| Project/Area Number |
24570033
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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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| Research Field |
Ecology/Environment
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| Research Institution | Chukyo University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Yoichi 広島大学, 大学院生物圏科学研究科, 教授 (70309946)
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| Co-Investigator(Renkei-kenkyūsha) |
SUNOBE Tomoki 東京海洋大学, 水圏科学フィールド教育研究センター館山ステーション, 准教授 (00250142)
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| Research Collaborator |
KADOTA Tatsuru
SUZUKI Shohei
OGISO Keita
SAKANOUE Rei
SASAKI Tsukasa
SAKAIDA Sachiko
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| Project Period (FY) |
2012-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 逆方向性転換 / 双方向性転換 / 配偶システム / 野外除去実験 / 水槽内同居実験 / 独身雄 / サンゴ礁魚類 |
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| Outline of Final Research Achievements |
Sex change from male to female or from female to male occurs in some fishes. Moreover, reversed sex change or bi-directional sex change within a species has been reported in a part of them. To test the low-density hypothesis for the evolution of reversed sex change, we conducted mate-removal experiments in the field and aquarium experiments forcing cohabitation of males or females in species of various mating systems. Our results seem to support the hypothesis that in the low-density conditions of polygynous species, widowed males will change sex to acquire a new mate avoiding the risk of movement.
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