Figure 3 . A histogram displaying expected values of relatedness (R xy) among groups of adult Yellowstone Cutthroat trout; (A ) adults assigned progeny via parentage analysis, and (B ) adults without any assigned progeny. Vertical dotted lines correspond to the observed mean levels of relatedness among individuals within a group (Obs mean) and mean expected values of relatedness (Exp mean) generated by randomly shuffling individuals between groups are listed in the upper right of each graph. P-values represent the number of simulations out of the total number ran that were less than or equal to our observed value.