Three modes of adaptive speciation in spatially structured populations

10707 18 13696 2 24403 document 13696 IR-13-060.pdf application/pdf c82423b9c3b6c811ae021d8ce817e185 MD5 441658 2016-01-15 08:49:45 https://pure.iiasa.ac.at/id/eprint/10707/1/IR-13-060.pdf 10707 1 1 text en public

IR-13-060.pdf

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IR-13-060.pdf

http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/13696 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/13696 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/13696 archive 351 disk0/00/01/07/07 2016-01-15 08:49:45 2021-08-27 17:23:47 2016-01-15 08:49:45 monograph show 3 Rettelbach A. 8442 Kopp M. Dieckmann U. 1668 0000-0001-7089-0393 Hermisson J. Three modes of adaptive speciation in spatially structured populations pub iis_ecl prog_eep Adaptive speciation with gene flow via the evolution of assortative mating has classically been studied in one of two different scenarios. First, speciation can occur if frequency-dependent competition in sympatry induces disruptive selection, leading to indirect selection for mating with similar phenotypes. Second, if a subpopulation is locally adapted to a specific environment, there is indirect selection against hybridizing with maladapted immigrants. While both of these mechanisms have been modeled many times, the literature lacks models that allow direct comparisons between them. Here, we incorporate both frequency-dependent competition and local adaptation into a single model, and investigate whether and how they interact in driving speciation. We report two main results. First, we show that, individually, the two mechanisms operate under separate conditions, hardly influencing each other when one of them alone is sufficient to drive speciation. Second, we also find that the two mechanisms can operate together, leading to a third speciation mode, in which speciation is initiated by selection against maladapted migrants, but completed by within-deme competition in a distinct second phase. While this third mode bears some similarity to classical reinforcement, it happens considerably faster, and both newly formed species go on to coexist in sympatry. KEYWRODS: parapatric speciation, adaptive speciation, assortative mating, frequency dependent selection, reinforement, local adaptation 2013 published IR-13-060 IR-13-060 1532 66 public interim_report IIASA, Laxenburg, Austria 52 FALSE info:eu-repo/semantics/book