The global methane cycle: recent advances in understanding the microbial processes involved.

By R. Conrad. Environmental Microbiology Reports, 2009

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Using microbial communities and extracellular enzymes to link soil organic matter characteristics to greenhouse gas production in a tidal freshwater wetland (2014, background): “2005) and are responsible for nearly 25 % of global methane (CH4) emissions (Conrad 2009).”
Structure, variation, and assembly of the root-associated microbiomes of rice (2015, background): “Global rice cultivation accounts for a significant proportion of annual greenhouse gas emissions, primarily methane (32).”
Global prevalence of methane oxidation by symbiotic bacteria in peat-moss ecosystems (2010, background): “Wetlands are among the largest natural sources of atmospheric methan”
Evidence for methane production by the marine algae Emiliania huxleyi (2016, background): “Concentrations of CH4 in near-surface waters are often 5–75 % supersaturated with respect to the atmosphere, implying a net flux from the ocean to the atmosphere (Conrad, 2009; Reeburgh, 2007; Scranton and Brewer, 1977).”
Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp (2011, background): “However, in the absence of direct oxygen measurements, it remains debatable if a zooplankton gut can be anoxic and support methanogenesis (Conrad 2009).”