Ventilatory and metabolic responses of a bat,Phyllostomus discolor,to hypoxia and CO2: implications for the allometry of respiratory control |
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Authors: | J P Walsh D F Boggs D L Kilgore Jr |
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Institution: | (1) Division of Biological Sciences, University of Montana, 59812 Missoula, MT, USA |
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Abstract: | The ventilatory and metabolic responses of lesser spear-nosed bats to hypoxia and hypercapnia were measured to determine whether
these corresponded to preliminary allometries and a positive relationship between hypoxic ventilatory threshold andP
50. Ventilatory responses of lesser spear-nosed bats to 3, 5 and 7% CO2 differed significantly from ventilation on air and each other. The magnitude of their ventilatory response to CO2 is consistent with the prediction of a smaller ventilatory response to hypercapnia in small compared to large mammals
; Williams et al. (1994)]. Among 12, 10 and 8% O2 treatments only the ventilatory response to 8% O2 differed significantly from ventilation on air or the other treatments. Metabolic rate was significantly reduced at both
10 and 8% O2. The hypoxic ventilatory response of these bats does not support the prediction of a greater response in small compared to
large mammals
; Boggs and Tenney (1984)]. Their metabolic response is consistent with the hypoxic hypometabolism typical of small mammals,
though not of comparable magnitude. The response, expressed as percent change in convection requirement (
), is also less than that observed in other small mammals. This relative insensitivity to hypoxia may be associated with this
bat's unusually high affinity hemoglobin (P50=27.5 torr). |
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Keywords: | Ventilation Metabolism Bats Hypoxia Hypercapnia |
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