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Rapid parapatric speciation on holey adaptive landscapes
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Rapid parapatric speciation on holey adaptive landscapes   (Citations: 56)
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A classical view of speciation is that reproductive isolation arises as a by-product of genetic divergence. Here, individual-based simulations are used to evaluate whether the mechanisms implied by this view may result in rapid speciation if the only source of genetic divergence are mutation and random genetic drift. Distinctive features of the simulations are the consideration of the complete process of speciation (from initiation until completion), and of a large number of loci, which was only one order of magnitude smaller than that of bacteria. It is demonstrated that rapid speciation on the time scale of hundreds of generations is plausible without the need for extreme founder events, complete geographic isolation, the existence of distinct adaptive peaks or selection for local adaptation. The plausibility of speciation is enhanced by population subdivision. Simultaneous emergence of more than two new species from a subdivided population is highly probable. Numerical examples relevant to the theory of centrifugal speciation and to the conjectures about the fate of ``ring species'' and ``sexual continuums'' are presented.
Journal: Proceedings of The Royal Society B: Biological Sciences , vol. 265, no. 1405, pp. 1483-1489, 1998
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    • ...Theoretically, the expansion of populations around geographic barriers should be a relatively common occurrence and the potential development of a ring species complex should follow, however, the paucity of examples suggests that these complexes are biologically unstable [10], [18] or the criteria (i.e...

    Daniel Ashlock, et al. Transience in the simulation of ring species

    • ...Low levels of gene exchange may facilitate selection by increasing genetic variation in fragmented populations (Gavrilets et al . 1998; Church & Taylor 2002)...

    K. PETREN, et al. Comparative landscape genetics and the adaptive radiation of Darwin's ...

    • ...On the one hand, it is possible that the Asian and Pacific subspecies arose by a parapatric mechanism with steppingstone population structure (Barton & Hewitt, 1985; Gavrilets et al., 1998, 2000), and that New Guinea and Northeastern Australia are the zones of permanent range overlap...

    Artyom Kopp, et al. Speciation in Progress? A Continuum of Reproductive Isolation in Droso...

    • ...Several models have been developed just to account for the different routes to speciation [71, 72, 73, 74, 75, 76, 77, 78, 79]...

    Debashish Chowdhury, et al. Evolutionary ecology in-silico: Does mathematical modelling help in un...

    • ...Other modelling studies based on the a ssumption of existence of ‘ridges’ of highly fit gen otypes (Dobzhansky 1937; Gavrilets et al 1998) that connect neighbouring adaptive peaks, suggest either indepen dence of speciation rates from total popul ation size (Orr and Orr 1996) or higher speciation rates in large popul ations with large geographic ranges (Gavrilets et al 1998)...
    • ...Other modelling studies based on the a ssumption of existence of ‘ridges’ of highly fit gen otypes (Dobzhansky 1937; Gavrilets et al 1998) that connect neighbouring adaptive peaks, suggest either indepen dence of speciation rates from total popul ation size (Orr and Orr 1996) or higher speciation rates in large popul ations with large geographic ranges (Gavrilets et al 1998)...

    Anastassia M. Makarieva, et al. On the dependence of speciation rates on species abundance and charact...

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