• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

始新世/漸新世境界における沿岸海洋域での一次生産者交代事変と表層流変動の解明

Research Project

Project/Area Number 18840026
Research Category

Grant-in-Aid for Young Scientists (Start-up)

Allocation TypeSingle-year Grants
Research Field Stratigraphy/Paleontology
Research InstitutionNagoya University

Principal Investigator

須藤 斎  Nagoya University, 環境学研究科, 助教 (80432227)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥2,760,000 (Direct Cost: ¥2,760,000)
Fiscal Year 2007: ¥1,380,000 (Direct Cost: ¥1,380,000)
Fiscal Year 2006: ¥1,380,000 (Direct Cost: ¥1,380,000)
Keywords珪藻休眠胞子 / 漸新世 / 始新世 / 古環境変動 / 一次生産者 / 渦鞭毛藻シスト / 海洋構造 / 進化
Research Abstract

本研究の目的は,「温室地球」から「氷室地球」への転換点である始新世/漸新世(Eocene/Oligocene)境界(約3,300万年前;以降E/O境界)付近で,珪藻Chaetoceros属が渦鞭毛藻類に替わって沿岸生態系の主要な一次生産者と進化していった過程を解明することである.
申請者の研究により,ノルウェー海から得られたボーリングコアDSDP Site 338サンプル中のE/O境界付近で,Chaetoceros属休眠胞子の多様性と産出頻度が激増する「Chaetoceros爆発」イベントが起きたことが解明された.一方,世界中の渦鞭毛藻類の休眠シストは,逆に多様性と産出量が急減しており,沿岸域における主要一次生産者が渦鞭毛藻類からChaetoceros属に急激に交代した可能性が示唆された.また,申請者が参加した北極掘削航海(IODP302)における成果より,始新世後期に,これまで知られていなかった北極海にも氷が存在していたことが明らかになった(Moran, et. al.2006).さらに,Chaetoceros属休眠胞子以外の珪藻休眠胞子グループが渦鞭毛藻シストと同様に,この時代に世界的に急減(絶滅)している事象を明らかにした(Suto, et al.,印刷中).これらのことから,E/O境界付近で海洋海流構造と熱循環構造が季節ごとに安定的に変動する環境から,現在のペルー沖で見られるエルニーニョ・ラニーニャ変動のような数年〜数十年レベルで変化する環壌が作られていったことが示唆された.
また,現在アフリカ西沖のE/O境界を含み,珪藻化石を豊富に含有するコアサンプル(DSDP Sites 366&369)を高時間分解能で分析することによって,本イベントの正確な年代と各タクサ間および酸素同位体イベントとの対応関係,さらにこれらのイベントが全世界的に同時に起きていたのかを明らかにするため研究を進めている.

Report

(2 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • Research Products

    (17 results)

All 2008 2007 2006 Other

All Journal Article (8 results) (of which Peer Reviewed: 4 results) Presentation (8 results) Remarks (1 results)

  • [Journal Article] A siliceous microfossil view of middle Eocene Arctic paleoenvironments: a window of biosilica production and preservation2008

    • Author(s)
      Stickley, C.E., Koc, N., Brumsack, H.-J., Jordan, R.W. & Suto, I.
    • Journal Title

      Paleoceanography 23

      Pages: 1-14

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Taxonomy of the fossil marine diatom resting spore genus Goniothecium Ehrenberg and its allied species2008

    • Author(s)
      Suto, I., Jordan, R.W. & Watanabe, M.
    • Journal Title

      Diatom Research (印刷中)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Taxonomy of middle Eocene diatom resting spores and their allied taxafrom IODP sites in the central Arctic Ocean (the Lomonosov Ridge)2008

    • Author(s)
      Suto, 1., Jordan, R.W. & Watanabe, M.
    • Journal Title

      Micropaleontology (印刷中)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The Oligocene and Miocene record of the diatom resting spore genus Liradiscus Greville in the Norwegian Sea2007

    • Author(s)
      Suto, I.
    • Journal Title

      Micropaleontology 53

      Pages: 145-159

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Taxonomy of the fossil marine diatom resting spore morpho-genera Xanthioisthmus Suto gen. nov. and Quadrocistella Suto gen. nov. in the North Pacific and Norwegian Sea2006

    • Author(s)
      Suto, Itsuki
    • Journal Title

      Journal of Micropalaeontology 25

      Pages: 3-22

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Truncatulus gen. nov., a new fossil resting spore morpho-genus related to the marine diatom genus Chaetoceros (Bacillariophyceae)2006

