Fig. 3: Phylogenetic regressions between the thermal environment, and the thermoregulatory behavior and thermal physiology in phrynosomatid lizards.
Influence of mean annual temperature (MAT) on cold tolerance (a; y = 0.354x + 5.639, two-sided P < 0.001, n = 36 oviparous species and 26 viviparous species), field body temperature (b; for oviparous: y = 0.230x + 30.3, two-sided P < 0.001, n = 55, and for viviparous: y = 0.055x + 30.69, two-sided P = 0.4, n = 37), preferred body temperature (c; y = −0.0202x + 35.05, two-sided P = 0.6, n = 47 oviparous species and 32 viviparous species), and heat tolerance (d; y = 0.032x + 41.29, two-sided P = 0.5, n = 37 oviparous species and 26 viviparous species). Solid lines represent slopes with statistical significance (<0.05), and dashed lines represent slopes that are not statistically different from 0. Data are presented as mean values, and 95% confidence bands are included around regression lines. The regression slopes were estimated by phylogenetic regressions (PGLS), and the PGLS results using the other macroclimatic predictors (bio10 and bio11) and operative temperatures (Te) are given in Supplementary Table 4. Parity mode did not impact the relationship between MAT and CTmin (a), Tpref (c), or CTmax (d); therefore, data were combined for oviparous and viviparous species (as indicated by a single gray regression line). By contrast, parity mode impacts the relationship between MAT and Tb (b), as the P-value (0.02) was below the Bonferroni-corrected significance level of 0.025. Source data are provided as a Source Data file.
