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.