Altitudinal and seasonal effects on aerobic metabolism of deer mice |
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Authors: | Jack P Hayes |
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Institution: | (1) Department of Biology, University of California, 92521 Riverside, California, USA;(2) Present address: Department of Zoology, University of Wisconsin, 53706 Madison, Wisconsin, USA |
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Abstract: | Summary I compared the maximal aerobic metabolic rates (
), field metabolic rates (FMR), aerobic reserves (
-FMR), and basal metabolic rates (BMR) of wild and recently captured deer mice from low (440 m) and high (3800 m) altitudes. To separate the effects of the thermal environment from other altitudinal effects, I examined mice from different altitudes, but similar thermal environments (i.e., summer mice from high altitude and winter mice from low altitude). When the thermal environment was similar,
, FMR, and aerobic reserve of low and high altitude mice did not differ, but BMR was significantly higher at high altitude. Thus, in the absence of thermal differences, altitude had only minor effects on the aerobic metabolism of wild or recently captured deer mice.At low altitude, there was significant seasonal variation in
, FMR, and aerobic reserve, but not BMR. BMR was correlated with
, but not with FMR. The significant positive correlation of BMR with
indicates a cost of high
, because higher BMR increases food requirements and energy use during periods of thermoneutral conditions.Abbreviations
BMR
basal metabolic rate
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FMR
field metabolic rate
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partial pressure of oxygen
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T
a
ambient temperature
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T
b
body temperature
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T
e
operative temperature
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maximal aerobic metabolic rate |
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Keywords: | Altitude Basal metabolic rate Deer mice Field metabolic rate Maximal metabolic rate |
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