Fig. 2.

High-elevation deer mice (Peromyscus maniculatus) have higher aerobic capacities in hypoxia in comparison to lowland conspecifics. Performance capacities in hypoxia were measured as the maximal rate of O₂ consumption (VO_2max) during thermogenesis (A) or exercise (B). The absolute VO_2max 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 ANOVA (P < 0.05).