Neutral genetic diversity in mixed mating systems

Systems of reproduction differ with respect to the magnitude of neutral genetic diversity maintained in a population. In particular, the partitioning of reproductives into mating types and regular inbreeding have long been recognized as key determinants of effective population number. Here, the level of neutral genetic diversity is explored across a range of reproductive systems, including full gonochorism, full hermaphroditism, androdioecy, and gynodioecy. For anisogamous organisms in which reproduction is limited by the availability of large gametes and not of small gametes, the relative proportions of gonochores and hermaphrodites affect levels of neutral genetic diversity under androdioecy and gynodioecy in different ways. The influence on the level of genetic diversity of effective number, sex-specific viability differences, and the evolving quantitative trait of the population sex ratio is compared across these systems of reproduction.