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体温の調節は,メソゾーイク時代の海洋爬虫類の体温を調節する
Aurélien Bernard1, Christophe Lécuyer, Peggy Vincent
1CNRS UMR 5125, Paléoenvironnements et Paléobiosphère, Université Lyon 1, Lyon, 2 Rue Raphaël Dubois, 69622 Villeurbanne Cedex, France.
まとめ
イクチオサウル,プレシオサウル,モササウルなどの絶滅した海洋爬虫類は,おそらく温血で,活発な捕食と古代の海で長距離泳ぎのために高い体温を維持していました.
科学分野:
- パレオントロジー・パレオントロジー
- パレオエコロジー (古生態学)
- 生理学 生理学とは
背景:
- 絶滅した脊椎動物の熱調節を理解することは,その生態学と進化にとって極めて重要です.
- メソゾイク期の海洋爬虫類の熱的状態は,ほとんど不明のままである.
- 温度調節は,これらの頂点捕食者の進化の成功に寄与したのかもしれない.
研究 の 目的:
- 絶滅した海洋爬虫類の体温と熱調節戦略を決定する.
- イチオサウルス,プレシオサウルス,モササウルスの熱状態を調査する.
- これらの爬虫類の熱的生理を,共存する魚と比較するために.
主な方法:
- 化石歯のリン酸塩における酸素同位体組成の分析.
- 海洋爬虫類と共存する魚からの歯リン酸同位体の比較.
- 同位体データに基づく体温の再構築.
主要な成果:
- イクチオサウル,プレシオサウル,モササウルは,常に高い体温を維持していた.
- 推定体温は35°Cから39°Cの範囲であった.
- これらの気温は,熱帯から寒冷温帯の海洋環境全体で一貫していました.
結論:
- これらの大型海洋爬虫類は,高い代謝率を示していた.
- エンドサーミーはおそらく彼らの捕食的なライフスタイルと広範なオフショア移住を支えた.
- 温度調節は,彼らの生態学的成功に重要な役割を果たしました.
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