Molecular genetic and quantitative trait divergence associated with recent homoploid hybrid speciation: a study of Senecio squalidus (Asteraceae)

Brennan, Adrian C.; Barker, Daniel; Hiscock, Simon J.; Abbott, Richard J.

doi:10.1038/hdy.2011.46

Cited by 45 publications

(43 citation statements)

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“…B 369: 20130346 plants from the hybrid zone from which it was recently derived to determine what changes may have occurred during its origin. Initial comparisons have shown that S. squalidus is clearly distinguished genetically from both parent species and hybrids present on Mount Etna (figure 3a) owing to changes in allele frequencies including loss of some alleles and gain of a few others [73]. It is also different, although less so, in morphology (figure 3b).…”

Section: (B) Hybrid Speciationmentioning

confidence: 99%

Altitudinal gradients, plant hybrid zones and evolutionary novelty

Abbott

Brennan

2014

Phil. Trans. R. Soc. B

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Altitudinal gradients are characterized by steep changes of the physical and biotic environment that present challenges to plant adaptation throughout large parts of the world. Hybrid zones may form where related species inhabit different neighbouring altitudes and can facilitate interspecific gene flow and potentially the breakdown of species barriers. Studies of such hybrid zones can reveal much about the genetic basis of adaptation to environmental differences stemming from changes in altitude and the maintenance of species divergence in the face of gene flow. Furthermore, owing to recombination and transgressive effects, such hybrid zones can be sources of evolutionary novelty. We document plant hybrid zones associated with altitudinal gradients and emphasize similarities and differences in their structure. We then focus on recent studies of a hybrid zone between two Senecio species that occur at high and low altitude on Mount Etna, Sicily, showing how adaptation to local environments and intrinsic selection against hybrids act to maintain it. Finally, we consider the potential of altitudinal hybrid zones for generating evolutionary novelty through adaptive introgression and hybrid speciation. Examples of homoploid hybrid species of Senecio and Pinus that originated from altitudinal hybrid zones are discussed.

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Section: (B) Hybrid Speciationmentioning

confidence: 99%

Altitudinal gradients, plant hybrid zones and evolutionary novelty

Abbott

Brennan

2014

Phil. Trans. R. Soc. B

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“…This question cannot be answered conclusively at this point, and we also ignore here the proportion of hybridization events that have led to speciation (Abbott et al, 2013), but there are hints that HHS is not particularly rare, at least when putative cases of this process are considered with a less stringent view. In addition to the mentioned four paradigmatic cases recognized by Schumer et al (2014), a number of examples of potential homoploid hybrid species have been confirmed: for example, the Oxford ragwort Senecio squalidus (James and Abbott, 2005;Brennan et al, 2012), Iris nelsonii (Arnold, 1993;Taylor et al, 2013), Pinus densata (Wang et al, 2001;Gao et al, 2012), Penstemon clevelandii (Wolfe et al, 1998) and Paeonia anomala (Pan et al, 2007). Significantly, there are many other potential examples of homoploid hybrid species detected in phylogenetic analyses, which have not been thoroughly studied but have been tested against incomplete lineage sorting and have some temporal trajectory and niche differentiation with respect to their progenitors.…”

Section: An Empiricist's Approach To Hhsmentioning

confidence: 99%

Is homoploid hybrid speciation that rare? An empiricist’s view

et al. 2017

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“…Hence, hybridization is increasingly seen as a potential catalyst for adaptive evolutionary change (Kim and Rieseberg, 1999;Barton, 2001;Mallet, 2008;Seehausen, 2012;Abbott et al, 2013). Hybridization may enhance both genetic and phenotypic variation (Brennan et al, 2012) and alter the evolvability of certain characters via changes in genetic and phenotypic covariances (Grant and Grant, 1994), especially when decreased linkage equilibrium between loci affecting different traits lead to a release in genetic constraints (Seehausen, 2012). Under certain circumstances, recombination and selection may ultimately lead to the formation of new species without a change in chromosome numbers, known as homoploid hybrid speciation (Mallet, 2007).…”

Section: Introductionmentioning

confidence: 99%

Local adaptation within a hybrid species

Eroukhmanoff

Bailey

et al. 2013

Heredity

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Ecological divergence among populations may be strongly influenced by their genetic background. For instance, genetic admixture through introgressive hybridization or hybrid speciation is likely to affect the genetic variation and evolvability of phenotypic traits. We studied geographic variation in two beak dimensions and three other phenotypic traits of the Italian sparrow (Passer italiae), a young hybrid species formed through interbreeding between house sparrows (P. domesticus) and Spanish sparrows (P. hispaniolensis). We found that beak morphology was strongly influenced by precipitation regimes and that it appeared to be the target of divergent selection within Italian sparrows. Interestingly, however, the degree of parental genetic contribution in the hybrid species had no effect on phenotypic beak variation. Moreover, beak height divergence may mediate genetic differentiation between populations, consistent with isolation-by-adaptation within this hybrid species. The study illustrates how hybrid species may be relatively unconstrained by their admixed genetic background, allowing them to adapt rapidly to environmental variation.

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Molecular genetic and quantitative trait divergence associated with recent homoploid hybrid speciation: a study of Senecio squalidus (Asteraceae)

Cited by 45 publications

References 50 publications

Altitudinal gradients, plant hybrid zones and evolutionary novelty

Altitudinal gradients, plant hybrid zones and evolutionary novelty

Is homoploid hybrid speciation that rare? An empiricist’s view

Local adaptation within a hybrid species

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