Female house mice avoid fertilization by t haplotype incompatible males in a mate choice experiment.
Bottom Line: This approach enabled us to analyse female behaviour during the testing period, and the resulting paternity success and fitness consequences of a given choice.We show that genetic incompatibilities arising from the t haplotype had severe indirect fitness consequences and t females avoided fertilization by t incompatible males.The results are inconclusive whether this avoidance of t fertilization by t females was caused by pre- or post-copulatory processes.
Affiliation: Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.Show MeSH
Mentions: 34 of 83 mate choice tests (41%) resulted in offspring. Average litter size was 6.11 ± 2.21 (mean ± SD). In t females, litter sizes were significantly lower when mating with a t male than a w male (95% CI for difference between t and w sired litters: [1.24,5.94], z = 2.17, P = 0.030; see Fig. 2). Multiply sired litters on the other hand were not reduced in litter sizes (95% CI for difference between w and multiply sired litters: [−2.04,2.83], z = 0.63, P = 0.528). In w females, litter sizes were also smaller when t sired, but this was not statistically significant (95% CI w vs. t sired: [−0.76,4.11], z = 1.52, P = 0.129; 95% CI w vs. multiply sired: [−4.43,2.55], z = −0.10, P = 0.922).
Affiliation: Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.