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Aerobic Oxidation of Methane and Ethane by Unconventional Microbes at a Terrestrial Methane Seep in Sicily, Italy

Methane and higher gaseous hydrocarbons (ethane, propane and butane) are important greenhouse gases that contribute to photochemical pollution and ozone production in the atmosphere. Worldwide, the aerobic oxidation of methane and higher gaseous hydrocarbons in soils is one of their largest sinks (Solomon et al., 2007). In natural terrestrial hydrocarbon seeps, microbes can act effectively as microbial filters to oxidize these gases into CO2. However, in contrast to aquatic systems, the microbes involved in these terrestrial systems are less well constrained, in particular with respect to diagnostic biomarker lipids.