期刊
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
卷 155, 期 2, 页码 146-153出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cbpa.2009.10.023
关键词
Numida meleagris; Metabolism; Ventilation; Running; Unidirectional artificial ventilation
资金
- National Science Foundation [IBN-0212141, IOS-0817782]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0817782] Funding Source: National Science Foundation
The highly derived mechanism birds use to ventilate their lungs relies on dorsoventral excursions of their heavily muscled sternum and abdominal viscera. Our expectation of the level of mechanical work involved in this mechanism led us to hypothesize that the metabolic cost of breathing is higher in birds than in other tetrapods. To test this theory, we used unidirectional artificial ventilation (UDV) to stop normal ventilatory movements in guinea fowl (Numida meleagris L) at rest and during treadmill locomotion at three speeds. Oxygen consumption was measured during normal breathing and UDV, and the difference was used to approximate the cost of ventilation. Contrary to our prediction, metabolism increased when ventilatory movements ceased during UDV at rest. Although we do not understand why this occurred we suspect that UDV induced a homeostatic mechanism to counteract the loss of carbon dioxide. Nevertheless. across all running speeds, metabolism decreased significantly with UDV, indicating a minimum cost of ventilation during running of 1.43 +/- 0.62% of total running metabolism or 0.48 +/- 0.21 mL O-2 (L ventilated)(-1). These results suggest that the metabolic cost of ventilation is low in birds and that it is within the range of costs reported previously for other amniotes. Published by Elsevier Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据