Figure 1.

Distribution of the 1,000 bootstraped Internal Relatedness IR (A), pairwise-relatedness r (B) and MHC allele-sharing (C). IRobs_, IRobs_within-pair and IRobs_extra-pair correspond to the observed IR computed on the entire sample of chicks, chicks produced by social males and chicks produced by extra-pair males, respectively. robs_social, Dobs_social correspond to the observed r and allele-sharing between the female and her social mate. robs_genetic, Dobs_genetic corresponds to the observed r and allele-sharing between the female and her extra-pair mate.