An empirical approach to the evolution of diversified life histories of green algae

• Project/Area Number: 15K14598
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Ecology/Environment
• Research Institution: Chiba University
• Principal Investigator: Togashi Tatsuya 千葉大学, 海洋バイオシステム研究センター, 教授 (70345007)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
• Keywords: 異型配偶 / 性淘汰 / 精子競争 / 性的二型 / 生活史 / 繁殖戦略

Outline of Final Research Achievements

In this study, using a haplodiplontic marine green alga, Monostroma angicava of the Ulvophyceae, we approached to the evolution of diversified life histories of green algae. We found that the parthenogenetic developmental fates are independent of gamete size: genetically identical gametes of an equal size formed in the same gametangium had different fates. However, parthenogenetic survival of gametes by developing into either a partheosporophyte or a parthenogametophyte positively depended on gamete size.

Research Products

• [Int'l Joint Research] University of Liverpool(United Kingdom)
• [Int'l Joint Research] University of Liverpool(英国)
• [Journal Article] 北海道小樽市の忍路湾に生育するハネモ属海産緑藻１種の分類学的位置付けについて (2017)
  • Author(s): 杉井優太郎、富樫辰也
  • Journal Title: 海洋バイオシステム研究 Volume: 印刷中
  • NAID: 40021498899
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evidence for equal size cell divisions during gametogenesis in a marine green alga Monostroma angicava. (2015)
  • Author(s): Togashi T, Horinouchi Y, Sasaki H, Yoshimura J.
  • Journal Title: Scientific Reports Volume: 5 Issue: 1 Pages: 1-9
  • DOI: 10.1038/srep13672
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 海産緑藻の生活環における隠れた種内多型の発見 (2017)
  • Author(s): 堀之内祐介、茂呂竜太郎、若菜雄、富樫辰也
  • Organizer: 第64回日本生態学会大会
  • Place of Presentation: 早稲田大学早稲田キャンパス（東京都新宿区）
  • Year and Date: 2017-03-14
• [Presentation] 海産緑藻エゾヒトエグサにおいて新たに発見した生活史経路 (2016)
  • Author(s): 堀之内祐介、杉井優太郎、若菜雄、茂呂竜太郎、富樫辰也
  • Organizer: 第６３回日本生態学会大会
  • Place of Presentation: 仙台国際センター(仙台市)
  • Year and Date: 2016-03-20
• [Presentation] 海産緑藻配偶システムの進化に見る偶然と必然 (2016)
  • Author(s): 富樫辰也
  • Organizer: 第６３回日本生態学会大会
  • Place of Presentation: 仙台国際センター(仙台市)
  • Year and Date: 2016-03-20