| Project/Area Number |
15405011
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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 | 海外学術 |
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| Research Field |
Ecology/Environment
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| Research Institution | Ryukoku University (2005)
Kyoto University (2003-2004) |
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Principal Investigator |
YUMA Masahide Ryukoku University, Faculty of Science and Technology, Professor, 理工学部, 教授 (80240828)
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| Co-Investigator(Kenkyū-buntansha) |
KAWABATA Zen-ichiro Ryukoku University, Research Institute for Humanity and Nature, Professor, 教授 (80108456)
NOZAKI Kentaro Sugiyama Jogakuen University, School of Human Sciences, Lecturer, 人間関係学部, 講師 (90350967)
MARUYAMA Atsushi Ryukoku University, Faculty of Science and Technology, Research Associate, 理工学部, 助手 (70368033)
奥田 昇 京都大学, 生態学研究センター, 助教授 (30380281)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥14,200,000 (Direct Cost: ¥14,200,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2004: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 2003: ¥6,500,000 (Direct Cost: ¥6,500,000)
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| Keywords | Lake Baikal / Lake Biwa / Lake Malawi / Littoral bottom / Grazing-food-chain / Detritus-food-chain |
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| Research Abstract |
Comparison of grazing- and detritus-food-chains on the littoral bottom in boreal Lake Baikal, temperate Lake Biwa, and tropical Lakes Malawi was carried out from 2003 to 2005 by the underwater experiment to test a hypothesis on the bottom-up constraint influencing the evolutionary development of high biodiversities in these lakes. The bottom-up constraint may be prominent where the abundance of benthic organisms in the grazing-food-chain is restricted by a seasonally lowest production, referring chiefly to attached algae, and large fluctuations in the abundance of primary producers provide a resource that is eventually utilized by benthic organisms of the detritus-food-chain. This hypotheses help to explain, for the lakes we cite, the facts that diverse grazing-food-chain organisms live on the littoral bottom of tropical lakes where there is relatively constant large algal production due to suitable conditions of water temperature and light penetration through the year ; while on the other hand, detritus-food-chain organisms are predominant on the littoral bottom of a boreal lake with seasonally fluctuating algal production and its pronounced lowest production in a year. The results based on the field surveys (measurement of DO based primary production and respiration, benthic animal community and their food, amount of detritus) during in the term of this project practically verify above hypothesis.
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