| Project/Area Number |
25291101
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Ecology/Environment
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| Research Institution | Research Institute for Humanity and Nature (2014-2015)
Kyoto University (2013) |
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Principal Investigator |
Tayasu Ichiro 総合地球環境学研究所, 研究高度化支援センター, 教授 (80353449)
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| Co-Investigator(Kenkyū-buntansha) |
KONDOH Michio 龍谷大学, 理工学部, 教授 (30388160)
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| Co-Investigator(Renkei-kenkyūsha) |
OHKOUCHI Naohiko 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, 分野長 (00281832)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2013: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | 安定同位体 / 生態系 / アミノ酸 / 生物標本 / 食物網 |
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| Outline of Final Research Achievements |
In this study, we tested a possibility to use molecular level isotope techniques and other isotopes together with conventional isotopes, namely carbon and nitrogen isotope ratios.
It had been shown that trophic position of an organism can be estimated using nitrogen isotope ratios of phenylalanine and glutamine in either terrestrial or aquatic ecosystem. However, the equation to estimate trophic position requires an assumption of either terrestrial or aquatic primary production. In this study, we revealed that the method is also available to an organism in riverine systems, applying a mixing model using nitrogen isotope ratios of phenylalanine and glutamine.
We showed the utility to use sulfur isotope ratios in separating terrestrial and marine derived materials, oxygen isotope ratios of organic matter in estimating the origin of the materials in relation to water cycling, and carbon-14 concentrations in estimating carbon source.
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