2022 Fiscal Year Final Research Report
Studies on mating system and plasticity of sexual pattern in a fish of group living
| Project/Area Number |
20K06823
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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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| Review Section |
Basic Section 45040:Ecology and environment-related
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| Research Institution | Tokyo University of Marine Science and Technology |
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Principal Investigator |
Sunobe Tomoki 東京海洋大学, 学術研究院, 教授 (00250142)
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| Co-Investigator(Kenkyū-buntansha) |
久米 元 鹿児島大学, 農水産獣医学域水産学系, 准教授 (00554263)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 性転換 / 配偶システム / 性比 / 雌性先熟 / ハタ科 / アカオビハナダイ |
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| Outline of Final Research Achievements |
In fishes exhibiting polygyny which a lager male mates with smaller females, female changes sex to male by alteration of social dominance. However, it is predicted that a primary male appears in the condition of high density which dominant male can not control sex of females. Pseudoanthias rubrizonatus (Serranidae) was a species of group living, and exhibited polygynous mating system. The males exhibited courtship behavior in spite of non-spawning season, that may prevent female from sex change. In the group of 100 individuals (sex ratio; male : female = 1 : 5), all newly settled juveniles matured firstly as female by growing and later change sex to secondary male, while the primary males appeared in the group about 10,000 individuals. Because sex ratio of this large group was 1 : 7, the effect of courtship may be diluted.
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| Free Research Field |
魚類行動生態学
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| Academic Significance and Societal Importance of the Research Achievements |
魚類では生息密度の異なる個体群間で，性様式に違いがあることがいくつかの種で知られていた．本研究における群れを形成する魚類の性様式が，同じ個体群でも群れの大きさによって異なることが示されたことは学術的に大きな意義がある．本研究で得られた成果は，雌雄同体現象を示す有用魚種の性をコントロールする上で重要な知見となるものである．
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