  Neutral speciation mechanisms based on isolation by distance and sexual
selection, termed topopatric, have recently been shown to describe the observed
patterns of abundance distributions and species-area relationships. Previous
works have considered this type of process only in the context of hermaphrodic
populations. In this work we extend a hermaphroditic model of topopatric
speciation to populations where individuals are explicitly separated into males
and females. We show that for a particular carrying capacity speciation occurs
under similar conditions, but the number of species generated decreases as
compared to the hermaphroditic case. Evolution results in fewer species having
more abundant populations.
