Figure 3.

High-altitude deer mice (Peromyscus maniculatus) have higher aerobic capacities under hypoxia in comparison with lowland conspecifics. Performance capacities under hypoxia were measured as the maximal rate of O₂ consumption $\left(\dot{\text{V}}{\text{O}}_{2\max }\right)$ during thermogenesis or exercise. The absolute $\dot{\text{V}}{\text{O}}_{2\max }$ data (in units of mL/min) were corrected for body mass using a residual approach (see Lui et al. 2015 and Tate et al. 2017 for details) and are here divided by the body mass of an average-sized mouse (data represent means ± SE). Significant main effects of native elevation and hypoxia acclimation are denoted by * and †, respectively, in two-way analysis of variance (P < 0.05).