Ventilatory physiology of the numbat (<Emphasis Type="Italic">Myrmecobius fasciatus</Emphasis>) |
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Authors: | Email author" target="_blank">C?E?CooperEmail author P?C?Withers |
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Institution: | (1) Zoology, School of Animal Biology M092, University of Western Australia, 6009 Crawley, WA, Australia |
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Abstract: | This study examines the ventilatory physiology of the numbat (Myrmecobius fasciatus), a small to medium-sized (550 g) termitivorous marsupial. Ventilatory parameters at thermoneutrality reflect the slightly low (83% of predicted) basal metabolic rate of the numbat, with ventilation frequency (ƒR; 30.6±3.65 breaths min–1), tidal volume VT; 6.0±0.66 ml at body temperature and pressure, saturated (BTPS)] and consequently minute volume (VI; 117.7±15.22 ml min–1; BTPS) all being 80–87% of that expected for a marsupial of similar body mass. Oxygen extraction was 27.7±1.37% in the thermoneutral zone. As is typical of marsupials, numbats accommodated increased oxygen consumption rates at ambient temperatures (T
a) below the thermoneutral zone by increasing minute volume (up to 411.2±43.98 ml min–1; BTPS at T
a=10 °C) rather than oxygen extraction. Minute volume at 10 °C increased more by changes in ventilation frequency (up to 45.5±4.85 breaths min–1) than tidal volume (9.4±1.03 ml, BTPS), as is also typical for a small-medium sized marsupial.Abbreviations
BMR
basal metabolic rate
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BTPS
body temperature and pressure, saturated
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EO
2
oxygen extraction
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ƒ
R
ventilation frequency
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STPD
standard temperature and pressure, dry
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T
a
ambient temperature
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T
b
body temperature
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TNZ
thermoneutral zone
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V
I
minute volume
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V
T
tidal volume
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O
2
oxygen consumption rate
Communicated by I.D. Hume |
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Keywords: | Numbat Marsupial Tidal volume Respiratory frequency Metabolism |
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