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KMID : 0364820140500030191
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Korean Journal of Microbiology
2014 Volume.50 No. 3 p.191 ~ p.200
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Characteristics of Microbial Community Structures of the Methane Hydrate Sediments in the Ulleung Basin, East Sea of Korea
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Shin Ji-Hye
Nam Ji-Hyun
Lee Jin-Woo
Lee Dong-Hun
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Abstract
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Gas hydrates play a significant role in the global carbon cycle and climate change because methane, a greenhouse
gas, can be released from the dissociation of gas hydrate. Anaerobic oxidation of methane (AOM) is an important
process that consumes more than 90% of the methane released into the hydrosphere and atmosphere. In this study,
the microbial community associated with the methane gas hydrate sediment in the Ulleung basin, East Sea of Korea
(UBGH) was analyzed by phylogenetic analysis of the mcrA and 16S rRNA gene libraries. A vertical stratification of
the dominating anaerobic methane oxidizer (ANME)-1 group was observed at the surface and the sulfate methane
transition zone (SMTZ). The ANME-2c group was found to be dominant in the high methane layer. The archaea of
marine benthic group B, which is commonly observed in the AOM region, accounted for more than 50% of the
identifications in all sediments. Nitrate reducing bacteria were predominant at SMTZ (Halomonas: 56.5%) and high
methane layer (Achromobacter: 52.6%), while sulfate reducing bacteria were not found in UBGH sediments. These
results suggest that the AOM process may be carried out by a syntrophic consortium of ANME and nitrate reducing
bacteria in the gas hydrates of the Ulleung Basin of the East Sea.
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KEYWORD
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anaerobic oxidation of methane, East Sea, methane hydrate, nitrate reducing bacteria, Ulleung basin
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