Transitions between phases of genomic differentiation during stick-insect speciation

Riesch, Rüdiger; Muschick, Moritz; Lindtke, Dorothea; Villoutreix, Romain; Comeault, Aaron A.; Farkas, Timothy E.; Lucek, Kay; Hellen, Elizabeth; Soria‐Carrasco, Víctor; Dennis, Stuart R.; Carvalho, Clarissa F. de; Safran, Rebecca J.; Sandoval, Cristina P.; Feder, Jeff; Gries, Regine; Crespi, Bernard J.; Gompert, Zachariah; Nosil, Patrik

doi:10.1038/s41559-017-0082

Cited by 168 publications

(256 citation statements)

References 82 publications

Supporting

Mentioning

223

Contrasting

Order By: Relevance

“…This variation exists in the context of likely secondary contact among Catostomus species, whereas variation might exist in other systems that have undergone primary divergence, among populations that have evolved isolation to different extents (Riesch et al. ; Stuart et al. ).…”

Section: Discussionmentioning

confidence: 99%

Inconsistent reproductive isolation revealed by interactions betweenCatostomusfish species

et al. 2017

View full text Add to dashboard Cite

Interactions between species are central to evolution and ecology, but we do not know enough about how outcomes of interactions between species vary across geographic locations, in heterogeneous environments, or over time. Ecological dimensions of interactions between species are known to vary, but evolutionary interactions such as the establishment and maintenance of reproductive isolation are often assumed to be consistent across instances of an interaction between species. Hybridization among Catostomus fish species occurs over a large and heterogeneous geographic area and across taxa with distinct evolutionary histories, which allows us to assess consistency in species interactions. We analyzed hybridization among six Catostomus species across the Upper Colorado River basin (US mountain west) and found extreme variation in hybridization across locations. Different hybrid crosses were present in different locations, despite similar species assemblages. Within hybrid crosses, hybridization varied from only first generation hybrids to extensive hybridization with backcrossing. Variation in hybridization outcomes might result from uneven fitness of hybrids across locations, polymorphism in genetic incompatibilities, chance, unidentified historical contingencies, or some combination thereof. Our results suggest caution in assuming that one or a few instances of hybridization represent all interactions between the focal species, as species interactions vary substantially across locations.

show abstract

Section: Discussionmentioning

confidence: 99%

Inconsistent reproductive isolation revealed by interactions betweenCatostomusfish species

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Note that F st and mean nucleotide diversity are expected to be uncorrelated with each other when demographic factors (e.g., gene flow, genetic drift) outweigh the effect of mutations, whereas a negative correlation is expected between these measures in the opposite situation 63 . Meanwhile, the nucleotide divergence d xy , which is considered a more appropriate measure of population differentiation 61 , was strongly positively correlated with nucleotide diversity and hence may lead to false discovery of elevated d xy at regions with high nucleotide diversity 64 (Supplementary Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

Triplicate parallel life cycle divergence despite gene flow in periodical cicadas

et al. 2018

View full text Add to dashboard Cite

Periodical cicadas comprise three species groups containing three pairs of 13- and 17-year life cycle species showing parallel divergence, along with a more anciently diverged 13-year species (Magicicda tredecim). The mechanism and genetic basis of this parallel divergence is unknown. Here we use orthologous transcriptome sequences to explore the demographic processes and genomic evolution associated with parallel life cycle divergence. The three 13- and 17-year species pairs have similar demographic histories, and the two life cycles diverged 200,000–100,000 years ago. Interestingly, these life cycle differences have been maintained despite substantial gene flow between 13- and 17-year species within species groups, which is possible during co-emergences. Sequence divergence between 13- and 17-year species in each species group (excluding M. tredecim) is minimal, and we find no shared divergent single-nucleotide polymorphisms (SNPs) or loci associated with all instances of life cycle divergence. The two life cycles may be controlled by highly limited genomic differences.

show abstract

“…The combination of these factors will shape the patterns of genomic differentiation and determine how coupling progresses as speciation unfolds (Feder et al 2012a;Flaxman et al 2013Flaxman et al , 2014, with the possibility of an abrupt transition in coupling from weak local genomic barriers around individual loci to a strong genome-wide barrier (i.e., genome-wide congealing; Flaxman et al 2013;Feder et al 2014;Nosil et al 2017) corresponding to the critical value of the coupling coefficient of Barton (1983), at which overall selection outweighs the impact of recombination. In addition to multilocus clinal analyses mentioned above, we are starting to see evidence for the expected disjunction in genome-wide comparisons across multiple levels of divergence (Riesch et al 2017). If there are transitions between phases on the route to speciation, then coupling is likely to be a key process in what Riesch and colleagues call "alignment of multifaceted aspects of differentiation" (p. 1).…”

Section: Distinguishing Among Coupling Processesmentioning

confidence: 99%

“…However, comparative analyses may also represent an important way forward. Since the temporal progression of speciation can only rarely be studied in real time, a promising direction is to compare populations at different stages of divergence in a system Shaw and Mullen 2014;Riesch et al 2017). This approach can help to reconstruct how genomic differentiation and coupling among barrier effects progress during speciation, assess whether the evolution of coupling and genome congealing (Barton 1983;Flaxman et al 2013 of chromosomal linkage and recombination rate variation in the evolution of coupling (e.g., Gagnaire et al 2013;Nadeau et al 2013;Burri et al 2015;Feulner et al 2015).…”

Section: Distinguishing Among Coupling Processesmentioning

confidence: 99%

Coupling, Reinforcement, and Speciation

Butlin

Smadja

2018

The American Naturalist

183

250

View full text Add to dashboard Cite

During the process of speciation, populations may diverge for traits and at their underlying loci that contribute barriers to gene flow. These barrier traits and barrier loci underlie individual barrier effects, by which we mean the contribution that a barrier locus or trait-or some combination of barrier loci or traits-makes to overall isolation. The evolution of strong reproductive isolation typically requires the origin of multiple barrier effects. Critically, it also requires the coincidence of barrier effects; for example, two barrier effects, one due to assortative mating and the other due to hybrid inviability, create a stronger overall barrier to gene flow if they coincide than if they distinguish independent pairs of populations. Here, we define "coupling" as any process that generates coincidence of barrier effects, resulting in a stronger overall barrier to gene flow. We argue that speciation research, both empirical and theoretical, needs to consider both the origin of barrier effects and the ways in which they are coupled. Coincidence of barrier effects can occur either as a by-product of selection on individual barrier effects or of population processes, or as an adaptive response to indirect selection. Adaptive coupling may be accompanied by further evolution that enhances individual barrier effects. Reinforcement, classically viewed as the evolution of prezygotic barriers to gene flow in response to costs of hybridization, is an example of this type of process. However, we argue for an extended view of reinforcement that includes coupling processes involving enhancement of any type of additional barrier effect as a result of an existing barrier. This view of coupling and reinforcement may help to guide development of both theoretical and empirical research on the process of speciation.

show abstract

Transitions between phases of genomic differentiation during stick-insect speciation

Abstract: potentially more complex, as the homogenising effects of gene flow must be countered [1][2][3] . The 49 genic model of speciation proposes that specific genetic regions subject to strong divergent 50

Cited by 168 publications

References 82 publications

Inconsistent reproductive isolation revealed by interactions betweenCatostomusfish species

Inconsistent reproductive isolation revealed by interactions betweenCatostomusfish species

Triplicate parallel life cycle divergence despite gene flow in periodical cicadas

Coupling, Reinforcement, and Speciation

Contact Info

Product

Resources

About