Ventilation and oxygen consumption in rosy finches and house finches at sea level and high altitude |
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Authors: | Daniel T Clemens |
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Institution: | (1) Department of Biology, University of California, 90024 Los Angeles, California, USA |
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Abstract: | Summary Rosy finches (Leucosticte arctoa) breed at altitudes above 3500 m in eastern California. House finches (Carpodacus mexicanus) belong to the same subfamily (Carduelinae), but breed at much lower elevations. Oxygen consumption (
) and ventilatory parameters of these two species were measured over a wide range of ambient temperatures (T
a) at low altitude (LA; 150 m) and at high altitude (HA; 3800 m).Minimal nighttime
's of rosy finches and house finches at LA (T
a=30°C) were close to allometrically predicted values for passerine birds. At both altitudes,
increased linearly with decreasingT
a betweenT
a=20 and –10°C. Resting
's were slightly higher at HA than at LA on average.In both species, minute volume (
) was inversely related toT
a.T
a-correlated increases in
resulted from significant increases in both ventilatory frequency (f) and tidal volume (V
T) at both altitudes. Oxygen extraction efficiency (
) was independent ofT
a in rosy finches at LA, but declined significantly with decreasingT
a in rosy finches at HA and in house finches at both altitudes.At a givenT
a, both species had significantly greater
(BTPS) at HA than at LA. Altitude-correlated increases in
resulted primarly from increases inf with little change inV
T.
was significantly greater at HA than at LA in both species.In spite of the difference in altitudinal distributions of rosy finches and house finches, there were few conspicuous interspecific differences in metabolic or ventilatory adaptation to altitude or lowT
a over the range of conditions examined.Symbols and abbreviations
BMR
basal metabolic rate
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BTPS
at body temperature and pressure, saturated
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oxygen extraction efficiency
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f
ventilation frequency
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h
mean coefficient of heat transfer
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HA
high altitude
-
instantaneous oxygen consumption
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LA
low altitude
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RH
relative humidity
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SMR
standard metabolic rate
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STPD
standard temperature and pressure, dry
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T
temperature
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a
ambient
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b
body
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lc
lower critical of thermoneutral zone
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minute volume
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V
T
tidal volume |
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Keywords: | |
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