ESM for Watts et al. Stabilising selection on microsatellite allele length from Stabilizing selection on microsatellite allele length at arginine vasopressin 1a receptor and oxytocin receptor loci

Details of model selection procedure (Supplementary Tables 1, 2) and analyses of effect of microsatellite allele length on litter size (Supplementary Methods, Results, Supplementary Table 3).