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The evolution of mammalian jaw mastication: applying the dental microwear texture analysis

Research Project

Project/Area Number 17K14411
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Stratigraphy/Paleontology
Research InstitutionThe University of Tokyo

Principal Investigator

Kubo Tai  東京大学, 総合研究博物館, 特別研究員 (40719473)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords食性 / マイクロウェア / 三次元形状解析 / 歯牙 / 中生代 / 生物地理 / 三畳紀 / 板歯類 / 系統比較法 / 歩行様式 / 体重進化 / エクサエレトドン / 咀嚼運動 / レーザー顕微鏡 / 三次元性状解析 / 獣弓類 / 咀嚼様式 / 三次元解析 / キノドン類
Outline of Final Research Achievements

This project aimed to reveal the evolution of mammalian mastication by analyzing three-dimensional surface morphology of dental microwear left by food-tooth and tooth-tooth contacts, the method known as dental microwear texture analysis (DMTA). We first analyzed extant mammals with a known diet and found the depth of dental microwear correlate with percent of graminoids in their diet. We also applied DMTA to Triassic Cynodon, Exaeretodon argentinus, and found their scratches are aligned in an anteroposterior direction reflecting the direction of their jaw movement. Our project confirmed that dental microwear reflects diet and DMTA can be applied to fossils that are more than 200 million years old.

Academic Significance and Societal Importance of the Research Achievements

生物の食性はその生物と周囲の環境との関係やその生物の食物網中での位置を知る上で不可欠である。本研究では摂食時の歯の微細な傷から、その生物の食性や顎運動の復元を目指した。研究を通じて草食動物の食物中のイネ科の割合が歯の微細な傷から推定可能な事が示された。これは絶滅種の食性や生息環境が歯化石から推定可能になる事を意味している。また二億年以上前の最古の恐竜と共存していた生物の歯化石にも摂食時の傷が残されている事も明らかになった。この成果は最古の哺乳類やその近縁種に本手法を適用する事で、哺乳類特有の咀嚼様式の進化の詳細を明らかにできる事を示している。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (25 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (11 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 11 results,  Open Access: 5 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] University of Reading(英国)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Biogeographical network analysis of Cretaceous Australian dinosaurs2020

    • Author(s)
      Kubo Tai
    • Journal Title

      Gondwana Research

      Volume: 82 Pages: 39-47

    • DOI

      10.1016/j.gr.2019.12.012

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Allometric growth of limb and body proportions in crocodylians2019

    • Author(s)
      Iijima M.、Kubo T.
    • Journal Title

      Journal of Zoology

      Volume: 309 Issue: 3 Pages: 200-211

    • DOI

      10.1111/jzo.12714

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Transitions between foot postures are associated with elevated rates of body size evolution in mammals2019

    • Author(s)
      Kubo Tai、Sakamoto Manabu、Meade Andrew、Venditti Chris
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 116 Issue: 7 Pages: 2618-2623

    • DOI

      10.1073/pnas.1814329116

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Comparative morphology of presacral vertebrae in extant crocodylians: taxonomic, functional and ecological implications2019

    • Author(s)
      Iijima Masaya、Kubo Tai
    • Journal Title

      Zoological Journal of the Linnean Society

      Volume: 印刷中

    • DOI

      10.1093/zoolinnean/zly096

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Biogeographical Network Analysis of Cretaceous Terrestrial Tetrapods: A Phylogeny-Based Approach2019

    • Author(s)
      Tai Kubo
    • Journal Title

      Systematic Biology

      Volume: 印刷中 Issue: 6 Pages: 1034-1051

    • DOI

      10.1093/sysbio/syz024

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Three-dimensional tooth surface texture analysis on stall-fed and wild boars (Sus scrofa)2018

    • Author(s)
      Yamada Eisuke、Kubo Mugino O.、Kubo Tai、Kohno Naoki
    • Journal Title

      PLOS ONE

      Volume: 13 Issue: 10 Pages: e0204719-e0204719

    • DOI

      10.1371/journal.pone.0204719

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The earliest record of Asian Eusuchia from the Lower Cretaceous Khok Kruat Formation of northeastern Thailand2018

    • Author(s)
      Kubo Tai、Shibata Masateru、Naksri Wilailuck、Jintasakul Pratueng、Azuma Yoichi
    • Journal Title

      Cretaceous research

      Volume: 82 Pages: 21-28

    • DOI

      10.1016/j.cretres.2017.05.021

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Comparative limb proportions reveal differential locomotor morphofunctions of alligatoroids and crocodyloids2018

