In search of the Goldilocks zone for hybrid speciation

摘要: Hybridization has recently gained considerable interest both as a unique window for observing speciation mechanisms and potential engine of speciation. The latter remains controversial topic. It been hypothesized that the reciprocal sorting genetic incompatibilities from parental species could result in hybrid speciation, when population maintains mixed combination prevents further gene exchange with populations. However, specifics purging/sorting process multiple have not examined theoretically. We here investigate allele-frequency dynamics an isolated results single hybridization event. Using models 2 or 4 loci, we fate one two Dobzhansky-Muller type (DMIs). study how various parameters affect sorting/purging DMIs probability by sorting. find is strongly dependent on architecture (i.e. order recombination distance between loci along chromosomes), size population, initial relative contribution populations to population. identify Goldilocks zone specific architectures intermediate rates, which becomes highly probable. While equal maximizes zone, other yield asymmetric maxima are unintuitive first sight. provide explanation this pattern, discuss our respect best conditions nature their implications patterns introgression zones.