| Project/Area Number |
25340060
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental impact assessment
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
ASAMI Ryuji 琉球大学, 理学部, 准教授 (00400242)
YASUMOTO Jun 琉球大学, 農学部, 助教 (70432870)
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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 |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | 堆積物コア / サンゴ礁生態系 / 人為影響 / 生態系長期変遷 / 有孔虫 |
|---|
| Outline of Final Research Achievements |
Coral reef ecosystems are now being threatened by global environmental changes and human impacts. However, it is still argued that when and how increasing human populations historically affect coral reef ecosystems. We conducted geochemical and micropaleontological analyses of sediment cores drilled from the reclaimed areas of Naha City (Okinawa Prefecture, Japan), where pristine coral reefs had been reclaimed. Results showed that Holocene sediments consisting mainly of bioclastic carbonate sand and mud increasingly contained terrigenous siliciclasts in the upper part of cores, and that some cores potentially record historical changes in terrigenous sediment inputs into coral reef environments, starting from periods of Gusuku and Ryukyu Kingdom.
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