| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
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| Outline of Final Research Achievements |
The aim of this study was to understand the structure of coastal ecosystems using radiocarbon (Δ14C) and amino acid nitrogen isotopic compositions (δ15N). First, the research methodology was established. Second, we showed that the dissolved organic matter in streams is a mixture of organic carbons with different turnover times. Third, we discussed the utility of Δ14C as a proxy of carbon cycling. Furthermore, Δ14C and amino acid δ15N were combined and applied for off Sanriku ecosystems, where a variety of fish communities is supported by a mixture of diet sources derived from different ocean currents. We also revealed that the integrated trophic position (iTP) of marine mesozooplankton communities was negatively correlated with species diversity.
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