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Simulations of flowering time displacement between two cytotypes that form inviable hybrids

TitleSimulations of flowering time displacement between two cytotypes that form inviable hybrids
Publication TypeJournal Article
Year of Publication1994
AuthorsVanDijk, PJ, Bijlsma, R
JournalHeredity
Page range522-535
Abstract

The evolution of reproductive isolation by flowering time displacement between two cytotypes that produce inviable hybrids was studied by computer simulations in an isolation-by-distance model. Flowering time distribution was stabilized by mass-action, both by the mating procedure and by pollen-limited seed-production in early or late flowering plants. Coexistence had to last long enough for flowering time divergence to evolve. This could only be achieved in a mosaic of local patches or parapatry. The model showed that flowering time displacement occurred despite the stabilizing effect of mass-action and the restricted width of the interaction zone. Initially an inverse cline for flowering time was formed but after 200 generations this cline had become monotonic. In contrast to the possible swamping effect by gene flow from outside the zone, there was a spread of genes into the allopatric ranges.

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