    • Author(s)
      Iijima Masaya、Kubo Tai、Kobayashi Yoshitsugu
    • Journal Title

      Royal Society Open Science

      Volume: 5 Issue: 3 Pages: 171774-171774

    • DOI

      10.1098/rsos.171774

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Masticatory jaw movement of Exaeretodon argentinus (Therapsida: Cynodontia) inferred from its dental microwear.2017

    • Author(s)
      Kubo, T., Yamada, E. and Kubo M.O.
    • Journal Title

      PLoS ONE

      Volume: 12 Issue: 11 Pages: e0188023-e0188023

    • DOI

      10.1371/journal.pone.0188023

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dental microwear texture analysis of extant sika deer with considerations on inter-microscope variability and surface preparation protocols.2017

    • Author(s)
      Kubo, M.O., Yamada, E., Kubo, T. and Kohno N.
    • Journal Title

      Biosurface and Biotribology

      Volume: 3 Issue: 4 Pages: 155-165

    • DOI

      10.1016/j.bsbt.2017.11.006

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 歯のマイクロウェアに基づく採食生態推定法の進展と三次元マイクロウェア形状測定2017

    • Author(s)
      山田英佑、久保麦野、久保泰、甲能直樹
    • Journal Title

      化石

      Volume: 102 Pages: 73-85

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Dental microwear texture analyses of placodontids (Diapsida: Sauropterygia).2019

    • Author(s)
      Tai Kubo, Mugino O. Kubo, and Taketeru Tomita
    • Organizer
      The 12 th International Congress of Vertebrate Morphology
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Relationship between stomach contents and dental microwear texture of extant wild ruminants in japan.2019

    • Author(s)
      Kubo, M.O., Aiba, K., Yamada, E. and Kubo, T.
    • Organizer
      The 12 th International Congress of Vertebrate Morphology
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Biogeographical network analysis of cretaceous non-avian dinosaurs and biogeographical connections of Australia to other continents.2019

    • Author(s)
      Tai Kubo
    • Organizer
      79 th Annual Meeting of Society of Vertebrate Paleontology
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dental Microwear Texture Analyses of Extant Ruminants and Triassic Tetrapods2019

    • Author(s)
      Tai Kubo and Mugino O. Kubo
    • Organizer
      1st Asian Palaeontological Congress
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 系統比較法で探る四肢動物の歩行様式の進化:古生物学の視点の重要性2019

    • Author(s)
      久保 泰
    • Organizer
      日本古生物学会169回例会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 系統図から生物地理ネットワークを構築する新手法:白亜紀の陸棲四肢動物への適用2019

    • Author(s)
      久保 泰
    • Organizer
      日本古生物学会第168回例会
    • Related Report
      2018 Research-status Report
  • [Presentation] 白亜紀陸棲脊椎動物の生物地理のネットワーク解析.2018

    • Author(s)
      久保 泰
    • Organizer
      日本進化学会第20回大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 足跡化石から推定されるペルム紀‐三畳紀における陸生四肢動物の姿勢の進化2018

    • Author(s)
      久保 泰
    • Organizer
      第39回バイオメカニズム学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] 岐阜県大白川地域の下部白亜系手取層群より産出した脊椎動物化石(予報)2018

    • Author(s)
      髙津翔平、河部壮一郎、久保貴志、西谷徹、久保泰、宮田和周、薗田哲平、服部創紀、酒井佑輔、松本正樹、東洋一
    • Organizer
      日本古生物学会第167回例会
    • Related Report
      2017 Research-status Report
  • [Presentation] Three dimensional microwear analysis with ISO surface roughness parameters for exploring the domesticated pig in the past2017

    • Author(s)
      Yamada, E., Kubo, M.O., Kubo, T., and Kohno, N
    • Organizer
      77th Annual Meeting, Society of Vertebrate Paleontology
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 体サイズと足形態の関係:小さな恐竜がいない理由2017

    • Author(s)
      久保 泰
    • Organizer
      第七回Tokyo Vertebrate Morphological Meeting
    • Related Report
      2017 Research-status Report
  • [Presentation] Dental microwear texture analysis of extant sika deer with considerations on inter-microscope variability and surface preparation protocols2017

    • Author(s)
      Kubo Mugino O.、Yamada Eisuke、Kubo Tai、Kohno Naoki
    • Organizer
      Workshop on dental biotribology
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] 哺乳類の体重の進化には歩行様式(足の着き方)が関係していた

    • URL

      https://www.u-tokyo.ac.jp/focus/ja/articles/z0508_00083.html

    • Related Report
      2018 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

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