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Variations in archaeal and bacterial diversity associated with the anaerobic oxidation of methane in the active mud volcanoes of the Canadian Beaufort Sea

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Title
Variations in archaeal and bacterial diversity associated with the anaerobic oxidation of methane in the active mud volcanoes of the Canadian Beaufort Sea
Other Titles
캐나다 버포트해내 머드 볼케이노에서 메탄의 혐기적 산화와 관련된 고세균과 세균 다양성
Authors
Lee, Yung Mi
Hong, Soon Gyu
Hwang, Kyuin
Lee, Dong-Hun
Jin, Young Keun
Keywords
Canadian Beaufort Sea; Diversity; Methane
Issue Date
2016
Citation
Lee, Yung Mi, et al. 2016. Variations in archaeal and bacterial diversity associated with the anaerobic oxidation of methane in the active mud volcanoes of the Canadian Beaufort Sea. American Geophysical Union 2016 Fall Meeting. 샌프란시스코. 2016.12.12~2016.12.16.
Abstract
The prokaryotic microorganisms inhabiting Mud Volcanoes (MVs) play an important role for mitigation of methane (CH4) emission. Despite the identification of active MVs in the continental slope of the Canadian Beaufort Sea, little is known about the distribution and functions of prokaryotic community in this region. Hence, we investigated the prokaryotic diversity of four sediment cores (three from the active MVs and one from a non-methane influenced reference site) of the Canadian Beaufort Sea using 454-pyrosequencing of 16S rRNA genes as the first step to understand the prokaryotic roles in controlling outgassing methane. Bacterial and archaeal communities of MVs were distinctive from those of the reference site, and the communities of MVs were similar to each other at deeper depth levels. Chloroflexi, Actinobacteria, unclassified bacterial groups, and MCG_c of Crenarchaeota were predominant in the MVs, while Firmicutes, Deltaproteobacteria, and unclassified class of Thaumarchaeota were dominant in reference site. The relative abundance of dominant bacterial groups varied at sulfate-methane transition zone (SMTZ) of individual MVs. However, certain microbial taxa such as members of SAGMEG_o or Methanosarcinales of Euryarcheaota and Dehalococcoidales of Chloroflexi were predominant at SMTZs. Since they are not the classical representative taxa known to be involved in anaerobic oxidation of methane, their dominance implicates that they could be playing important roles in methane cycling using unrevealed mechanisms. We will further perform the phylogenetic and network analyses to infer mechanisms and interactions of dominant operational taxonomic units in controlling methane flux.
URI
http://repository.kopri.re.kr/handle/201206/7171
Conference Name
American Geophysical Union 2016 Fall Meeting
Conference Place
샌프란시스코
Conference Date
2016.12.12~2016.12.16
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