An analytically tractable model for competitive speciation

Pennings, P.S., Kopp, M., Meszena, G., Dieckmann, U. ORCID:, & Hermisson, J. (2008). An analytically tractable model for competitive speciation. The American Naturalist 171 (1) E44-E71. 10.1086/523952.

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Several recent models have shown that frequency-dependent disruptive selection created by intraspecific competition can lead to the evolution of assortative mating and, thus, to competitive sympatric speciation. However, since most of these results rely on limited numerical analyses, their generality has been debated. Here, we consider one of the standard models (the so-called Roughgarden model) with a simplified genetics where the selected trait is determined by a single diallelic locus. This model is sufficiently complex to maintain key properties of the general multilocus case but simple enough to allow for comprehensive analytical treatment by means of invasion fitness arguments. Depending on (1) the strength and (2) the shape of stabilizing selection, (3) the strength and (4) the shape of pairwise competition, (5) the shape of the mating function, and (6) whether assortative mating leads to sexual selection, we find five different evolutionary regimes. In one of these regimes, complete reproductive isolation can evolve through arbitrarily small steps in the strength of assortative mating. Our approach provides a mechanistic understanding of several phenomena that have been found in previous models. The results demonstrate how even in a simple model, the evolutionary outcome depends in a complex way on ecological and genetic parameters.

Item Type: Article
Uncontrolled Keywords: Assortative mating; Sympatric speciation; Frequency-dependent selection; Invasion fitness; Sexual selection; Population-genetic mode
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: The American Naturalist; 171(1)E44-E71 (January 2008) (Published online 15 November 2007)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:41
Last Modified: 27 Aug 2021 17:20

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