Hybridization and speciation

By R. Abbott, D. Albach, S. Ansell, J. Arntzen, S. Baird, N. Bierne, Janette Boughman, A. Brelsford, C. A. Buerkle, R. J. Buggs and 29 more. Journal of Evolutionary Biology, 2013

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Hybridization has many and varied impacts on the process of speciation. Hybridization may slow or reverse differentiation by allowing gene flow and recombination. It may accelerate speciation via adaptive introgression or cause near‐instantaneous speciation by allopolyploidization. It may have multiple effects at different stages and in different spatial contexts within a single speciation event. We offer a perspective on the context and evolutionary significance of hybridization during speciation, highlighting issues of current interest and debate. In secondary contact zones, it is uncertain if barriers to gene flow will be strengthened or broken down due to recombination and gene flow. Theory and empirical evidence suggest the latter is more likely, except within and around strongly selected genomic regions. Hybridization may contribute to speciation through the formation of new hybrid taxa, whereas introgression of a few loci may promote adaptive divergence and so facilitate speciation. Gene regulatory networks, epigenetic effects and the evolution of selfish genetic material in the genome suggest that the Dobzhansky–Muller model of hybrid incompatibilities requires a broader interpretation. Finally, although the incidence of reinforcement remains uncertain, this and other interactions in areas of sympatry may have knock‐on effects on speciation both within and outside regions of hybridization.

Subfields: Genetics, Plant Science

View Paper: https://www.semanticscholar.org/paper/24267365220dd73a37a9d2a305d6e93bbbbc3145

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Citations in the corpus

Hybridisation on coral reefs and the conservation of evolutionary novelty (2015, background): “The transfer of genetic variation among lineages is an important evolutionary force in many plants (Grant, 1973; Rieseberg and Wendel, 1993) and animals (Lewontin and Birch 1966; Dowling and Secor, 1997; Arnold, 1997; Mallet 2005; Abbott et al. 2013).”
Evaluating the Use of ABBA–BABA Statistics to Locate Introgressed Loci (2014, background): “Hybridization and gene flow between taxa play a major role in evolution, acting as a force against divergence, and as a potential source of adaptive novelty (Abbott et al. 2013).”
A framework for incorporating evolutionary genomics into biodiversity conservation and management (2015, neutral): “[210-213].”
Plant speciation through chromosome instability and ploidy change: Cellular mechanisms, molecular factors and evolutionary relevance (2014, background): “[69] R.”
Hybridization and the species problem in conservation (2015, methodology): “We will not attempt a thorough review (see Coyne and Orr, 2004; Bolnick and Fitzpatrick, 2007; Grant and Grant, 2008; Price, 2008; Fitzpatrick, 2012; Abbott et al., 2013).”
The geography of introgression in a patchy environment and the thorn in the side of ecological speciation (2013, background): “Some authors have therefore suggested that we should abandon the classical parapatric/sympatric dichotomy to integrate divergence on a multidimensional system that accounts for time (history), space (gene flow), evolutionary forces at play (selection versus drift), isolation mechanisms (pre-, post-z”
Ancient hybridization fuels rapid cichlid fish adaptive radiations (2017, neutral): “Such hybridization can be common when allopatric lineages come into secondary contact 4 , and selection against hybrids may be weak during colonization of new environments.”
Hybridization and extinction (2016, background): “…stable hybrid zones, the evolutionary rescue of small inbred populations, the origin and transfer of adaptations, the reinforcement of reproductive isolation, and the formation of new hybrid lineages (Anderson 1949; Ellstrand and Schierenbeck 2000; Mallet 2007; Abbott et al. 2013; Frankham 2015).”