Fig. 5
Difference in relative reproductive success between siblings within a full-sibling pair as a function of difference in mean mate kinship between the same siblings. In a, the y-axis shows the difference between siblings in number of juvenile offspring. In b, it denotes the difference in lifetime reproductive success. In both panels, reproductive success values are relative to the sibling with the larger mean mate kinship such that values <1 indicate that the sibling with the more closely related mates had fewer offspring. The dashed horizontal line indicates the expectation if kinship has no effect on reproductive success. The blue line illustrates the results of a generalized mixed-effect linear model, where birth year was modeled as a random variable. (See Table 2 for coefficient estimates and other model results)
