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2007 Fiscal Year Final Research Report Summary

Analysis of the microbial food web in a wetland soil diiven by methane oxidation

Research Project

Project/Area Number 18570017
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Ecology/Environment
Research InstitutionNagoya University

Principal Investigator

MURASE Jun  Nagoya University, Graduate School of Bioagricultural Sciences, Associate Professor (30285241)

Project Period (FY) 2006 – 2007
KeywordsMethane oxidation / Methanotrophs / Microbial food web / Protozoa / Rice field soil / Selective grazing / Stable isotope probing / flagellate
Research Abstract

Biological methane oxidation at the oxic-anoxic interface in wetland soils and sediments is a key process in methane cycle, preventing large amounts of this greenhouse gas to escape into the atmosphere. A specific group of aerobic bacteria oxidises methane and is also able to assimilate methane-C. In limnic ecosystems, MOB (methane oxidising bacteria) are responsible for most of the methane oxidation, and they are also important in the surface layer of marine sediments. However, the fate of methanotrophic biomass is largely unknown. We demonstrate that an entire microbial food web can be driven by methane. Soil microcosms, in which a thin layer of water-saturated rice field soil was incubated under opposing gradients of oxygen and ^ (13) C-labelled methane, revealed ^ (13) C-enriched "heavy" RNA which could be affiliated to MOB, to the scavenging prokaryotic Myxobacteria, and to protistan grazers including amoebae, ciliates, and flagellates. Different protistan communities developed depending on methane concentrations. Protists isolated from the soil demonstrated selective grazing on MOB. Recent work using MOB as a model has shown that microbial community structure matters for ecosystem functioning. The results suggest that not only microbial, but also protistan diversity and microbe-protist interactions have to be considered.

  • Research Products

    (11 results)

All 2007 2006

All Journal Article (4 results) (of which Peer Reviewed: 2 results) Presentation (6 results) Book (1 results)

  • [Journal Article] A methane-driven microbial food web in a wetland rice soil2007

    • Author(s)
      Murase, J. and Frenzel, P.
    • Journal Title

      Environmental Microbiology 9

      Pages: 3025-3034

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] A methane-driven microbial food web in a wetland rice soil2007

    • Author(s)
      Murase, J., Frenzel, P
    • Journal Title

      Environ. Microbiol 9

      Pages: 3025-3034

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The impact of protists on activity and structure of the bacterial community in a rice field soil.2006

    • Author(s)
      Murase, J., Nol1, M., and Frenzel, P.
    • Journal Title

      Applied and Environmental Microbiology 72

      Pages: 5436-5444

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Impact of protists on activity and structure of the bacterial community in a rice field soil2006

    • Author(s)
      Murase. J., M. Frenzel, P
    • Journal Title

      Appl. Environ. Microbial 72

      Pages: 5436-5444

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Selective grazing of free-living naked amoeba on methane-oxidizing bacteria.2007

    • Author(s)
      Murase, J., Frenzel, P.
    • Organizer
      XIIth International Meeting on the Biology and Pathogenicity of Free-Living Amoebae
    • Place of Presentation
      和光
    • Year and Date
      20070827-30
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Selective grazing of free-living naked amoeba on methane-oxidizing bacteria2007

    • Author(s)
      Murase, J., Frenzel, P
    • Organizer
      XIIth International Meeting on the Biology and Pathogenicity of Free-Living Amoebae
    • Place of Presentation
      Wako
    • Year and Date
      20070827-30
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] The methanotrophic microbial food chain in a rice field soil.2007

    • Author(s)
      Murase, J., Frenzel, P.
    • Organizer
      The 10th International Symposium on Wetland Biogeochemistry
    • Place of Presentation
      アナポリス
    • Year and Date
      20070401-04
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] The methanotrophic microbial food chain in a rice field soil2007

    • Author(s)
      Murase, J., Frenzel, P
    • Organizer
      The 10th International Symposium on Wetland Biogeochemistry
    • Place of Presentation
      Annapolis
    • Year and Date
      20070401-04
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] A microbial food web in a rice field soil driven by methane oxidation.2006

    • Author(s)
      Murase, J. and Frenzel, P.
    • Organizer
      The 11th International Symposium on Microbial Ecology
    • Place of Presentation
      ウィーン
    • Year and Date
      20060820-25
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] A microbial food web in a rice field soil driven by methane oxidation2006

    • Author(s)
      Murase, J., Frenzel, P
    • Organizer
      The 11th International Symposium on Microbial Ecology
    • Place of Presentation
      Viena
    • Year and Date
      20060820-25
    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] 地球環境と生態系2006

    • Author(s)
      村瀬 潤・杉本敦子(分担執筆)
    • Total Pages
      282
    • Publisher
      共立出版
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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