Additional file 1: of Hydrogen and carbon isotope systematics in hydrogenotrophic methanogenesis under H2-limited and H2-enriched conditions: implications for the origin of methane and its isotopic diagnosis

Compilation of hydrogen and carbon isotope systematics from incubation and observation. Description of data: Type of ecosystem, name of ecosystem, temperature of methanogen growth (Celsius), approximate timescale for growth, fractionation factors of the carbon isotope ratio between CH4 and CO2 ( α C C H 4 – C O 2 $$ {\upalpha^{\mathrm{C}}}_{{\mathrm{C}\mathrm{H}}_4\hbox{--} {\mathrm{C}\mathrm{O}}_2} $$ ), fractionation factors of the hydrogen isotope ratio between CH4 and H2O ( α H C H 4 – H 2 O $$ {\upalpha^{\mathrm{H}}}_{{\mathrm{CH}}_4\hbox{--} {\mathrm{H}}_2\mathrm{O}} $$ ), and references. (XLSX 53 kb)