| Project/Area Number |
07836005
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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 | 時限 |
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| Research Field |
海洋生物学
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
SHIRAIWA Yoshihiro Niigata University Faculty of Science Associate Professor, 理学部, 助教授 (40126420)
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| Co-Investigator(Kenkyū-buntansha) |
ODANI Shoji Niigata University Faculty of Science Professor, 理学部, 教授 (60018702)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Calcification / CO_2 fixation / Foraminifera / Photosynthetic activity / Symbiodinium / Symbiotic algae isolated / 生育至適条件 / 光補償点 / CO_2親和性 / 酸素阻害 / 光合成特性 / 石灰化 / サンゴ |
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| Research Abstract |
Symbiotic algae have a very important role for the production of organic substances in invertebrates living in coral reef. Isolated symbiotic algae (Symbiodinium sp.) from Amphiscolops sp., Corculum cardisa, Pocilopora damicornis were used for the estimation of the photosynthetic ability. (1) An artificial seawater (Marine Art, Senju Pharmaceutical Co.Ltd.) enriched with a modified Erd-Schreiber's medium was useful for getting high growth rate. (2) Optimum temperature for the growth was 30ﾟC and no algal growth was observed blow 5ﾟC.(3) Photosyntheis saturated at 150 mumol/m^2/s and the light compensation point was 10 mumol/m^2/s. (4) Optimum pH was 6-8. (5) Determinations of the activities of photosynthesis and respiration, and change in pH of the medium in Foraminifera, Scleractinian coral Anthopora, and a green macrophyte Halimeda, which were performed in Palau, suggested that Foraminifera is possible to play an important role for the fixation and storage of CO_2. (6) Calcifying photosynthetic organisms are possible to be great CO_2 sink when those photosynthesis are fully active. (7) A new method for the separation and analyzes of strongly hydrophilic peptides using HPLC was developed for the analyzes of the metabolisms in symbiotic algal cells and host cells.
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