    • Author(s)
      Suto, Itsuki
    • Journal Title

      Phycologia 45

      Pages: 585-601

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The Cenozoic palaeoenvironment of the Arctic Ocean2006

    • Author(s)
      Moran, K., Backman, J., Brinkhuis, H., Clemens, S.C., Cronin, T., Dickens, G.R, Eynaud, F., Gattacceca, J., Jakobsson, M., Jordan, R.W., Kaminski, M., King, J., Koc, N., Krylov, A., Martinez, N., Matthiessen, J., McInroy, D., Moore, T.C., Onodera, J., O'Regan, M., Palike, H., Rea, B., Rio, D., Sakamoto, T., Smith, D.C., Stein, R., St John, K., Suto, I., Suzuki, N., Takahashi, K., Watanabe, M., Yamamoto, M., Farrell, J., Frank, M., Kubik, P., Jokat, W., Kristoffersen, Y.
    • Journal Title

      Nature 441

      Pages: 601-605

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 始新世/漸新世境界(約3,370万年前)の渦鞭毛藻類から珪藻類への一次生産者交代事変の可能性.2006

    • Author(s)
      須藤 斎
    • Journal Title

      藻類 54・2

      Pages: 95-97

    • NAID

      10020132345

    • Related Report
      2006 Annual Research Report
  • [Presentation] A siliceous microfossil view of Middle Eocene Arctic paleoenvironments: a window of biosilica production and preservation (Poster Session)2007

    • Author(s)
      Stickley, C.E., Koc, N., Brumsack H-J., Tordan, R.W. & Suto, I.
    • Organizer
      American Geophysical Union (AGU)
    • Place of Presentation
      サンフランシスコ
    • Year and Date
      2007-12-13
    • Related Report
      2007 Annual Research Report
  • [Presentation] Paleoenvironmental changes affected on the diversity explosion and extinction events of the fossil diatom resting spore assemblage across the E/O boundary (Poster Session)2007

    • Author(s)
      Suto, I., Jordan, R.W. & Watanabe, M.
    • Organizer
      American Geophysical Union (AGU)
    • Place of Presentation
      サンフランシスコ
    • Year and Date
      2007-12-11
    • Related Report
      2007 Annual Research Report
  • [Presentation] 休眠胞子の形成と分裂方法についての新たなる知見-休眠胞子化石Goniothecium属とChaetoceros属のpaired sporeの構造から-2007

    • Author(s)
      須藤 斎
    • Organizer
      日本珪藻学会第27回研究集会
    • Place of Presentation
      豊田市
    • Year and Date
      2007-11-04
    • Related Report
      2007 Annual Research Report
  • [Presentation] The biostratigraphy of fossil diatom resting spores and paleoceanographic events (as Keynote Speaker)2007

    • Author(s)
      Suto, I.
    • Organizer
      IX International Congress on Pacific Neogene Stratigraphy
    • Place of Presentation
      筑波大学
    • Year and Date
      2007-10-02
    • Related Report
      2007 Annual Research Report
  • [Presentation] E/O境界における珪藻休眠胞子化石群集の2つのイベント(CEE & non CEE)と海洋環境変動との関連性2007

    • Author(s)
      須藤 斎
    • Organizer
      日本地質学会第114年学術大会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] Taxonomy and biostratigraphy of the fossil resting spore of the marine diatom genus Chaetoceros and non-Chaetoceros group2007

    • Author(s)
      Suto, I.
    • Organizer
      2nd Neogene Polar Marine Diatom Workshop
    • Place of Presentation
      ネブラスカ大学(アメリカ)
    • Year and Date
      2007-08-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] Diversity explosion and extinction events of the fossil diatom resting spore assemblage across the E/O boundary2007

    • Author(s)
      Suto, I.
    • Organizer
      2nd Neogene Polar Marine Diatom Workshop
    • Place of Presentation
      ネブラスカ大学(アメリカ)
    • Year and Date
      2007-08-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] 約3300万年前における珪藻休眠胞子化石群集の絶滅・多様化イベント2007

    • Author(s)
      須藤 斎
    • Organizer
      日本珪藻学会第28回大会
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-05-19
    • Related Report
      2007 Annual Research Report
  • [Remarks]

    • URL

      http://www.geocities.jp/restingspace2/

    • Related Report
      2007 Annual Research Report

URL: 

Published: 2006-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi