Host genetics and social relationships jointly shape fitness-associated microbiome variation in a population of feral horses

Gut microbiome variation is consequential for host fitness, but its contribution to adaptive evolution in host populations remains unclear.

Gut microbiome variation is consequential for host fitness, but its contribution to adaptive evolution in host populations remains unclear. Although gut microbiome heritability has been demonstrated in humans, domesticated animals, and wildlife, no study has simultaneously…