The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Microbial Community Composition Associated with Anaerobic Oxidation of Methane in Gas Hydrate-Bearing Sediments in the Ulleung Basin, East Sea

동해 울릉분지 가스 하이드레이트 매장 지역의 메탄산화 미생물 군집 조성 및 분포

  • Cho, Hyeyoun (Department of Marine Sciences and Convergent Technology, Hanyang University) ;
  • Kim, Sung-Han (Department of Marine Sciences and Convergent Technology, Hanyang University) ;
  • Shin, Kyung-Hoon (Department of Marine Sciences and Convergent Technology, Hanyang University) ;
  • Bahk, Jang-Jun (Petroleum and Marine Resource Research Division, Korea Institute of Geoscience and Mineral Resource) ;
  • Hyun, Jung-Ho (Department of Marine Sciences and Convergent Technology, Hanyang University)
  • 조혜연 (한양대학교 해양융합과학과) ;
  • 김성한 (한양대학교 해양융합과학과) ;
  • 신경훈 (한양대학교 해양융합과학과) ;
  • 박장준 (한국지질자원연구원 석유해저연구본부) ;
  • 현정호 (한양대학교 해양융합과학과)
  • Received : 2014.10.28
  • Accepted : 2015.02.04
  • Published : 2015.02.28
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Abstract

To elucidate the microbial consortia responsible for the anaerobic methane oxidation in the methane hydrate bearing sediments, we compared the geochemical constituents of the sediment, the rate of sulfate reduction, and microbial biomass and diversity using an analysis of functional genes associated with the anaerobic methane oxidation and sulfate reduction between chimney site (UBGH2-3) on the continental slope and non-chimney site (UBGH2-10) on the basin of the Ulleung Basin. From the vertical profiles of geochemical constituents, sulfate and methane transition zone (SMTZ) was clearly defined between 0.5 and 1.5 mbsf (meters below seafloor) in the UBGH2-3, and between 6 and 7 mbsf at the UBGH2-10. At the UBGH2-3, the sulfate reduction rate (SRR) in the SMTZ exhibited was appeared to be $1.82nmol\;cm^{-3}d^{-1}$ at the depth of 1.15 mbsf. The SRR in the UBHG2-10 showed a highest value ($4.29nmol\;cm^{-3}d^{-1}$) at the SMTZ. The 16S rRNA gene copy numbers of total Prokaryotes, mcrA, (methyl coenzyme M reductase subunit A), and dsrA (dissimilatory sulfite reductase subunit A) showed the peaks in the SMTZ at both sites, but the maximum mcrA gene copy number of the UBGH2-10 appeared below the SMTZ (9.8 mbsf). ANME-1 was a predominant ANME (Anaerobic MEthanotroph) group in both SMTZs of the UBGH2-3 and -10. However, The sequences of ANME-2 were detected only at 2.2 mbsf of the UBGH2-3 where high methane flux was observed because of massive amount of gas hydrate at shallow depth. And Desulfosarcina-Desulfococcus (DSS) that is associated with ANME-2 was detected in 2.2 mbsf of the UBHG2-3. Overall results demonstrate that ANME-1 and ANME-2 are considered as significant archaeal groups related to methane cycle in the subsurface sediment of the East Sea, and ANME-2/DSS consortia might be more responsible for methane oxidation in the methane seeping region than in non-seeping region.

동해 울릉 분지 내 메탄 하이드레이트가 매장된 지역에서 혐기적 메탄 산화와 연관된 미생물 군집 특성을 이해하기 위해 메탄 누출이 있는 대륙사면 정점(UBGH2-3)과 메탄 누출이 없는 분지 정점(UBGH2-10)에서, (1) 퇴적물의 지화학적 성분 및 황산염 환원율을 측정하였으며, (2) 기능성 유전자 분석을 통해 혐기적 메탄 산화 미생물 및 황산염 환원 미생물 군집의 정량 및 다양성 분석을 수행하여 그 결과를 비교하였다. 황산염-메탄 전이지대(sulfate and methane transition zone, SMTZ)는 UBGH2-3에서 0.5~1.5 mbsf (meters below seafloor), 그리고 UBGH2-10에서는 6~7 mbsf에 분포하는 것으로 나타났다. 두 지역의 SMTZ에서 측정된 황산염 환원율은 UBGH2-3의 1.15 mbsf에서 $1.82nmol\;cm^{-3}d^{-1}$으로 나타났고, UBGH2-10의 SMTZ에서 황산염 환원율은 $4.29nmol\;cm^{-3}d^{-1}$으로 높은 값을 보였다. 총 미생물 16S rRNA gene과 기능성 유전자인 mcrA (methyl coenzyme M reductase subunit A) 및 dsrA (dissimilatory sulfite reductase subunit A)의 정량 PCR 결과 두 정점의 SMTZ 부근에서 상대적으로 높게 검출되었다. 그러나 UBGH2-10지역에서 mcrA 유전자는 SMTZ 아래인 9.8 bmsf에서 가장 높게 검출되었다. mcrA 유전자의 다양성 분석 결과 두 지역의 SMTZ와 그 아래 퇴적층에서 혐기성 메탄산화 고세균(ANME: Anaerobic MEthanothoph) 군집인 ANME-1이 우점하였다. 한편, ANME-2 군집은 메탄 누출이 발생하는 UBGH2-3지역의 2.2 mbsf 층에서만 관찰되었고, 더불어 dsr 유전자 다양성 분석 결과 ANME-2와 컨소시엄을 이루는 Desulfosarcina-Desulfococcus (DSS) 이 나타났다. 본 연구 결과, ANME-1과 ANME-2은 동해 심부 퇴적 환경에서 혐기적 메탄 산화 및 생성 과정에 관여하는 중요한 고세균 군집으로 사료되며, 또한 ANME-2/DSS 컨소시엄은 메탄이 누출되는 지역인 UBGH2-3과 같이 혐기적 메탄 산화가 활발한 곳에서 메탄 거동을 조절하는 중요한 미생물 그룹으로 인식된다.

Keywords

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