Contribution of gular pumping to lung ventilation in monitor lizards
Contribution of gular pumping to lung ventilation in monitor lizards
复制标题
DOI：
10.1126/science.284.5420.1661
复制
发表时间：
1999-06-04
期刊：
影响因子：
56.9
通讯作者：
Brainerd, EL
中科院分区：
文献类型：
--
作者：
Owerkowicz, T;Farmer, CG;Brainerd, EL
一种有争议的假说提出，蜥蜴在中速和高速运动时会受到依赖于速度的轴向限制，从而阻碍了有效的肺通风。结果表明，巨蜥(Varanus属)没有轴向约束，这一假说受到了挑战。这里提供的证据表明，在运动过程中，瓦拉尼德使用正压螺纹泵来辅助肺换气。禁用螺杆泵表明，轴向约束存在于varanids中，但在正常情况下，螺杆泵掩盖了该约束。这些发现支持了这样的预测，即轴向限制可能存在于其他四足动物中，它们通过肋骨吸气呼吸，并以侧向波动步态行走。
A controversial hypothesis has proposed that Lizards are subject to a speed dependent axial constraint that prevents effective Lung ventilation during moderate- and high-speed Locomotion. This hypothesis has been challenged by results demonstrating that monitor lizards (genus Varanus) experience no axial constraint. Evidence presented here shows that, during locomotion, varanids use a positive pressure gular pump to assist Lung ventilation. Disabling the gular pump reveals that the axial constraint is present in varanids but it is masked by gular pumping under normal conditions. These findings support the prediction that the axial constraint may be found in other tetrapods that breathe by costal aspiration and locomote with a lateral undulatory gait.