オーニチスキー類の恐竜の代謝率が中等または高かったことを示す心臓血管学的証拠
P E Fisher1, D A Russell, M K Stoskopf
1Biomedical Imaging Facility, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, NC 27606, USA. PaulvFisher@ncsu.edu
まとめ
化石化したCTスキャンは,オルニチスキア恐竜には4室の心臓と1つの大動脈があったことを示唆しています. この発見は,恐竜が中高の代謝率を有していた可能性を示し,以前の仮定に異議を唱えた.
科学分野:
- パレオントロジー・パレオントロジー
- 比較解剖学 比較解剖学とは
- 進化生物学の進化生物学について
背景:
- 絶滅した恐竜の心臓血管系はほとんど解明されていない.
- 以前の研究では,恐竜の生理学を,その爬虫類の親戚から推測することが多かった.
研究 の 目的:
- オルニティスキー族の恐竜から採取した鉄状の固体の内部構造を調査する.
- オーニチスキー類の恐竜の心血管解剖学と代謝能力を推測する.
主な方法:
- コンピュータトモグラフィー (CT) スキャニングは,鉄質のコンクリエーションを分析するために使用されました.
- 潜在的な臓器の印を特定するために,コンクリートの内部特性の構造分析.
主要な成果:
- CTスキャンでは,4室の心臓と一致する構造が明らかになった.
- 単一の全身大動脈の証拠もコンクリエーション内で特定されました.
- これらの心血管の特徴は,これまで考えられていたより複雑で効率的な循環系を示唆しています.
結論:
- オルニチスキア恐竜の推論された心血管系は,中高の代謝率の仮説を支持する.
- この発見は,恐竜の生理学,行動,進化の経路を理解する上で重要な意味を持つ.
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