The molecular mechanism of speciation by sensory drive

2010 Fiscal Year Final Research Report

• Project/Area Number: 21770085
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Biodiversity/Systematics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: TERAI Yohey Tokyo Institute of Technology, 大学院・生命理工学研究科, 特任助教 (30432016)
• Project Period (FY): 2009 – 2010
• Keywords: 種分化 / 種形成 / 適応 / 光受容体 / 生殖的隔離

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.

Research Products

• [Journal Article] Reverse evolution in RH1 for adaptation of cichlids to water depth in Lake Tanganyika. (2011)
  • Author(s): Nagai H., Terai Y.(共同筆頭著者), Sugawara T., Imai H., Nishihara H., Hori M., Okada N.
  • Journal Title: Molecular Biology and Evolution in press
  • Peer Reviewed
• [Journal Article] Population structure of two closely related pelagic cichlids in Lake Victoria, Haplochromis pyrrhocephalusand H. (2009)
  • Author(s): Maeda K., Takeda M., Kamiya K., Aibara M., Mzighani S.I., Nishida M., Mizoiri S., Sato T., Terai Y., Okada N., Tachida H.
  • Journal Title: laparogramma.Gene 441 Pages: 67-73
  • Peer Reviewed
• [Presentation] シクリッドの視覚の適応的な多様化と種分化 (2010)
  • Author(s): 寺井洋平、宮城竜太郎、溝入真治、相原光人、Semvua I.Mzighani、菅原亨、今井啓雄、岡田典弘
  • Organizer: 日本動物学会
  • Place of Presentation: 東京大学(東京)
  • Year and Date: 2010-09-24
• [Presentation] 生息環境での光の受容効率からみたシクリッドのオプシンの適応と種分化 (2010)
  • Author(s): 寺井洋平、宮城竜太郎、溝入真治、相原光人、Semvua I.Mzighani、沖津貴志、和田昭盛、菅原亨、今井啓雄、岡田典弘
  • Organizer: 日本進化学会
  • Place of Presentation: 東京工業大学(東京)
  • Year and Date: 2010-08-04
• [Presentation] 光環境への視覚適応が引き起こすシクリッドの種分化種 (2009)
  • Author(s): 寺井洋平、宮城竜太郎、溝入真治、相原光人、Semvua I.Mzighani、菅原亨、今井啓雄、岡田典弘
  • Organizer: 生物学会
  • Place of Presentation: 八王子セミナーハウス(八王子)
  • Year and Date: 2009-12-13
• [Presentation] 水深による光環境の変化への視覚の適応と婚姻色の進化と種の分化 (2009)
  • Author(s): 寺井洋平、宮城竜太郎、溝入真治、相原光人、Semvua I.Mzighani、菅原亨、今井啓雄、岡田典弘
  • Organizer: 日本魚類学会
  • Place of Presentation: 東京海洋大学(品川)
  • Year and Date: 2009-10-10
• [Presentation] 水深による光環境の変化への視覚の適応と婚姻色の進化と種の分化 (2009)
  • Author(s): 寺井洋平、宮城竜太郎、溝入真治、相原光人、Semvua I.Mzighani、菅原亨、今井啓雄、岡田典弘
  • Organizer: 日本進化学会
  • Place of Presentation: 北海道大学(札幌)
  • Year and Date: 2009-09-03
• [Book] シクリッドの視覚の適応と種分化 現代の生態学9巻「淡水生態学のフロンティア」 (2011)
  • Author(s): 寺井洋平、岡田典弘
  • Publisher: 共立出版(予定)
• [Book] 環境が生みだす新しい種:光環境への適応がもたらすシクリッドの種分化 種生物学会単行本「生き物の眼をとおして覗く世界」 (2011)
  • Author(s): 寺井洋平、岡田典弘
  • Publisher: 文一総合出版(予定)
• [Book] 進化学事典 48章「種分化」 48.1章「異所的種分化」 48.2章「同所的、側所的種分化」 (2011)
  • Author(s): 寺井洋平
  • Publisher: 共立出版(予定)
• [Book] Speciation by sensory drive in cichlid fishes in "From genes to animal behavior : social structures, personalities, communication by color" (2010)
  • Author(s): Terai, Y., Okada, N.
  • Total Pages: 311-328
  • Publisher: Springer Japan