Dynamic evaluation of boreal aquatic ecosystems assessed by nitrogen isotope and food web structure
Project/Area Number |
21340163
|
Research Category |
Grant-in-Aid for Scientific Research (B)
|
Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Geochemistry/Astrochemistry
|
Research Institution | Hokkaido University |
Principal Investigator |
MINAGAWA Masao 北海道大学, 大学院・地球環境科学研究院, 教授 (10250507)
|
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)
|
Project Period (FY) |
2009 – 2011
|
Project Status |
Completed (Fiscal Year 2011)
|
Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2010: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2009: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
|
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 / 窒素同位体 / 食物連鎖 / 移入動物 / 栄養段階 / 水圏生態系 / 河川水系 / 富栄養化 / 窒素収支 / 富山 |
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.
|
Report
(4 results)
Research Products
(44 results)