| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Sex steroid hormone is an important mediator of many social and sexual behaviors in vertebrates and its circulating levels can influence fitness via hormone-mediated phenotypes. The previous studies strongly suggested that male androgen levels are under strong direct selection, and that males with high levels of androgen enjoy a selective advantage in terms of increased reproductive success. To address this prediction, I used natural variation in androgen-mediated traits between different ecotype populations of the Japanese threespined stickleback as a model system. In this study, I elucidated that there is adaptive population divergence of male androgen production in relation to mating system in nature and the presence of androgen-dependent reproductive cost may constrain evolution of high androgen levels and drive evolutionary divergence in androgen levels in relation to breeding system.
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