2003 Fiscal Year Final Research Report Summary
Biocomplexity of the interactions of complex organic colloids and microbial communities in aquatic environments
| Project/Area Number |
13308029
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
NAGATA Toshi Kyoto University, Center for Ecological Research, Professor, 生態学研究センター, 教授 (40183892)
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| Co-Investigator(Kenkyū-buntansha) |
KOIKE Isao The University of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (30107453)
KAWABATA Zenichiro Kyoto University, Center for Ecological Research, Professor, 生態学研究センター, 教授 (80108456)
WADA Eitaro Research Institute for Humanity and Nature, Professor, 教授 (40013578)
OGAWA Hiroshi The University of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所, 助教授 (50260518)
KOGURE Kazuhiro The University of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (10161895)
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| Project Period (FY) |
2001 – 2003
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| Keywords | Dissolved organic matter / Marine colloids / Bacterial community / Organic matter degradation / Marine ecosystem / Biocomplexity / Microbial loop / Material cycling |
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| Research Abstract |
Dissolved and colloidal organic matter (DOM and COM) represents the largest reservoir of organic carbon in the oceans and play a substantial role in global cycling of carbon. In the present project, we were aimed at examining degradation of complex organic polymers in seawater and regulation mechanisms of bacterial communities in estuarine and coastal environments. We succeeded in developing a novel tracer technique to analyze transformation and degradation of complex organic polymers in seawater. Results showed that peptidoglycan, an important component of marine COM, is degraded more slowly than proteins, suggesting that complex polymers play a role in preservation of organic matter. Single-cell detection methods were used to investigate community dynamics and regulation of bacterial communities, which are responsible for degradation of DOM and COM. We found that bacterial community composition varies depending on substrate (DOM) supply, but the major flux of DOM and COM is generally driven by a limited number of bacterial groups such as alpha proteobacteria cluster. These results have implications for better modeling the biocomplex system consisting of DOC, COC and microbial communities.
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