Abstract:
:Methane is a potent greenhouse gas responsible for 20-30% of global climate change effects. The global methane budget is ∼500-600 Tg y-1, with the majority of methane produced via microbial processes, including anthropogenic-mediated sources such as ruminant animals, rice fields, sewage treatment facilities and landfills. It is estimated that microbially mediated methane oxidation (methanotrophy) consumes >50% of global methane flux each year. Methanotrophy research has primarily focused on mesophilic methanotrophic representatives and cooler environments such as freshwater, wetlands or marine habitats from which they are sourced. Nevertheless, geothermal emissions of geological methane, produced from magma and lithosphere degassing micro-seepages, mud volcanoes and other geological sources, contribute an estimated 33-75 Tg y-1 to the global methane budget. The aim of this review is to summarise current literature pertaining to the activity of thermophilic and thermotolerant methanotrophs, both proteobacterial (Methylocaldum, Methylococcus, Methylothermus) and verrucomicrobial (Methylacidiphilum). We assert, on the basis of recently reported molecular and geochemical data, that geothermal ecosystems host hitherto unidentified species capable of methane oxidation at higher temperatures.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Houghton KM,Carere CR,Stott MB,McDonald IRdoi
10.1093/femsec/fiz125subject
Has Abstractpub_date
2019-09-01 00:00:00issue
9eissn
0168-6496issn
1574-6941pii
5543213journal_volume
95pub_type
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