Fig. 4 in Systematics of the Smooth-Toothed Pocket Gopher, Thomomys umbrinus, in the Mexican Transvolcanic Belt

Fig. 4. Distribution of populations of Thomomys umbrinus along the Mexican Transvolcanic Belt in multivariate space, according to sex (♀/3) and age (2–4). Notice that Thomomys umbrinus pullus, when present, always separated from other samples and that the position of the samples is variable in each sex and age. Axes and spheres indicate the position of group localities with respect to Principal Components Analyses computed on the population means. Lines connecting group localities result from a Minimum Spanning Tree projected onto the first principal components (I-III). Percentages refer to the amount of variation explained by each principal component. Discontinuous lines indicate groups according to Cluster Analyses developed in the sample means (r = cophenetic coefficient for the phenograms; n = sample size). Mantel's Z tests (r = correlation; p = significance) and arrows indicate comparability between phenograms. See names of group localities (letters) in table 1. Diagrams were drawn with the same scale and are rotated to different degrees for the sake of clarity.