Origin of deep-dwelling coccolithophores

• Project/Area Number: 26400505
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Stratigraphy/Paleontology
• Research Institution: Kochi University
• Principal Investigator: Hagino Kyoko 高知大学, その他部局等, 客員講師 (90374206)
• Co-Investigator(Kenkyū-buntansha): 松岡 裕美 高知大学, 教育研究部自然科学系理学部門, 准教授 (60222296)
• Co-Investigator(Renkei-kenkyūsha): HORIGUCHI Takeo 北海道大学, 理学研究院, 教授 (20212201)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 円石藻 / 石灰質ナノ化石 / 進化 / 微化石 / 生層序 / コッコリス / 下部有光層 / 層序

Outline of Final Research Achievements

We have studied distribution, seasonal change, morphology of coccoliths, molecular-phylogenetic position, and fossil record of Florisphaera profunda and Gladiolithus flabellatus that dominate coccolithophore assemblage of lower photic-zone in the tropical-transitional oceans. Floristic studies showed that F. profunda increase in abundance in late summer in the NW Pacific, and in late autumn in the Sea of Japan. Morphological studies revealed that coccoliths of F. profunda are hetero-coccolith. Molecular phylogenetic studies confirmed that F. profunda and G. flabellatus are included in the hetero-coccoliths bearing coccolithophore clade. Biostratigraphic studies showed that F. profunda occur from the Early Miocene.

Research Products

• [Journal Article] Reference samples to learn calcareous nannofossil biostratigraphy from Miocene to Pleistocene (2016)
  • Author(s): Hagino, K., Utsunomiya, M., Tanaka, Y., Iwai, M.
  • Journal Title: Bull. Natl. Mus. Nat. Sci., Ser. C Volume: 42 Pages: 5-17
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Extracellular calcification of Braarudosphaera bigelowii deduced from electron microscopic observations of cell surface structure and elemental composition of pentaliths (2016)
  • Author(s): Hagino, K., K., Tomioka, N., Young, J.R., Takano, Y., Onuma, R., Horiguchi, T.
  • Journal Title: Marine Micropaleontology Volume: 125 Pages: 85-94
  • DOI: 10.1016/j.marmicro.2016.04.002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Re-discovery of a “living fossil” coccolithophore from the coastal waters of Japan and Croatia (2015)
  • Author(s): Kyoko Hagino, Jeremy R. Young, Paul R. Bown, Jelena Godrijan, Denise K. Kulhanek, Kazuhiro Kogame, Takeo Horiguchi
  • Journal Title: Marine Micropaleontology Volume: 116 Pages: 28-37
  • DOI: 10.1016/j.marmicro.2015.01.002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Biology and paleontology of coccolithophores (Haptophytes) (2015)
  • Author(s): Kyoko Hagino and Jeremy R. Young
  • Journal Title: Marine Protists: Diversity and Dynamics Volume: 1 Pages: 311-330
  • DOI: 10.1007/978-4-431-55130-0_12
  • ISBN: 9784431551294, 9784431551300
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Gladiolithus adeyi sp. nov.: a new deep photic coccolithophore species and new molecular genetic and crystallographic observations on Gladiolithus flabellatus (2014)
  • Author(s): Jeremy R. Young, Kyoko Hagino, Alex J. Poulton
  • Journal Title: Journal of Nannoplankton Reserach Volume: 26 Pages: 61-68
  • Peer Reviewed
• [Presentation] 形態と分子系統で探る円石藻の多様化と環境適応 (2017)
  • Author(s): 萩野恭子
  • Organizer: 日本古生物学会 第166回例会 夜間小集会
  • Place of Presentation: 早稲田大学
• [Presentation] 形態と化学組成から探る円石藻Braarudosphaera bigelowii の鱗片石灰化様式 (2016)
  • Author(s): 萩野恭子，富岡尚敬，Jeremy R. Young，高野義人，大沼亮 ，堀口健雄
  • Organizer: 日本藻類学会第40回大会
  • Place of Presentation: 日本歯科大学（東京都千代田区）
  • Year and Date: 2016-03-18
• [Presentation] Possibility of extracellular calcification of Braarudosphaera bigelowii deduced from cell-surface structure and elemental compositions of pentaliths by analytical electron microscopy (2015)
  • Author(s): Kyoko Hagino, Ryo Onuma, Yoshihito Takano, Jeremy R. Young, Naotaka Tomioka, and Takeo Horiguchi
  • Organizer: 15th International Nannoplankton Association meeting
  • Place of Presentation: South Palms Resort, Bohol, Philippines
  • Year and Date: 2015-03-07 – 2015-03-16
• [Presentation] Seasonal change in living coccolithophores in the coastal waters of Japan (2014)
  • Author(s): Kyoko Hagino, Jeremy R. Young, Paul R. Bown, Jelena Godrijan, Kazuhiro Kogame, Denise K. Kulhanek and Takeo Horiguchi
  • Organizer: Coccolithophores 2014, INA workshop on Extant Coccolithophores research
  • Place of Presentation: Hellenic Centre for Marine research, Heraklion, Greece
  • Year and Date: 2014-10-05 – 2014-10-10