Evolution and diversification of Braarudosphaera bigelowii

• Project/Area Number: 20740296
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Stratigraphy/Paleontology
• Research Institution: Okayama University
• Principal Investigator: HAGINO Kyouko Okayama University, 地球物質科学研究センター, 非常勤研究員 (90374206)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2008: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 円石藻 / 進化 / コッコリス / Braarudosphaera bigelowii / 石灰質ナノプランクトン / 微化石

Research Abstract

Our morphometric and genetic studies of living Braarudosphaea bigelowii revealed that size-variation in living B. bigelowii is result of speciation with size-variation. This result suggests that size-diversification in fossil B. bigelowii is indicative of speciation of this taxon in geological age. Morphometric studies of Cenozoic Braarudosphaera showed that morphology and size of Braarudosphaera diversified greatly in the samples from 2.7-1.7Ma, likely corresponds with the low diversity period of coccolithophores.

Research Products

• [Journal Article] サイズ変化を伴った円石藻の種分化-古生物学的・生物学的手法に基づいた検証- (2011)
  • Author(s): 萩野恭子, 堀口健雄, 高野義人, 松岡裕美
  • Journal Title: プランクトン学会報 58号 Pages: 73-80
  • NAID: 10027957355
  • Peer Reviewed
• [Journal Article] サイズ変化を伴った円石藻の種分化-古生物学的・生物学的手法に基づいた検証- (2011)
  • Author(s): 萩野恭子, 堀口健雄, 高野義人, 松岡裕美
  • Journal Title: プランクトン学会報 Volume: 58 Pages: 73-80
  • NAID: 10027957355
  • Peer Reviewed
• [Journal Article] Pseudocryptic speciation in living (2009)
  • Author(s): Kyoko Hagino, Yoshihito Takano, Takeo Horiguchi
  • Journal Title: Braarudosphaera bigelowii. Marine Micropaleontology 72 Pages: 210-221
  • Peer Reviewed
• [Journal Article] Data report : calcareous nannofossils from upper Pliocene and Pleistocene, Expedition 306 Sites U1313 and U13141 (2009)
  • Author(s): Kyoko Hagino, Denise Kulhanek
  • Journal Title: Proceedings of the Integrated Ocean Drilling Program Volume(CD-ROM) Pages: 303-306
  • Peer Reviewed
• [Journal Article] Pseudocryptic speciation in living Braarudosphaera bigelowii (2009)
  • Author(s): Kyoko Hagino, Yoshihito Takano.Takeo Horiguchi
  • Journal Title: Marine Micropaleontology 72 Pages: 210220-210220
  • Peer Reviewed
• [Journal Article] Neogene and Quaternary Ghost Shrimps and Crabs (Crustacea : Decapoda) from the Philippines (2008)
  • Author(s): Karasara. Kato. Kase. Maac-Aguilar. Kurihara. Hayashi
  • Journal Title: Bull. Natn. Sci. Mus., Tokyo. C 34 Pages: 51-76
• [Presentation] El Mahdi Bendif, Ian Probert, Colomban De Vargas, Hisatake Okada「New evidence on morphological and genetic variation in the cosmopolitan coccolithophore Emiliania huxleyi」 (2010)
  • Author(s): Kyoko Hagino, Jeremy R.Young, Kazuhiro Kogame, Takeo Horiguchi, Yoshihito Takano
  • Organizer: 第13回国際ナノプランクトン学会
  • Place of Presentation: 山形テラッサ
  • Year and Date: 2010-09-06
• [Presentation] New evidence on morphological and genetic variation in the cosmopolitan coccolithophore Emiliania huxleyi (2010)
  • Author(s): Kyoko Hagino, Jeremy R. Young, Kazuhiro Kogame, Takeo Horiguchi, Yoshihito Takano, El Mahdi Bendif, Ian Probert, Colomban De Vargas, Hisatake Okada
  • Organizer: 13th International Nannoplankton Association Conference
  • Place of Presentation: 山形テラッサ(山形県)
  • Year and Date: 2010-09-06
• [Presentation] 円石藻の形態・サイズ進化の解明への地質学的・生物学的アプローチ (2010)
  • Author(s): 萩野恭子, 高野義人, 堀口健雄
  • Organizer: プランクトン学会春期シンポジウム「原生生物の多様性と生態的機能」
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2010-03-30
• [Presentation] 円石藻の形態サイズ進ヒの解明への 地質学的・生物学的アプローチ (2010)
  • Author(s): 萩野恭子, 高野義人, 堀口健雄
  • Organizer: 日本プランクトン学会春期シンポジウム「原生生物の多様性と生態的機能」
  • Place of Presentation: 東京海洋大学
  • Year and Date: 2010-03-30
• [Presentation] Biological and geological approaches to pseudo-cryptic speciation in a coccolithophore, Braarudosphaera bigelowii (2009)
  • Author(s): Kyoko Hagino, Yoshihito Takano, Takeo Horiguchi萩野恭子, 高野義人, 堀口健雄
  • Organizer: 日本学術振興会・日仏二国間交流事業研究集会"Radiolarian Biology based on Paleoceanography Workshop"
  • Place of Presentation: 九州大学
  • Year and Date: 2009-11-12
• [Presentation] Biological and geological approaches to pseudo-cryptic speciation in a coccolithophore, Braarudosphaera biaelowii (2009)
  • Author(s): Kyoko Hagino, Yoshihito Takano, Takeo Horiguchi
  • Organizer: 日本学術振興会・日仏二国間交流事業「Radiolarian Biology based on Paleoceanography Workshop:生物学に基づく古海洋学の新展望」
  • Place of Presentation: 九州大学
  • Year and Date: 2009-11-12
• [Presentation] Braarudosphaera bigelowiiの多様化とサイズ変化 (2009)
  • Author(s): 萩野恭子, 高野義人, 堀口健雄
  • Organizer: 古海洋シンポジウム
  • Place of Presentation: 東京大学海洋研究所
  • Year and Date: 2009-01-08
• [Presentation] Pseudocryptic speciation of living Braarudosphaera bigelowii (2008)
  • Author(s): Kyoko Hagino
  • Organizer: International Nannoplankton Association, 12th Conference
  • Place of Presentation: University Lyonl
  • Year and Date: 2008-09-10
• [Presentation] Pseudocryptic speciation of living Braarudosphaera bigelowii (2008)
  • Author(s): Kyoko Hagino, Yoshihito Takano, Takeo Horiguchi
  • Organizer: 第12回国際ナノプランクトン学会
  • Place of Presentation: リヨン第一大学(フランス)
  • Year and Date: 2008-09-08
• [Remarks] 国立科学博物館・企画展「深海探査と微化石の世界-HMSチャレンジャーから"ちきゅう"まで」(2009年12月12日～2010年2月28日)の小冊子の,ハプト藻の頁(p.7)を執筆,また同企画展に展示協力を行つた