Hayes J P
Department of Biology, University of California, Riverside 92521.
J Comp Physiol B. 1989;159(4):453-9. doi: 10.1007/BF00692417.
I compared the maximal aerobic metabolic rates (VO2max), field metabolic rates (FMR), aerobic reserves (VO2max-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, VO2max, 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 VO2max, FMR, and aerobic reserve, but not BMR. BMR was correlated with VO2max, but not with FMR. The significant positive correlation of BMR with VO2max indicates a cost of high VO2max, because higher BMR increases food requirements and energy use during periods of thermoneutral conditions.
我比较了来自低海拔（440米）和高海拔（3800米）的野生及刚捕获的鹿鼠的最大有氧代谢率（VO2max）、野外代谢率（FMR）、有氧储备（VO2max - FMR）和基础代谢率（BMR）。为了将热环境的影响与其他海拔影响区分开来，我研究了来自不同海拔但热环境相似的小鼠（即高海拔的夏季小鼠和低海拔的冬季小鼠）。当热环境相似时，低海拔和高海拔小鼠的VO2max、FMR和有氧储备没有差异，但高海拔地区的BMR显著更高。因此，在没有热差异的情况下，海拔对野生或刚捕获的鹿鼠的有氧代谢只有微小影响。在低海拔地区，VO2max、FMR和有氧储备存在显著的季节性变化，但BMR没有。BMR与VO2max相关，但与FMR无关。BMR与VO2max的显著正相关表明高VO2max存在成本，因为更高的BMR会增加热中性条件下的食物需求和能量消耗。
