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RISS 인기검색어
- 검색키워드
- 저자 : Stadnitskaia, Alina (검색결과 1 건)
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Lee, Dong-Hun,Kim, Jung-Hyun,Lee, Yung Mi,Stadnitskaia, Alina,Jin, Young Keun,Niemann, Helge,Kim, Young-Gyun,Shin, Kyung-Hoon Copernicus GmbH 2018 Biogeosciences Vol.15 No.24
<P><p><strong>Abstract.</strong> In this study, we report lipid biomarker patterns and phylogenetic identities of key microbial communities mediating anaerobic oxidation of methane (AOM) in active mud volcanoes (MVs) on the continental slope of the Canadian Beaufort Sea. The carbon isotopic compositions (<span class='inline-formula'><i>δ</i><sup>13</sup>C</span>) of <i>sn</i>-2- and <i>sn</i>-3-hydroxyarchaeol showed the highly <span class='inline-formula'><sup>13</sup>C</span>-depleted values (<span class='inline-formula'>−</span>114<span class='thinspace'></span>‰ to <span class='inline-formula'>−</span>82<span class='thinspace'></span>‰) associated with a steep depletion in sulfate concentrations within 0.7<span class='thinspace'></span>m of sediment depths. This suggested the presence of methanotrophic archaea involved in sulfate-dependent AOM, albeit in a small amount. The ratio of <i>sn</i>-2-hydroxyarchaeol to archaeol (&gt;<span class='thinspace'></span>1) and operational taxonomic units (OTUs) indicated that the anaerobic methanotrophic archaea (ANME) clades ANME-2c and ANME-3 were involved in AOM. Higher <span class='inline-formula'><i>δ</i><sup>13</sup>C</span> values of archaeol and biphytanes (BPs; <span class='inline-formula'><math xmlns='http://www.w3.org/1998/Math/MathML' id='M6' display='inline' overflow='scroll' dspmath='mathml'><mrow><mo>-</mo><mn mathvariant='normal'>55.2</mn><mo>±</mo><mn mathvariant='normal'>10.0</mn></mrow></math><span><svg:svg xmlns:svg='http://www.w3.org/2000/svg' width='64pt' height='10pt' class='svg-formula' dspmath='mathimg' md5hash='b8a30afc3a6a907d1421600169c03687'><svg:image xmlns:xlink='http://www.w3.org/1999/xlink' xlink:href='bg-15-7419-2018-ie00001.svg' width='64pt' height='10pt' src='bg-15-7419-2018-ie00001.png'/></svg:svg></span></span><span class='thinspace'></span>‰ and <span class='inline-formula'><math xmlns='http://www.w3.org/1998/Math/MathML' id='M7' display='inline' overflow='scroll' dspmath='mathml'><mrow><mo>-</mo><mn mathvariant='normal'>39.3</mn><mo>±</mo><mn mathvariant='normal'>13.0</mn></mrow></math><span><svg:svg xmlns:svg='http://www.w3.org/2000/svg' width='64pt' height='10pt' class='svg-formula' dspmath='mathimg' md5hash='8ab88b064bf7877fe9242b053f754cf0'><svg:image xmlns:xlink='http://www.w3.org/1999/xlink' xlink:href='bg-15-7419-2018-ie00002.svg' width='64pt' height='10pt' src='bg-15-7419-2018-ie00002.png'/></svg:svg></span></span><span class='thinspace'></span>‰, respectively) suggested that archaeal communities were also assimilating AOM-derived inorganic carbon. Furthermore, the distinct distribution patterns of methanotrophs in the three MVs appears to be associated with varying intensities of ascending gas fluids. Consequently, our results suggest that the niche diversification of active mud volcanoes has shaped distinct archaeal communities that play important roles in AOM in the Beaufort Sea.</p> </P>
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