Manganese/iron-supported sulfate-dependent anaerobic oxidation of methane by archaea in lake sediments

Su, Guangyi and Zopfi, Jakob and Yao, Haoyi and Steinle, Lea and Niemann, Helge and Lehmann, Moritz F.. (2020) Manganese/iron-supported sulfate-dependent anaerobic oxidation of methane by archaea in lake sediments. Limnology and Oceanography, 65 (4). pp. 863-875.

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Official URL: https://edoc.unibas.ch/74794/

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Anaerobic oxidation of methane (AOM) by methanotrophic archaea is an important sink of this greenhouse gas in marine sediments. However, evidence for AOM in freshwater habitats is rare, and little is known about the pathways, electron acceptors, and microbes involved. Here, we show that AOM occurs in anoxic sediments of a sulfate‐rich lake in southern Switzerland (Lake Cadagno). Combined AOM‐rate and 16S rRNA gene‐sequencing data suggest that Candidatus Methanoperedens archaea are responsible for the observed methane oxidation. Members of the Methanoperedenaceae family were previously reported to conduct nitrate‐ or iron/manganese‐dependent AOM. However, we demonstrate for the first time that the methanotrophic archaea do not necessarily rely upon these oxidants as terminal electron acceptors directly, but mainly perform canonical sulfate‐dependent AOM, which under sulfate‐starved conditions can be supported by metal (Mn, Fe) oxides through oxidation of reduced sulfur species to sulfate. The correspondence of high abundances of Desulfobulbaceae and Candidatus Methanoperedens at the same sediment depth confirms the interdependence of anaerobic methane‐oxidizing archaea and sulfate‐reducing bacteria. The relatively high abundance and widespread distribution of Candidatus Methanoperedens in lake sediments highlight their potentially important role in mitigating methane emissions from terrestrial freshwater environments to the atmosphere, analogous to ANME‐1, ‐2, and ‐3 in marine settings.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Aquatic and Isotope Biogeochemistry (Lehmann)
UniBasel Contributors:Lehmann, Moritz F and Zopfi, Jakob and Su, Guangyi and Niemann, Helge
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Society of Limnology and Oceanography
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:14 Apr 2021 12:17
Deposited On:05 Apr 2020 17:32

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