not-yet-known not-yet-known not-yet-known unknown Figure 2 : Experimental conditions for egg incubation. Eggs in the shaded treatment were incubated in (a) organic soil from the shaded island, and those in the open treatment were incubated in (b) shell substrate from the open island. (c) Water retention curves for soil types from each island. Water potential was measured at multiple water contents of the substrate (% water by mass), and eggs were incubated at water potentials of at -30 kPa and -150 kPa for the shaded and open treatments, respectively. (d) Nest temperatures in open and shaded locations on an island near our study site (Pruett et al. 2020). Our incubators were programmed to mimic these thermal profiles. Blue and red lines represent shaded and open nest sites, respectively.