The functional significance of ventilation frequency,and its relationship to oxygen demand in the resting brown long-eared bat,Plecotus auritus |
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Authors: | P I Webb G C Hays J R Speakman P A Racey |
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Institution: | (1) Department of Zoology, University of Aberdeen, AB9 2TN Aberdeen, UK |
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Abstract: | Summary Mean oxygen consumption and simultaneous ventilation frequency of nine non-reproductive brown long-eared bats (body mass 8.53–13.33 g) were measured on 159 occasions. Ambient (chamber) temperature at which the measurements were made ranged from 10.8 to 41.1°C. Apneic ventilation occurred in 22 of the 59 measurements made when mean oxygen consumption was less than 0.5 ml·min-1. No records of apneic ventilation were obtained when it was over 0.5 ml·min-1. The relationship between ventilation frequency and mean oxygen consumption depended on whether ventilation was apneic or non-apneic. When ventilation was non-apneic the relationship was positive and log-linear. When ventilation was apneic the relationship was log-log. Within the thermoneutral zone ventilation frequency was not significantly different from that predicted from allometric equations for a terrestrial mammal of equivalent body mass, but was significantly greater than that predicted for a bird. A reduction in the amount of oxygen consumed per breath occurred at ambient temperatures above the upper critical temperature (39°C).Abbreviations RH
relative humidity
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T
a
chamber temperature
- vf
ventilation frequency
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VO2
oxygen consumption |
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Keywords: | Ventilation frequency Oxygen consumption Apnea Respirometry Bat Plecotus auritus |
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