Egg mass and survival:
Egg masses at the two southern populations (AP and WO) were greater relative to the two northern populations (SR and YK), but only a nearly significant difference was observed between SR and WO (β = -11.98, t = -2.57, p = 0.073; Figure 1B). Whereas hatch rates were lower at 29.5°C (59.2%) compared to 33.5°C (82.9%; β = 1.12, z = 2.08, p = 0.038), differences were not observed between sites at either temperature (all pairwise p > 0.23). There were also no differences in survival between sites (all pairwise p =1) or temperatures (p = 1) during the 10-day growth period, with 79 (94%) and 114 (94%) animals surviving at 29.5°C and 33.5°C, respectively. Final sample sizes of surviving individuals by temperature, clutch, and site are shown in Table 1.