Speciation: More Likely through a Genetic or through a Learned Habitat Preference?

Beltman JB & Metz JAJ (2005). Speciation: More Likely through a Genetic or through a Learned Habitat Preference? IIASA Interim Report. IIASA, Laxenburg, Austria: IR-05-072

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Abstract

A problem in understanding sympatric speciation is establishing how reproductive isolation can arise when there is disruptive selection on an ecological trait. One of the solutions that has been proposed is that a habitat preference evolves, and that mates are chosen within the preferred habitat. We present a model where the habitat preference can evolve either by means of a genetic mechanism or by means of learning. Employing an adaptive-dynamical analysis, we show that evolution proceeds either to a single population of specialists with a genetic preference for their optimal habitat, or to a population of generalists without a habitat preference. The generalist population subsequently experiences disruptive selection. Learning promotes speciation because it increases the intensity of disruptive selection. An individual-based version of the model shows that, when loci are completely unlinked and learning confers little cost, the presence of disruptive selection most likely leads to speciation via the simultaneous evolution of a learned habitat preference. However, the latter only happens when the effect of mutation is large, or when there is linkage between genes coding for the different traits.

Item Type: Monograph (IIASA Interim Report)
Research Programs: Adaptive Dynamics Network (ADN)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 02:18
Last Modified: 06 Nov 2016 19:41
URI: http://pure.iiasa.ac.at/7770

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