モニタートカゲの肺換気に対するガラーポンプの貢献
T Owerkowicz1, C G Farmer, J W Hicks
1Museum of Comparative Zoology, Harvard University, Cambridge, MA 02138, USA. towerkow@oeb.harvard.edu
Science (New York, N.Y.)
|June 5, 1999
まとめ
ワニは,急速な動きの間に,隠された呼吸の制約があるかもしれません. モニタートカゲは,この軸上の制約を克服するために喉ポンプを使用し,このポンプが無効になったときに明らかになります.
科学分野:
- 比較生理学 比較生理学について
- バイオメカニクス バイオメカニクス
- 脊椎動物の呼吸器系は
背景:
- 提案された速度に依存する軸関節制約は,移動中のトカゲの肺換気を制限する.
- 以前の研究では,モニタートカゲ (ヴァラヌス) にこの軸の制約がないことが示唆されていた.
- 喉ポンプ (喉ポンプ) は,いくつかのトカゲの呼吸機構として知られている.
研究 の 目的:
- 移動中のバルナイド肺換気におけるガラーポンプの役割を調査する.
- ヴァラニッドに軸の制約が存在し,それがどのように管理されているかを判断する.
主な方法:
- ワラニドの運動と呼吸パターンの観察.
- プラスの圧力ガラーポンプメカニズムの実験的な無効化.
- 肺の換気効果の評価 喉頭ポンプ付き・無付属.
主要な成果:
- ヴァラニッドは,移動中に肺の換気を助けるために,正圧ガラーポンプを使用しています.
- ガラーポンプを無効にすると,ヴァラニドの速度に依存する軸上の制約が明らかになった.
- グラーポンプは,正常な移動下での軸上の制約を効果的にマスクします.
結論:
- 軸の制約はヴァラニッドに存在するが,ガラーポンプによって補償される.
- この発見は,類似の動きと呼吸を持つ他の四足類にもこの制約があるかもしれないという仮説を支持する.
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