Figure 2

Study animal and three ecologically divergent sampling sites, representing altitudinal populations with increasing environmental stresses. (a) Plateau zokor, Myospalax baileyi; (b) Low sampling site, L, 2846 m, grassland; (c) Middle sampling site, M, 3282 m, alpine steppe. (d) High sampling site, H, 3714 m, extreme alpine steppe. (e) PCA of the multiple environmental stresses on the three altitudinal populations.