FIGURE 8.

Results of a principal components analysis (PCA) summarizing body size, growth, and reproductive data among three lizard populations along the latitudinal thermal gradient (warm, cool, and cold). Principal component one (PC 1) was comprised of high loadings for snout–vent length, postoviposition mass, eggs per clutch, and clutch mass. Principal component 2 (PC 2) was comprised of high loadings for weekly growth rate and average egg mass (Table 4). The PCA was employed with Promax rotation because the components were assumed to be partially correlated. Points reflect average PC scores across individuals from each population and error bars represent ±1 SE.