泥火山を含む冷湧水帯における微生物の生態系およびその代謝活動 Microbial Ecology and Metabolisms in Methane-seep Sites Related to Mud Volcanoes

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著者

    • 宮崎 淳一 MIYAZAKI Junichi
    • 独立行政法人海洋研究開発機構 海洋・極限環境生命圏領域 深海・地殻内生物圏研究プログラム 深海・地殻内生命圏システム研究プロジェクト兼任プレカンブリアンエコシステムラボラトリー Subsurface Geobiology Advanced Research (SUGAR) Team, Extremobiosphere Research Program, Institute of Biogeosciences & Precambrian Ecosystem Laboratory, Japan Agency for Marine-Earth Science & Technology (JAMSTEC)

抄録

 There have been many studies on the microbial ecology in methane-seep sites related to mud volcanoes. This microbial ecosystem is supported by chemosynthetic microorganisms which depend on not on sunlight but on high-flux methane and sulfate.<br> In the subseafloor at the methane-seep sites, anoxic methane oxidation (AOM) occurs in the mixing zone of methane and sulfate. The primary microorganisms causing AOM are anaerobic methanotrophic archaea (ANME) and sulfate-reducing <i>δ-proteobacteria</i> (SRB). It is known that there are three groups of ANME (ANME-1, ANME-2, ANME-3) in deep-sea environments. These ANMEs are taxonomically related to known methanogens. ANME-2 and ANME-3 form symbiotic consortia with SRB, while ANME-1 does not form the symbiotic consortia. However, none of these microorganisms has been isolated yet. Therefore, details about ANMEs such as energy-metabolisms are still unknown. However, information about these microorganisms has recently been collected by the culture-independent analyses, such as metagenomic analysis. From these analyses, it has been proposed that ANME performed AOM by reverse-methanogenesis that proceeded in the opposite direction of known methanogenesis by methanogens.<br> Hydrogen sulfide is produced through AOM. This supports other ecosystems at the sediment surface. At the sediment surface, H<sub>2</sub>S supports H<sub>2</sub>S-oxidizing microorganisms. There are also invertebrates including mussels, clams and tubeworms which harbor chemosynthetic bacteria in their bodies to gain organic compounds.<br> Here, I introduce the activities of microorganisms and invertebrates living at methane-seep sites related to mud volcanoes.

収録刊行物

  • 地學雜誌

    地學雜誌 118(3), 564-577, 2009-07-07

    公益社団法人 東京地学協会

参考文献:  28件中 1-28件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10030365901
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    0022135X
  • NDL 記事登録ID
    10386747
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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