2023 Fiscal Year Final Research Report
Are symbiotic relationships with zooxanthellae recorded in coral fossils?
| Project/Area Number |
21K14032
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 17050:Biogeosciences-related
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 無藻性イシサンゴ / 概日リズム / ライブイメージング / バイオミネラリゼーション / 炭酸カルシウム |
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| Outline of Final Research Achievements |
In this study, I monitored the behavior of the soft body parts of 14 individuals of two genera and three species of the asexual solitary coral family Flabellidae, and conducted rearing experiments to clarify the circadian rhythms of the organisms. Chi-2 periodogram analysis of soft parts behavior revealed an approximate 24-hour circadian rhythm in both LD and DD individuals. Analysis of skeletal growth patterns revealed specific daily calcification sites in deep-sea corals, such as concentric arcs of septal growth, which were not uniform, but occurred in spots. It is possible that the endogenous autonomous oscillations observed in this soft-body behavior experiment are directly related to the periodicity of skeletal development.
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| Free Research Field |
進化古生物
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| Academic Significance and Societal Importance of the Research Achievements |
古生物学・鉱物結晶学的な視点だけでなく，それらと独立的に行われてきた分子生物学，時間生物学，細胞学などの方法論を取り入れた無藻性サンゴの体系的な研究によって，細胞活動の概日リズムに相当する短時間スケールの「石灰化プロセス」とそれらの「周期構造形成様式」の解明し，サンゴ骨格のバイオミネラリゼーションと古環境指標の新たな意義を提示する．
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