| Project/Area Number |
21770085
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TERAI Yohey Tokyo Institute of Technology, 大学院・生命理工学研究科, 特任助教 (30432016)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 種分化 / 種形成 / 適応 / 光受容体 / 生殖的隔離 |
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| Research Abstract |
Last a few years, we demonstrated clear-cut examples of sensory drive speciation (adaptation in sensory for signaling systems to different environments cause premating isolation) by showing adaptations of opsins, divergent natural selection on opsins, and divergence in male breeding coloration. Here, we demonstrate that the signatures of sensory drive speciation are commonly observed in Lake Victoria cichlids. We collected species from near the surface to the deepest bottom in Lake Victoria, and analyzed their opsins. Strong natural selection fixed long wavelength sensitive opsin, LWS, and RH1 alleles with different predicted light absorbance properties at different ambient light environments. By expressing and reconstituting them and measuring absorbance, we show that the fixed LWS and RH1 alleles adapt populations to different light environments. The adaptive evolution of the visual system coincides with the evolution in male conspicuous breeding coloration. Our results demonstrate that the male coloration evolving as a consequence of adaptation of visual sensitivities, leading to reproductive isolation of populations.
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