2007 Fiscal Year Final Research Report Summary
Analysis of the microbial food web in a wetland soil diiven by methane oxidation
| Project/Area Number |
18570017
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Ecology/Environment
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| Research Institution | Nagoya University |
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Principal Investigator |
MURASE Jun Nagoya University, Graduate School of Bioagricultural Sciences, Associate Professor (30285241)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Methane oxidation / Methanotrophs / Microbial food web / Protozoa / Rice field soil / Selective grazing / Stable isotope probing / flagellate |
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| 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.
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[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
