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Three modes of adaptive speciation in spatially structured populations
- Source :
- American Naturalist, American Naturalist, University of Chicago Press, 2013, 182 (6), pp.E215-34. ⟨10.1086/673488⟩, The American Naturalist, The American Naturalist, 2013, 182 (6), pp.E215-34. ⟨10.1086/673488⟩
- Publication Year :
- 2013
- Publisher :
- HAL CCSD, 2013.
-
Abstract
- International audience; 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, then 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 is considerably faster, and both newly formed species go on to coexist in sympatry.
- Subjects :
- Gene Flow
0106 biological sciences
Sympatry
Competitive Behavior
Genetic Speciation
MESH: Population Density
MESH: Selection, Genetic
Population Dynamics
Frequency-dependent selection
Adaptation, Biological
Parapatric speciation
Biology
MESH: Reproduction
Models, Biological
010603 evolutionary biology
01 natural sciences
Ecological speciation
Sexual Behavior, Animal
03 medical and health sciences
Genetic algorithm
Animals
MESH: Animals
Selection, Genetic
MESH: Sexual Behavior, Animal
Ecology, Evolution, Behavior and Systematics
MESH: Gene Flow
030304 developmental biology
Population Density
MESH: Genetic Speciation
0303 health sciences
Disruptive selection
Reproduction
MESH: Adaptation, Biological
[SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE]
Assortative mating
MESH: Models, Biological
MESH: Competitive Behavior
Incipient speciation
MESH: Population Dynamics
Evolutionary biology
Subjects
Details
- Language :
- English
- ISSN :
- 00030147 and 15375323
- Database :
- OpenAIRE
- Journal :
- American Naturalist, American Naturalist, University of Chicago Press, 2013, 182 (6), pp.E215-34. ⟨10.1086/673488⟩, The American Naturalist, The American Naturalist, 2013, 182 (6), pp.E215-34. ⟨10.1086/673488⟩
- Accession number :
- edsair.doi.dedup.....66321b69a416785ee2ea38935991c589