| 研究課題/領域番号 |
18KK0298
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| 研究機関 | 静岡大学 |
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研究代表者 |
CASARETO Beatriz 静岡大学, 創造科学技術大学院, 特任教授 (60402244)
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| 研究分担者 |
藤原 健智 静岡大学, 創造科学技術大学院, 教授 (80209121)
鈴木 利幸 静岡県立大学, 食品栄養科学部, 研究補助員 (80537283) [辞退]
天野 豊己 静岡大学, 理学部, 准教授 (90297945)
RAMPHUL CHITRA 静岡大学, 創造科学技術大学院, 研究員 (20832661) [辞退]
Aussanee Yamaguchi 静岡大学, 創造科学技術大学院, 研究員 (00830374)
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| 研究期間 (年度) |
2018-10-09 – 2023-03-31
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| キーワード | Mauritius / Super Coral / coral bleaching / oxidative stress / thermal tolerant / genome analysis / Symbiodiniaceae / physiological factor |
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| 研究実績の概要 |
This study aims to describe the physiological mechanisms that promote a successful response of thermally tolerant corals, which we define as
“super corals". We surveyed two target reefs: Albion (A) (shallow, human impacted) and Belle-Mare (BM) (deep, less affected). We sampled 17 and
19 coral colonies in A and BM respectively. Results from these studies showed that rather than in A, corals in BM were highly exposed to
stressful condition judging from the high allomer/Chl-a indicating oxidative stress condition of symbionts and the total holobiont affected
judging from the high gly/glu ratio in the tissues of corals from BM. Nevertheless these corals were successful in keeping high Fv/Fm with healthy zooxanthellae with high Chl-a/cell. High % of the bacterium Endozoicomonas in Pocillopora corals at BM confirmed their healthy condition. The presence of Symbiodiniaceae of Clade D (Genus Durusdinium) (thermal resistant) reinforced “super coral” features. In terms of coral species, Pocillopora eydouxi, Pavona sp and Montipora sp were the species classified as "super corals". We tested the selected "super corals" in incubations under stressful temperatures with a successful recovery. We published 2 scientific papers in collaboration with Mauritius researchers. We participated in 4 international and local symposia with oral and poster presentations performed by students and early career researchers
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Due to the covid-19 we were not able to trip to Mauritius planed in March of 2022, however we had developed a number of activities in
cooperation with the University of Mauritius: We developed 4 times on-line seminars for young researchers with about 20 participants each time.
Other on-line meetings were held for data analysis and planning. University of Mauritius researchers developed monitoring surveys at the 2 selected sites and obtained physico-chemical data using loggers and biological (Fv/Fm) data from previous identified super corals. Data are actually under analysis. We had also accomplished training and education of young scientists. We success in getting the UNESCO/K. Obuchi Young Researcher Fellowship to give training to a Mauritius PhD candidate at Shizuoka University from May to July 2022. We had prepared a joint report to fulfill the requirements for an RCA between Univ. of Mauritius and Shizuoka Univ. that also covers the requested report for coral sampling permits. We had published two joint papers in collaboration with
Mauritius scientists (Marine Pollution Bulletin, and African Journal of Marine Science). We participated in 4 local and international symposia including the 14th International Coral Reef Symposium (ICRS) Bremen, Germany 18-28 July 2021, and the 2nd BECoME Hong-Kong, January 3-7 2022.
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| 今後の研究の推進方策 |
We are expecting to be able to trip to Mauritius during this fiscal year since COVID-19 situation in Mauritius as well as Japan is improving. We plan to (a) Continuing surveys in the two selected reefs. (b) Evaluation of coral physiological responses using incubation under normal vs. stressful conditions of temperature and light with (3-4 days), and posterior recovery (4-6 days). Coral nubbins under normal (ambient) and stressful temperatures (plus 2 to 4 °C) and light (over 1500 micromol cm-2 sec-1) will be incubated to evaluate their responses in the reduction of oxidative stress and apoptosis,
defense against infections, feeding under normal or bleached conditions. We will test posterior recovery capacity, by placing the corals back to ambient conditions. Experiments will be done at the University of Mauritius (UoM) laboratory facilities. (c) We will hold the second workshop at
UoM. Finally we will create a summary with conclusions and recommendations:
(a) Create a first molecular genetic catalogue/database for Symbiodiniaceae from corals of Mauritius. (b) Summary of data with characterization of “super coral” and identification of such areas in Mauritius that can provide “super corals” for the future of African Reefs (c) Make relevant recommendations for inclusion of areas bearing “super corals” in Marine Protected Areas
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| 次年度使用額が生じた理由 |
Due to the spreading of corona-virus infection we could not trip to the Republic of Mauritius during the 2021 fiscal year, therefore we requested an extension to finalize the remaining surveys and experiments in Mauritius during the present fiscal year. We are expecting to be able to trip to Mauritius during the present fiscal year to finalize our research
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