Abstract
Methane bio-oxidation plays an important role in the global methane balance and greenhouse gases mitigation. Oxygen (O2) is one of the significant factors in methane bio-oxidation. The O2 concentration in the environments not only can affect community structure and activity of aerobic methanotrophs and the distribution of methane-derived carbon, but also aerobic methanotrophs have various ways of metabolism at different O2 concentrations. It is meaningful for carbon cycle and biodiversity of methane-driven ecosystem to understand the hypoxia-tolerance mechanisms of aerobic methanotrophs and methane bio-oxidation in O2-limited environments. In this paper, the activity and community structure of aerobic methanotrophs in O2-limited environments were summarized. The hypoxia-tolerance mechanism of aerobic methanotrophs and the relationship between methanotrophs and non-methanotrophs in O2-limited environments were reviewed. Future studies about aerobic methanotrophs were also discussed.
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