2011 Fiscal Year Final Research Report
Dynamic evaluation of boreal aquatic ecosystems assessed by nitrogen isotope and food web structure
| Project/Area Number |
21340163
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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 |
Geochemistry/Astrochemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
MINAGAWA Masao 北海道大学, 大学院・地球環境科学研究院, 教授 (10250507)
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| Co-Investigator(Kenkyū-buntansha) |
NODA Takashi 北海道大学, 大学院・地球環境科学研究院, 准教授 (90240639)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 窒素循環 / 脱窒 / 窒素安定同位体 / 食物網 / 石狩川 / 湖沼 / オオクチバス / 生態撹乱生物 |
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| Research Abstract |
To evaluate stability of aquatic ecosystems which are disturbed by interference such as by immigrant biota or by eutrophication, we studied and evaluated here stable nitrogen isotope proxies as a likely indicator assessing the state of nitrogen cycling and food chain structure of an ecosystem. Based on field works at Ishikari river water shed where it has been concerned about large discharge of anthropogenic nitrogenous compounds, and many dam ponds distributed in Toyama prefecture as being concerned about ecological disturbance by large-mouth bass recently. The nitrogen isotope analysis has been clarified as a useful and promising indicator to evaluate environmental problems occurring in ecology and/or nutrient cycling even though based on only snapshot observations.
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