Amodel of sympatric speciation by sexual selection. Aquantitative genetic competition model for sympatric speciation. Evolution of dispersal rates in metapopulation models: branching and cyclic dynamics in phenotype space. Evolutionarily singular strategies and the adaptive growth and branching of the evolutionary tree. Can adaptive dynamics invade? Trends Ecol. The dynamical theory of coevolution: a derivation from stochastic ecological processes. ![]() in Stochastic and Spatial Structures of Dynamical Systems (eds van Strien, S. Contingency and determinism in replicated adaptive radiations of island lizards. ![]() Evolutionary history of an adaptive radiation in species pairs of threespine sticklebacks ( Gasterosteus): insights from mitochondrial DNA. Chloroplast DNA variation and the recent radiation of giant senecios (Asteraceae) on the tall mountains of Eastern Africa. Incipient reproductive isolation between two sympatric morphs of the intertidal snail Littorina saxatilis. Experimental evidence that competition promotes divergence in adaptive radiation. Sympatric speciation suggested by monophyly of crater lake cichlids. Monophyletic origin of Lake Victoria cichlid fishes suggested by mitochondrial DNA sequences. Sympatric speciation in animals - new wine in old bottles. Conditions for sympatric speciation: a diploid model incorporating habitat fidelity and non-habit assortative mating. Multilocus model of sympatric speciation III. Essays in Honour of John Maynard Smith (eds Greenwood, P. Skepticism towards Santa Rosalia, or why are there so few kinds of animals? Evolution 35, 124–138 (1981). Laboratory experiments on speciation - what have we learned in 40 years. Press, Cambridge, Massachusetts, 1963).Ĭoyne, J. Animal Species and Evolution (Harvard Univ. Our theory conforms well with mounting empirical evidence for the sympatric origin of many species 10, 11, 12, 13, 14, 15, 16, 17, 18. ![]() When assortative mating depends on a marker trait, and is therefore not directly linked to resource competition, speciation occurs when genetic drift breaks the linkage equilibrium between the marker and the ecological trait. In both cases, evolution of assortative mating often leads to reproductive isolation between ecologically diverging subpopulations. We use multilocus genetics to describe sexual reproduction in an individual-based model, and we consider the evolution of assortative mating (where individuals mate preferentially with like individuals) depending either on an ecological character affecting resource use or on a selectively neutral marker trait. Here we present a model that integrates a novel combination of different features and show that sympatric speciation is a likely outcome of competition for resources. Most previous models analysing sympatric speciation concentrated on particular aspects of the problem while neglecting others 4, 5, 6, 7, 8, 9, 10. In contrast, the possibility of sympatric speciation (in which new species arise without geographical isolation) has often been dismissed, partly because of theoretical difficulties 2, 3. It is believed that many species originated through allopatric divergence, where new species arise from geographically isolated populations of the same ancestral species 1, 2, 3. Understanding speciation is a fundamental biological problem.
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