Latitudinal Clines in an Ectothermic Vertebrate: Patterns in Body Size, Growth Rate, and Reproductive Effort Suggest Countergradient Responses in the Prairie Lizard.

Mass across populations was explained by SVL ( R 2 = 0.874, F 1,97 = 419.864, p < 0.001), with differences in body condition only marginally significant ( F 6,97 = 2.007, p = 0.072). 3.2 Laboratory Experiment 3.2.1 Body Size and Growth Rates Among the subset of three populations examined for latitudinal variation in reproductive characteristics and intrinsic growth rate, we found significant differences in SVL, mass, and body condition (SVL: Brown–Forsythe F 2,26 = 3.816, p = 0.035; mass: Brown–Forsythe F 2,26 = 32.866, p = 0.009; body condition: SVL, F 1,48 = 312.896, p < 0.001; and population, F 2,48 = 3.487, p = 0.039; Figure 3 ).

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