Quantitative and qualitative changes in dissolved organic matter and bacteria in Lake Biwa
| Project/Area Number |
23370010
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HAYAKAWA Kazuhide 滋賀県琵琶湖環境科学研究センター, 主任研究員 (80291178)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2011: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
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| Keywords | 溶存有機物 / 植物プランクトン / 浮遊細菌 / 化学組成 / 遺伝系統解析 |
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| Research Abstract |
We have clarified the microbial processes below: In the epilimnion of Lake Biwa during the stratified period, phytoplankton produce protein-like dissolved organic matter (DOM), and the DOM is converted into humic-like DOM through decomposition by planktonic bacteria. The humic-like DOM is transported to the hypolimnion through winter vertical mixing. In the hypolimnion during the stratified period, only one bacterial species, CL500-11 (phylum Chloroflexi), predominates, and bacterivorous Kinetoplastid flagellates also dominate. So, in the hypolimnion of Lake Biwa during the stratified period, there may be the unique microbial food webs where humic-like DOM is consumed by bacterial assemblages predominated by CL500-11, and where those bacteria are grazed by bacterivorous protists such as Kinetoplastids.
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Report
(4 results)
Research Products
(45 results)
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[Presentation] Long-term changes in the concentrations of nutrients and water quality parameters in Lake Biwa using integrated analysis from several monitoring data2012
Author(s)
Hayakawa, K., S. Tsujimura, T. Ishikawa, H. Haga, T. Okamoto, C. Jiao, K. Ishikawa, M. Kumagai
Organizer
Association for Sciences of Limnology and Oceanography Aquatic Sciences Meeting 2012
Place of Presentation
コラボしが, 大津市, 滋賀県
Year and Date
2012-07-09
Related Report
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[Presentation] Biogeochemical control on fluorescent dissolved organic matter in a large freshwater lake (Lake Biwa, Japan)2012
Author(s)
Thottathil, D. S., Hayakawa, K., Hodoki, Y., Yoshimizu, C., Kobayashi, Y., Nakano, S.
Organizer
ASLO Aquatic Science Meeting
Place of Presentation
Otsu, Shiga, Japan
Related Report
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[Presentation] Long-term changes in the concentrations of nutrients and water quality parameters in Lake Biwa using integrated analysis from several monitoring data2012
Author(s)
Hayakawa, K., Tsujimura, S., Ishikawa, T., Haga, H., Okamoto, T., Jiao, C., Ishikawa, K., Kumagai, M.
Organizer
ASLO Aquatic Science Meeting
Place of Presentation
Otsu, Shiga, Japan
Related Report
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