ArticleFrontiers in microbiology2025
Lipid biomarkers reveal dominance of aerobic methanotrophy in a continental serpentinizing system.
Article in Frontiers in microbiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Sources and sinks of methane within an advanced serpentinization-influenced system were investigated at the Coast Range Ophiolite Microbial Observatory (CROMO) in Lower Lake, California. Subsurface water-rock reactions at CROMO contribute to unique, high pH groundwaters and substantial methane emissions. We performed lipid analysis on biomass and measured radiocarbon and stable carbon isotopic composition of groundwater to trace the origins and fate of methane. Specific groups of microorganisms involved in methane cycling were identified through analysis of membrane lipid components. Aerobic methanotrophs dominated the samples, with evidence of heterotrophic bacteria but no detection of anaerobic methanotrophy or methanogens. Following these data, microbial activity may be a significant sink but not a major source of methane at this site.
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