Origin and phylogeny of Scaptomyza (Diptera: Drosophilidae)

• Project/Area Number: 24570092
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biodiversity/Systematics
• Research Institution: Hokkaido University
• Principal Investigator: KATOH Toru 北海道大学, 理学(系)研究科(研究院), 助教 (80374198)
• Co-Investigator(Kenkyū-buntansha): DICK Matthew. H. 北海道大学, 大学院理学研究院, 非常勤講師 (80374205)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 分子系統 / ショウジョウバエ / 分岐年代 / 祖先分布 / Scaptomyza

Outline of Final Research Achievements

The genus Scaptomyza is one of the incredibly diversified groups in the family Drosophilidae, in which about 60% species are endemic to Hawaiian Islands while the remaining species are distributed in continents. There have been two alternative hypotheses for the origin of Scaptomyza. One is that the genus originated in Hawaii and subsequently diversified in continents, another is that these species originated in continents and subsequently colonized in Hawaii. In order to verify this problem, we determined the nucleotide sequences of 11 genes for the 11 species of Scaptomyza. Together with the homologous sequences for 79 species, we reconstructed the phylogenetic trees and then inferred the ancestral distributions and divergence times. Our results revealed that Scaptomyza would have originated outside Hawaii, supporting the continental origin hypothesis. In addition, our results revealed that the migration of Scaptomyza from continents to Hawaii would have occurred twice independently.

Research Products

• [Journal Article] Colocasiomyia (Diptera: Drosophilidae) revised phylogenetically, with a new species group having peculiar life cycles on monsteroid (Araceae) host plants. (2013)
  • Author(s): Fartyal, R. S., Gao, J.-j., Toda, M. J., Hu, Y.-g., Takenaka Takano, K., Suwito, A., Katoh, T., Takigahira, T. & Yin, J.-t.
  • Journal Title: Systematic Entomology Volume: 38 Issue: 4 Pages: 763-782
  • DOI: 10.1111/syen.12027
  • Peer Reviewed
• [Presentation] Scaptomyza属ショウジョウバエの系統進化 (2014)
  • Author(s): 加藤徹，山下伸志，福田洋之，Matthew H. Dick，和多田正義
  • Organizer: 日本昆虫学会第74回大会
  • Place of Presentation: 広島大学（広島県東広島市）
  • Year and Date: 2014-09-14 – 2014-09-16
• [Presentation] Drosophila亜属の系統と進化 －quinaria sectionのショウジョウバエを中心に－ (2012)
  • Author(s): 加藤 徹・福田洋之・越川滋行
  • Organizer: 日本進化学会
  • Place of Presentation: 首都大学東京（八王子市）
• [Presentation] Scaptomyza属ショウジョウバエの起源と系統関係 (2012)
  • Author(s): 加藤 徹・山下伸志・和多田正義
  • Organizer: 日本遺伝学会
  • Place of Presentation: 九州大学（福岡市）
• [Remarks] Toru Katoh
  • URL: http://www.sci.hokudai.ac.jp/~tkatoh/
• [Remarks] Toru Katoh - ResearchGate
  • URL: http://www.researchgate.net/profile/Toru_Katoh
• [Remarks] Toru Katoh
  • URL: http://www.sci.hokudai.ac.jp/~tkatoh/
• [Remarks] Toru Katoh - ResearchGate
  • URL: http://www.researchgate.net/profile/Toru_Katoh
• [Remarks] Toru Katoh, Ph.D.
  • URL: http://www.sci.hokudai.ac.jp/~tkatoh/