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

Feliner, Gonzalo Nieto; Álvarez, Inés; Aguilar, Javier Fuertes; Heuertz, Myriam; Marques, Isabel; Moharrek, Farideh; Piñeiro, Rosalía; Riina, Ricarda; Rosselló, Josep A.; Soltis, Pamela S.; Villa-Machío, Irene

doi:10.1038/hdy.2017.7

Cited by 136 publications

(112 citation statements)

References 72 publications

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“…The accurate identification of a homoploid hybrid species is experimentally challenging, often requiring a combination of morphological and molecular analyses (Mallet, ). In addition, there is a lack of agreement on the defining criteria of a homoploid hybrid species (Nieto Feliner et al., ; Schumer, Rosenthal, & Andolfatto, ; Schumer et al., ). Nevertheless, given that occasional hybridization between closely related species is frequent in plants (Mallet, ) and that homoploid hybrids are difficult to identify, opinion has recently shifted to speculate that HHS might play a more prominent role in plant evolution than previously thought (Mallet, ; Mavárez & Linares, ; Nolte & Tautz, ).…”

Section: Introductionmentioning

confidence: 99%

Independent homoploid hybrid speciation events in the Macaronesian endemic genusArgyranthemum

et al. 2018

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Well‐characterized examples of homoploid hybrid speciation (HHS) are rare in nature, yet they offer the potential to study a number of evolutionary processes. In this study, we investigate putative homoploid hybrid species in the genus Argyranthemum (Asteraceae), a group of plants endemic to the Macaronesian archipelagos of the North Atlantic Ocean. We specifically address a number of knowledge gaps surrounding the origin(s) of A. sundingii and A. lemsii, which are thought to be derived from the same parental cross. Comparisons of leaf morphology suggest that A. sundingii and A. lemsii are distinct from their parental progenitors and distinguishable from each other based on leaf area. Ecological niche modelling (ENM) demonstrated that the homoploid hybrid species occupy novel habitats that are intermediate relative to the parental species. Nuclear simple sequence repeat markers (SSRs) and single nucleotide polymorphism (SNP) data indicate that the homoploid hybrid species are distinct from the parental taxa, while population‐level sampling of chloroplast SSRs and approximate Bayesian computation show that A. sundingii and A. lemsii are independently derived from the same parental cross. As such, Argyranthemum represents an example of independent homoploid hybrid speciation events with evidence of divergence in leaf morphology and adaptation to novel intermediate habitats. On oceanic islands, which are often typified by steep ecological gradients and inhabited by recently derived species with weak reproductive barriers, multiple HHS events from the same parental cross are not only possible but also likely to have played a more important role in oceanic island radiations than we currently think.

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Section: Introductionmentioning

confidence: 99%

Independent homoploid hybrid speciation events in the Macaronesian endemic genusArgyranthemum

et al. 2018

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“…Genome-wide sequence data have led to an increased appreciation of the prevalence of admixture and introgression between species (Payseur & Rieseberg, 2016;Pease et al, 2016;Wallbank et al, 2016). While the consequences of hybridization have historically been viewed as maladaptive (Fisher, 1930), others have proposed that hybridization can be a generative force that facilitates adaptive evolution and speciation (Hedrick, 2013;Mallet, 2007;Nieto Feliner et al, 2017;Seehausen, 2004). If this is the case, hybridization may play a significant role in the production of biodiversity (Mallet, 2007), and a few empirical examples have even linked the evolution of RI, without a change in ploidy, to hybridization and admixture occurring between different species (Jiggins et al, 2008;Lamichhaney et al, 2017;Melo et al, 2009;Rieseberg et al, 1995;Ungerer et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

The genomic and ecological context of hybridization affects the probability that symmetrical incompatibilities drive hybrid speciation

Comeault

2018

Ecology and Evolution

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Despite examples of homoploid hybrid species, theoretical work describing when, where, and how we expect homoploid hybrid speciation to occur remains relatively rare. Here, I explore the probability of homoploid hybrid speciation due to “symmetrical incompatibilities” under different selective and genetic scenarios. Through simulation, I test how genetic architecture and selection acting on traits that do not themselves generate incompatibilities interact to affect the probability that hybrids evolve symmetrical incompatibilities with their parent species. Unsurprisingly, selection against admixture at “adaptive” loci that are linked to loci that generate incompatibilities tends to reduce the probability of evolving symmetrical incompatibilities. By contrast, selection that favors admixed genotypes at adaptive loci can promote the evolution of symmetrical incompatibilities. The magnitude of these outcomes is affected by the strength of selection, aspects of genetic architecture such as linkage relationships and the linear arrangement of loci along a chromosome, and the amount of hybridization following the formation of a hybrid zone. These results highlight how understanding the nature of selection, aspects of the genetics of traits affecting fitness, and the strength of reproductive isolation between hybridizing taxa can all be used to inform when we expect to observe homoploid hybrid speciation due to symmetrical incompatibilities.

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“…This hypothesis would be reinforced if the putative descendants (MO6146 and MO6147) had a level of 2 n = 8 x = 64. On the other hand, if the ploidy level of these populations corresponded to 2 n = 4 x = 32, a homoploid hybridization process could not be ruled out (Mameli et al, ; Marques et al, ; Nieto‐Feliner et al, ). However, another types of data are necessary (i.e., karyological, cross‐over studies) to understand the biology of these intermediate forms and to interpret them correctly.…”

Section: Discussionmentioning

confidence: 99%

Advances in the systematics and evolution of western Mediterranean representative species of the Pentanema conyzae clade through genetic fingerprinting

Gutiérrez-Larruscain

Andrés‐Sánchez

Rico

et al. 2018

J of Sytematics Evolution

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Forty‐five populations of Pentanema corresponding to seven species included in the Pentanema conyzae clade have been studied using AFLP fingerprinting. The results show that allopolyploidization could have been involved in the diversification of this group, specifically in species P. langeanum and P. maletii. Molecular data confirm the presence of P. britannicum in the Iberian Peninsula and key steps are provided to identify the species that are morphologically the most challenging.

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

Cited by 136 publications

References 72 publications

Independent homoploid hybrid speciation events in the Macaronesian endemic genusArgyranthemum

Independent homoploid hybrid speciation events in the Macaronesian endemic genusArgyranthemum

The genomic and ecological context of hybridization affects the probability that symmetrical incompatibilities drive hybrid speciation

Advances in the systematics and evolution of western Mediterranean representative species of the Pentanema conyzae clade through genetic fingerprinting

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