2010 Fiscal Year Final Research Report
Effects of nitrogen : phosphorus ratios on the interspecific competition of phytoplankton communities
| Project/Area Number |
19510038
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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 |
Environmental impact assessment/Environmental policy
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| Research Institution | Lake Biwa Environmental Research Institute |
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Principal Investigator |
TSUJIMURA Shigeo Lake Biwa Environmental Research Institute, 総合解析部門, 専門研究員 (60300969)
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| Project Period (FY) |
2007 – 2010
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| Keywords | 生態系影響評価 / 湖沼生態 / 植物プランクトン |
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| Research Abstract |
The limited ratio of nitrogen (N) to phosphorus (P) was investigated for some phytoplankton species and was compared with the N:P ratio of nutrient-sufficient cells. Since the intercellular phosphorus reserves are much more than those of nitrogen, the limited N:P ratio was much larger than the Redfield ratio which is used to infer the nutrient limitation. Therefore it is suggested that phytoplankton are affected by N limitation more than we have assumed it so far. There was a difference in the supply pattern of dissolved phosphorus and nitrogen in the South Basin of Lake Biwa, resulted in the fluctuation of the supply N:P ratio. This seems to be influenced the species composition and the dominance in phytoplankton.
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