. Bulletin. Science; Natural history; Natural history. Fig. 3. Projections of localities onto the first three principal component axes of variation based on the matrix of correlations of 19 skin and skeletal characters of (A) male and (B) female Dipodomys, (C) 16 temperature characters, and (D) 16 precipitation characters for Baja California. The shortest simply-connected network is superimposed on the principal component space to indicate where pos- sible distortion may be present. Numeral identifications are the same as listed below Figure 1. Also listed in Table 2 are the results of a princ
. Bulletin. Science; Natural history; Natural history. Fig. 3. Projections of localities onto the first three principal component axes of variation based on the matrix of correlations of 19 skin and skeletal characters of (A) male and (B) female Dipodomys, (C) 16 temperature characters, and (D) 16 precipitation characters for Baja California. The shortest simply-connected network is superimposed on the principal component space to indicate where pos- sible distortion may be present. Numeral identifications are the same as listed below Figure 1. Also listed in Table 2 are the results of a principal components analysis of the precipitation data. Figure 3D depicts a plot of these first three components. Prin- cipal component I accounts for of the variation in the precipitation data. Highest loadings on this component were for the November through May, winter, and spring means. The high character loadings for winter means on component 1 is shown in the separation of localities along the first axis. Localities on the left have the least winter rainfall and those on the right the greatest. The second component of precipitation variation represents a relatively high percentage of the variation in the data (). Highest loadings are for July through October, summer, and fall means. Along principal component II the placement of localities 2 through 7 toward the back of the plot, 9, 10, and 11 in the middle, and 1 and 8 at the front appears to be primarily attributable to the summer mean data although the same general grouping of the localities is shown in the fall means (Best 1976, Appendix III). Hastings and Turner (1965) found the Pacific side of the peninsula received its maximum precipitation in winter, and the Gulf of California side received most of its annual moisture during late summer and fall. These data closely agree with my principal components I and II, representing winter-spring and summer-fall precipitation means, respectively. The third component rep
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