Figure 2.

Male extra-pair and within-pair siring success. Adult male F₁ EPO (black bars) sired significantly more F₂ EPO than did male F₁ WPO (white bars), but they did not differ in the number of F₂ WPO they sired. Among males whose social mates produced at least one genotyped offspring (n = 27), male F₁ EPO did not differ from F₁ WPO in the number of their social offspring that were lost to extra-pair paternity (EPP). In all cases, bars represent uncorrected means ± s.e.m.; for full model details see electronic supplementary material, tables S4 and S6. Asterisks indicate significance at p < 0.05.