, with Methylobacterium becoming the dominant genus. Relative abundances of other bacteria potentially associated with alkane degradation, including Planomicrobium, Bacillus, Methylophaga, Erythrobacter, Gillisia and Pontibacter, were also significantly enriched. These findings provide a scientific basis for predicting marine methane emission dynamics, which is crucial for assessing and mitigating the greenhouse gas impact of methane.