کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1974188 1060342 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The cost of ventilation in birds measured via unidirectional artificial ventilation
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
The cost of ventilation in birds measured via unidirectional artificial ventilation
چکیده انگلیسی

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 O2 (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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 155, Issue 2, February 2010, Pages 146–153
نویسندگان
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