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Outline
Manganese-dependent anaerobic oxidation of methane (Mn-AOM) is a non-canonical methane sink. Here, we synthesize its conceptual origins, environmental occurrence and activity, microorganisms and electron-transfer routes underpinning the process. Mn-AOM has been reported in sulfur-depleted marine sediments, freshwater environments, and constructed wetlands, with niche-dependent differences in rates and community composition. In marine settings, Mn-AOM is mainly associated with ANME-1 and ANME-2 archaea, whereas freshwater Mn-AOM is dominated by ANME-2d lineages, including Ca. M. manganicus, Ca. M. manganireducens, Ca. M. nitroreducens, and Ca. M. sp. BLZ1. Proposed electron-transfer mechanisms involve multi-heme c-type cytochromes, soluble electron shuttles, and syntrophic interactions with partner bacteria, and may further couple to cryptic sulfur cycling or co-utilization of nitrate as an electron acceptor. Collectively, Mn-AOM expands current frameworks of methane biogeochemistry and holds promise for water and wastewater treatment, warranting future efforts in molecular resolution, quantitative ecological assessment, and engineering translation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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