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• W4206316174 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Isotope fractionation factors associated with various biogeochemical processes are important in ensuring the reliable use of isotope tracers in biogeosciences at large. Methane is a key component of the subsurface biosphere and a notable greenhouse gas, making the accurate evaluation of methane cycles, including microbial methanotrophy, imperative. Although the isotope fractionation factors associated with methanotrophy have been examined under various conditions, the dual-isotope fractionation factors of aerobic methanotrophy in oxic seawater remain unclear. Here, we investigated hydrogen and carbon isotope ratios of methane as well as the relevant biogeochemical parameters and microbial community compositions in hydrothermal plumes in the Okinawa Trough. Methanotrophs were found to be abundant in plumes above the Hatoma Knoll vent site, and we succeeded in simultaneously determining hydrogen and carbon isotope fractionation factors associated with the aerobic oxidation of methane (<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M1 display=inline overflow=scroll dspmath=mathml><mrow><msup><mi mathvariant=italic>ε</mi><mi mathvariant=normal>H</mi></msup><mo>=</mo><mn mathvariant=normal>49.4</mn><mo>±</mo><mn mathvariant=normal>5.0</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=75pt height=14pt class=svg-formula dspmath=mathimg md5hash=e3301306102c79229517cc5ca8b2b34e><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=bg-18-5351-2021-ie00001.svg width=75pt height=14pt src=bg-18-5351-2021-ie00001.png/></svg:svg></span></span> ‰, <span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M2 display=inline overflow=scroll dspmath=mathml><mrow><msup><mi mathvariant=italic>ε</mi><mi mathvariant=normal>C</mi></msup><mo>=</mo><mn mathvariant=normal>5.2</mn><mo>±</mo><mn mathvariant=normal>0.4</mn></mrow></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=69pt height=14pt class=svg-formula dspmath=mathimg md5hash=614175b12e2a893551c9454f5cd3150c><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=bg-18-5351-2021-ie00002.svg width=69pt height=14pt src=bg-18-5351-2021-ie00002.png/></svg:svg></span></span> ‰) – the former being the first of its kind ever reported. This <span class=inline-formula><i>ε</i>^H</span> value is comparable with values reported from terrestrial ecosystems but clearly lower than those from aerobic and anaerobic methanotroph enrichment cultures, as well as incubations of methanotrophic isolates. The covariation factor between <span class=inline-formula><i>δ</i>¹³</span>C<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M5 display=inline overflow=scroll dspmath=mathml><msub><mi/><mrow class=chem><msub><mi mathvariant=normal>CH</mi><mn mathvariant=normal>4</mn></msub></mrow></msub></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=17pt height=10pt class=svg-formula dspmath=mathimg md5hash=c5c95d00c3681b9285a64c8d98939405><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=bg-18-5351-2021-ie00003.svg width=17pt height=10pt src=bg-18-5351-2021-ie00003.png/></svg:svg></span></span> and <span class=inline-formula><i>δ</i></span>D<span class=inline-formula><math xmlns=http://www.w3.org/1998/Math/MathML id=M7 display=inline overflow=scroll dspmath=mathml><msub><mi/><mrow class=chem><msub><mi mathvariant=normal>CH</mi><mn mathvariant=normal>4</mn></msub></mrow></msub></math><span><svg:svg xmlns:svg=http://www.w3.org/2000/svg width=17pt height=10pt class=svg-formula dspmath=mathimg md5hash=a19c4ac9a18bb1a1d8e665b47b75604a><svg:image xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=bg-18-5351-2021-ie00004.svg width=17pt height=10pt src=bg-18-5351-2021-ie00004.png/></svg:svg></span></span>, <span class=inline-formula>Λ</span> (9.4 or 8.8 determined using two different methods), was consistent with those from methanotrophic isolate incubations. These values are valuable for understanding dynamics of methane cycling in the marine realm, and future applications of the approach to other habitats with methanotrophic activity will help reveal whether the small <span class=inline-formula><i>ε</i>^H</span> value observed is a ubiquitous feature across all marine systems." @default.
• W4206316174 created "2022-01-25" @default.
• W4206316174 creator A5010782193 @default.
• W4206316174 date "2021-08-11" @default.
• W4206316174 modified "2023-09-23" @default.
• W4206316174 title "Reply on RC1" @default.
• W4206316174 doi "https://doi.org/10.5194/bg-2021-167-ac1" @default.
• W4206316174 hasPublicationYear "2021" @default.
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