Neighbouring-group composition and within-group relatedness drive extra-group paternity rate in the European badger (Meles meles)
Dugdale, H L
Buesching, C D
Sin, Y W
Macdonald, D W
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CitationAnnavi, G, C Newman, H L Dugdale, C D Buesching, Y W Sin, T Burke, and D W Macdonald. 2014. “Neighbouring-group composition and within-group relatedness drive extra-group paternity rate in the European badger (Meles meles).” Journal of Evolutionary Biology 27 (10): 2191-2203. doi:10.1111/jeb.12473. http://dx.doi.org/10.1111/jeb.12473.
AbstractExtra-group paternity (EGP) occurs commonly among group-living mammals and plays an important role in mating systems and the dynamics of sexual selection; however, socio-ecological and genetic correlates of EGP have been underexplored. We use 23 years of demographic and genetic data from a high-density European badger (Meles meles) population, to investigate the relationship between the rate of EGP in litters and mate availability, mate incompatibility and mate quality (heterozygosity). Relatedness between within-group assigned mothers and candidate fathers had a negative quadratic effect on EGP, whereas the number of neighbouring-group candidate fathers had a linear positive effect. We detected no effect of mean or maximum heterozygosity of within-group candidate fathers on EGP. Consequently, EGP was associated primarily with mate availability, subject to within-group genetic effects, potentially to mitigate mate incompatibility and inbreeding. In badgers, cryptic female choice, facilitated by superfecundation, superfoetation and delayed implantation, prevents males from monopolizing within-group females. This resonates with a meta-analysis in group-living mammals, which proposed that higher rates of EGP occur when within-group males cannot monopolize within-group females. In contrast to the positive meta-analytic association, however, we found that EGP associated negatively with the number of within-group assigned mothers and the number of within-group candidate fathers; potentially a strategy to counter within-group males committing infanticide. The relationship between the rate of EGP and socio-ecological or genetic factors can therefore be intricate, and the potential for cryptic female choice must be accounted for in comparative studies.
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