The goal of this project was to investigate whether the cross-shelf gradient (nearshore - offshore - deep) is associated with spatially varying selection in two common coral species, Montastraea cavernosa and Siderastrea siderea, in the Florida Keys. Toward this end, we used 2bRAD to genotype 20 juveniles and 20 adults of both species from each of the three reef zones to identify signatures of selection occurring within a single generation.