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Evolution of the ribcage morphology in the linage toward birds : a study based on functional morphology and developmental biology

Research Project

Project/Area Number 22840052
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Stratigraphy/Paleontology
Research InstitutionThe Institute of Physical and Chemical Research

Principal Investigator

HIRASAWA Tatsuya  独立行政法人理化学研究所, 形態進化研究グループ, 基礎科学特別研究員 (60585793)

Project Period (FY) 2010 – 2011
Project Status Completed (Fiscal Year 2011)
Budget Amount *help
¥2,886,000 (Direct Cost: ¥2,220,000、Indirect Cost: ¥666,000)
Fiscal Year 2011: ¥1,469,000 (Direct Cost: ¥1,130,000、Indirect Cost: ¥339,000)
Fiscal Year 2010: ¥1,417,000 (Direct Cost: ¥1,090,000、Indirect Cost: ¥327,000)
Keywords主竜類 / 鳥類 / ワニ / 恐竜 / 化石 / 胸郭 / 古脊椎動物学 / 発生生物学 / 進化 / 発生学
Research Abstract

I studied the ribcage development in the extant archosaurs(alligator and chicken), to understand the homologies between the avian-specific ribcage and the ancestral ribcage. In the alligator embryo, the three-segmented rib pattern develops in concordance with the positions of nerves and muscles, suggesting that the difference between this three-segmented and the avian two-segmented patterns is not due to the difference in ossification levels. Analyses on fossils of the Mesozoic theropods demonstrated that the acquisition of the avian two-segmented rib pattern was essential to the respiratory evolution in the lineage toward birds.

Report

(3 results)
  • 2011 Annual Research Report   Final Research Report ( PDF )
  • 2010 Annual Research Report
  • Research Products

    (6 results)

All 2010 Other

All Journal Article (1 results) Presentation (4 results) Remarks (1 results)

  • [Journal Article] 鳥類に至る系統における呼吸器の進化2010

    • Author(s)
      平沢達矢
    • Journal Title

      科学

      Volume: 80(11) Pages: 1091-1097

    • Related Report
      2011 Final Research Report 2010 Annual Research Report
  • [Presentation] Ribcage anatomy, skeletal constraint and kinematics in extant and extinct archosaurs2010

    • Author(s)
      Claessens, L. P. A. M. & T. Hirasawa
    • Organizer
      70th Annual Meeting, Society of Vertebrate Paleontology
    • Place of Presentation
      Pittsburgh, Pennsylvania USA
    • Year and Date
      2010-10-12
    • Related Report
      2011 Final Research Report
  • [Presentation] Ribcage anatomy, skeletal constraint and kinematics in extant and extinct archosaurs2010

    • Author(s)
      Claessens, L., Hirasawa, T.
    • Organizer
      70th Annual Meeting, Society of Vertebrate Paleontology
    • Place of Presentation
      Pittsburgh, USA
    • Year and Date
      2010-10-12
    • Related Report
      2010 Annual Research Report
  • [Presentation] The evolution of ribcage anatomy and breathing function in the Mesozoic theropods2010

    • Author(s)
      Hirasawa, T
    • Organizer
      70th Annual Meeting, Society of Vertebrate Paleontology
    • Place of Presentation
      Pittsburgh, Pennsylvania USA
    • Year and Date
      2010-10-11
    • Related Report
      2011 Final Research Report
  • [Presentation] The evolution of ribcage anatomy and breathing function in the Mesozoic theropods2010

    • Author(s)
      Hirasawa, T.
    • Organizer
      70th Annual Meeting, Society of Vertebrate Paleontology
    • Place of Presentation
      Pittsburgh, USA
    • Year and Date
      2010-10-11
    • Related Report
      2010 Annual Research Report
  • [Remarks] 平沢達矢-中生代獣脚類恐竜から探る鳥類のからだの起源-杉並区立科学館・自然科学ワークショップ「地球環境と生物多様性の変動史」,東京, 2011年2月26日アウトリーチ活動

    • Related Report
      2011 Final Research Report

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Published: 2010-08-27   Modified: 2016-04-21  

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