Abstract
The Pseudophyte Evolutionary Algorithm (PEA) is an individual-based computer model of a population of haploid, annual plants used to examine the process of speciation in a patchy environment. The model incorporated both pre-mating and post-zygotic mechanisms for the evolution of reproductive isolation via pollen selection and offspring inviability, respectively. The PEA allows speciation as an emergent property rather than an explicit feature of the model to understand how environmental patchiness, number and arrangement of loci, and reproductive output of individuals affected the strength of isolating mechanisms as well as the rate at which these evolve. The effect of how genotypes were mapped to phenotypes was also explored to examine the sensitivity of the PEA to alternate representations.