| Project/Area Number |
21770020
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Ecology/Environment
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| Research Institution | Kochi University (2011)
Hokkaido University (2009-2010) |
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Principal Investigator |
KATO Motomi 高知大学, 教育研究部・総合科学系, 助教 (60403854)
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| Research Collaborator |
ERIK Jeppesen デンマーク国立環境研究所, 生物科学部, 研究部教授
LONE Liboriussen デンマーク国立環境研究所, 生物科学部, プロジェクト研究員
YVONNE Vadeboncoeur アメリカ合衆国オハイオ州立ライト大学, 生物学科, 准教授
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2011: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 環境 / 生態系 / 湖沼 / レジームシフト / 生態学 |
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| Research Abstract |
I developed a model of benthic(periphyton) and planktonic(phytoplankton) primary production using parameters derived from a shallow macrophyte-free lake that shifted from a turbid to a clear-water state following fish removal. Scenarios incorporating a gradient of external P loading rates revealed that : 1) periphyton and phytoplankton both contributed substantially to whole-lake production over a broad range of external P loading in a clear-water state ; 2) during the clear-water state, the loss of benthic production was gradually replaced by phytoplankton production, leaving whole-lake production largely unchanged. The model suggests a mechanism for the persistence of alternative states in shallow macrophyte-free lakes and demonstrates that regime shifts may trigger profound changes in ecosystem structure and function.
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