Overall genetic structure
Principal coordinates analysis (PCoA) of retained samples based on pairwise identity-by-state did not identify any significantly genetically distinct population:age groups (PERMANOVA p> 0.1, Fig. 1 E). Lack of genetic differentiation between adults indicates that, on the island scale larval dispersal and recruitment are unrestricted, as is expected for broadcast-spawning corals (Davies et al. 2015). Yet, we don’t have support for the first prediction of the SRS, that juveniles would show some genetic structure, or “chaotic genetic patchiness” sensu(Johnson and Black 1982), due to different parents “winning the sweepstakes” at different locations.