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2009 Fiscal Year Final Research Report

Evolution of the ability to form a siliceous test of protists based on the molecular phylogeny

Research Project

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Project/Area Number 19540491
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionTokyo Gakugei University

Principal Investigator

TAKAHASHI Osamu  Tokyo Gakugei University, 教育学部, 准教授 (20242232)

Co-Investigator(Renkei-kenkyūsha) MAYAMA Shigeki  東京学芸大学, 教育学部, 准教授 (40199914)
MATSUOKA Atsushi  新潟大学, 理学部, 教授 (00183947)
TAKEMURA Akihiro  琉球大学, 理学部, 准教授 (40222103)
Project Period (FY) 2007 – 2009
Keywords放散虫 / 共生藻 / 分子系統 / 18S Rdna / シリカ / 骨殻
Research Abstract

Living radiolarians generally possess algal symbionts. They are generally recognized as yellow-green or yellow-brown, minute spheres, and variable in size, about 3 to 10 micrometers. The majority of modern symbionts-bearing radiolarians appear to depend on their symbionts to provide photosynthetically fixed carbon and to maintain the radiolarians in low nutrient environments (e.g., Anderson, 1978). In this study, Dinoflagellates, chlorophytes, and haptophytes were identified as endosymbionts of radiolarians of Euchitonia elegans (Ehrenberg), Dictyocoryne truncatum (Ehrenberg), and Spongaster tetras Ehrenberg by molecular and ultrastructural analyses. Moreover, I made clear that Dictyocoryne profunda Ehrenberg, which have been considered to not have algal symbionts, harbor many cyanobacteria symbionts on the surface.
The present results show that the different species of radiolarians can have different symbionts and they can be strong specificity. If the same radiolarian species does associate with different algae, this might be the flexibility in choice of symbionts ; however, the present results possibly reject this hypothesis. The non-flexibility of these interactions probably suggests Radiolaria have a common mechanism for the recognition and selection of symbionts.

  • Research Products

    (15 results)

All 2010 2009 2008 2007

All Journal Article (5 results) Presentation (10 results)

  • [Journal Article] Molecular identification of reproductive cells released from Cypassis irregularis Nigrini (Radiolaria).2010

    • Author(s)
      K. Kimoto, T. Yuasa, O. Takahashi
    • Journal Title

      Environmental Microbiology Rport (in press)

  • [Journal Article] A simple technique for extracting small subunit ribosomal DNAs from both the host and symbiont of a single radiolarian specimen.2009

    • Author(s)
      Tomoko Yuasa, Osamu Takahashi, Shigeki Mayama
    • Journal Title

      News of Osaka Micropaleontologists Special Volume14

  • [Journal Article] Molecular phylogenetic position of Hexacontium pachydermum Jorgensen (Radiolaria).2009

    • Author(s)
      Yuasa, T., Dolven J.K., Bjorklund, K.R., Mayama, S., Takahashi, O.
    • Journal Title

      Marine Micropaleontology 73

      Pages: 129-134

  • [Journal Article] SEM observations of the fracture morphology of Acantharea (Radiolaria) from the East China Sea, Okinawa, Japan.2009

    • Author(s)
      K. Shimmen, O. Takahashi, T. Yuasa
    • Journal Title

      Bull. Tokyo Gakugei Univ., Nat. Sci 61

      Pages: 55-62

  • [Journal Article] Molecular diversity of alveolates associated with nertic north atlantic radiolarians.2007

    • Author(s)
      J.K. Dolven, Charlotte Lindqvist, Victoe A. Albert, Kjell. R. Bjorklund, Tomoko Yuasa
    • Journal Title

      Osamu Takahashi, Shigeki Mayama, Protist 158

      Pages: 65-76

  • [Presentation] Molecular phylogenetic position of parasitic and symbiotic algae in radiolarians.2009

    • Author(s)
      T. Yuasa, T. Horiguchi, S. Mayama, O. Takahashi
    • Organizer
      Workshop on molecular systematics of Amoebozoa and Rhizaria
    • Place of Presentation
      スイス・ジュネーブ
    • Year and Date
      20090000
  • [Presentation] 放散虫に共生する藻類の分子解析と微細構造観察.2009

    • Author(s)
      湯浅智子・堀口健雄・真山茂樹・高橋修
    • Organizer
      日本藻類学会第33回大会
    • Place of Presentation
      沖縄
    • Year and Date
      20090000
  • [Presentation] 放散虫に共生する渦鞭毛藻, ハプト藻, 緑藻およびシアノバクテリアの微細構造観察.2009

    • Author(s)
      湯浅智子・堀口健雄・真山茂樹・高橋修
    • Organizer
      日本古生物学会2009年年会
    • Place of Presentation
      千葉
    • Year and Date
      20090000
  • [Presentation] 放散虫に共生する藻類の多様性と種特異性.2009

    • Author(s)
      湯浅智子・堀口健雄・高橋修・真山茂樹
    • Organizer
      第4回日本進化原生生物研究会(JSEP)
    • Place of Presentation
      仙台
    • Year and Date
      20090000
  • [Presentation] Molecular phylogenetic position of Hexacontium pachydermum Jorgensen2009

    • Author(s)
      O. Tkahashi, T. Yuasa, J.K. Dolven, K.R. Bjorklund, S. Mayama
    • Organizer
      12th Meeting of the International Association of Radiolarian Paleontologists
    • Place of Presentation
      南京
    • Year and Date
      20090000
  • [Presentation] Molecular and fine-structural studies of symbiotic algae in Radiolaria.2009

    • Author(s)
      T. Yuasa, T. Horiguchi, S. Mayama, O. Takahashi
    • Organizer
      12th Meeting of the International Association of Radiolarian Paleontologists
    • Place of Presentation
      南京
    • Year and Date
      20090000
  • [Presentation] Molecular phylogenetic and fine-structural studies of Radiolaria.2009

    • Author(s)
      T. Yuasa, T. Horiguchi, O. Takahashi, S. Mayama
    • Organizer
      JSPS Radiolarian Biology based on Paleoceanography workshop
    • Place of Presentation
      福岡
    • Year and Date
      20090000
  • [Presentation] Hexacontium pachydermum Jorgensenの分子系統.2008

    • Author(s)
      高橋修
    • Organizer
      琉球大学熱帯生物圏センター共同利用研究会「有殻原生生物プランクトン研究はどこに向かうのか」
    • Place of Presentation
      沖縄・琉球大
    • Year and Date
      20080000
  • [Presentation] Molecular phylogenetic position of parasitic algae in radiolarians.2008

    • Author(s)
      T. Yuasa, O. Takahashi, K.R.
    • Organizer
      International Symposium on Protistology "Evolution and Diversity
    • Place of Presentation
      Bjorklund, 筑波
    • Year and Date
      20080000
  • [Presentation] 現生放散虫の細胞内に寄生するピコプランクトンMarine Alveolate Group I.2008

    • Author(s)
      湯浅智子・K. R, Bjorklund・真山茂樹・高橋修
    • Organizer
      日本古生物学会2008年年会
    • Year and Date
      20080000

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Published: 2011-06-18   Modified: 2016-04-21  

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