| Project/Area Number |
17510013
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
ARAKAKI Takemitsu University of the Ryukyus, Faculty of Science, Associate Professor, 理学部, 助教授 (80343375)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Coral / Bleaching / Hydrogen peroxide / Metabolism / Active oxygen species / Okinawa |
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| Research Abstract |
Coral metabolism can be used as an indicator for physiological conditions of a coral colony. We studied coral metabolism using a Continuous Flow Complete Mixing (CFCM) experimental system. The CFCM experimental system is a newly developed experimental system for quantitative investigation of corals' metabolic changes. Coral incubation conditions tested were: 1) no addition of hydrogen peroxide (H_2O_2) to the supplied seawater (H_20_2 0 μM for 12 days) and 2) addition of various concentrations of H_2O_2 to the supplied seawater (0, 0.3, 3 and 30 μM H_2O_2 for 3 days each). With no addition of H_2O_2, the coral metabolisms (photosynthesis and calcification) were relatively stable, and we did not find any significant metabolic changes. The results suggested that when H_2O_2 was not added to the CFCM system, the coral did no suffer significant stress from the experimental system over a 12-day incubation period. When H_2O_2 concentrations were increased, large decreases in photosynthesis and calcification were observed. We found statistically significant differences in the photosynthesis rates between 0 nM and 3000, and 30000 nM H_2O_2. Additionally, we found statistically significant differences in the calcification rates between 0 and 30000 nM H_2O_2. Thus, incubation experiment we conduced suggested that higher H_2O_2 concentrations clearly influenced coral metabolisms.
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