The Role of Hybridization in Species Formation and Persistence

Peñalba, Joshua V.; Runemark, Anna; Meier, Joana I.; Singh, Pooja; Wogan, Guinevere O.U.; Sánchez-Guillén, Rosa; Mallet, James; Rometsch, Sina J.; Menon, Mitra; Seehausen, Ole; Kulmuni, Jonna; Pereira, Ricardo J.

doi:10.1101/cshperspect.a041445

Cited by 10 publications

(3 citation statements)

References 243 publications

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“…But hybrids sometimes display a fitness advantage, and another set of questions involve hybrid speciation, or the role of introgression in hindering or driving divergence—especially during adaptive radiations ( Anderson 1949 ; Seehausen 2004 ; Abbott et al 2013 ; Marques et al. 2019 ; Peñalba et al 2023 ).…”

Section: What Are Fitness Landscapes and How Are They Useful For Stud...mentioning

confidence: 99%

Fisher's Geometric Model as a Tool to Study Speciation

Schneemann,

De Sanctis,

Welch

2024

Cold Spring Harb Perspect Biol

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Interactions between alleles and across environments play an important role in the fitness of hybrids, and are at the heart of the speciation process. Fitness landscapes capture these interactions and can be used to model hybrid fitness, helping us to interpret empirical observations and clarify verbal models. Here, we review recent progress in understanding hybridization outcomes through Fisher's geometric model, an intuitive and analytically tractable fitness landscape that captures many fitness patterns observed across taxa. We use case studies to illustrate how the model parameters can be estimated from different types of data, and discuss how these estimates can be used to make inferences about the divergence history and genetic architecture. We also highlight some areas where the model's predictions differ from alternative incompatibility-based models, such as the snowball effect and outlier patterns in genome scans.Given eqs. 1 and 2, and the complete set of the a ij and d ij , we can assign a fitness value to all possible genotypes. Moreover, from knowledge of the distributions of the a ij and d ij , we can make predictions about the typical fitnesses of different classes of genotype (see §2.2 below). Note also that the description above encompasses important models of speciation, such as that of Mani and Clarke (1990), even though those authors did not use the term "Fisher's geometric model".A phenotypic model or a fitness landscape?The model described above is often treated primarily as a phenotypic model, and used to study the evolution of quantitative traits -i.e. the evolution of the z i (e.g.

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Section: What Are Fitness Landscapes and How Are They Useful For Stud...mentioning

confidence: 99%

Fisher's Geometric Model as a Tool to Study Speciation

Schneemann,

De Sanctis,

Welch

2024

Cold Spring Harb Perspect Biol

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“… 2 Interspecific hybridization among species can occasionally reassemble existing genetic variation and lead to adaptive change, 3 but comparative studies across various hybridizing taxa indicate that there is predominantly a negative correlation between the probability of hybridization and the genetic divergence between lineages. 4 During the initial stages of divergence, the probability of hybridization between sympatric lineages is often high and many incipient species are, as a consequence, likely ephemeral in nature. 5 Lineages that do persist gradually accumulate traits and loci that reduce gene flow over time, and this process can eventually result in complete reproductive isolation.…”

Section: Introductionmentioning

confidence: 99%

“…However, across hybridizing species pairs, the slope of this trajectory can vary and there are several factors that determine the correlation strength between genetic divergence and reproductive isolation. 4 Sexual selection, for example, can expedite the build-up of reproductive isolation if sexual traits differentiate rapidly during the early stages of species formation. 6 Similarly, during the latter stages, reinforcement following secondary contact can accelerate reproductive isolation between divergent lineages.…”

Section: Introductionmentioning

confidence: 99%

Hybridization in birds-of-paradise: Widespread ancestral gene flow despite strong sexual selection in a lek-mating system

Blom,

Peona,

Prost

et al. 2024

iScience

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Symbiosis, hybridization, and speciation in Mediterranean octocorals (Octocorallia, Eunicellidae)

Aurelle,

Haguenauer,

Bally

et al. 2024

Biological Journal of the Linnean Society

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Understanding how species can form and remain isolated in the marine environment still stimulates active research. Here we study the differentiation and the possibility of hybridization among three temperate octocorals: Eunicella cavolini, Eunicella singularis, and Eunicella verrucosa. Morphologically intermediate individuals have been observed between them. Among these three species, E. singularis is the only one described in mutualistic symbiosis with photosynthetic Symbiodiniaceae. The symbiosis between Symbiodiniaceae and scleractinian corals is well studied, especially in the context of the response to anthropogenic climate change. Nevertheless, the potential role of symbiotic interactions in speciation processes remains unknown in cnidaria. We tested here the possibility of hybridization between symbiotic and non-symbiotic Eunicella species. Through multivariate analyses and hybrid detection, we prove the existence of on-going gene flow between E. singularis and E. cavolini, with the observation of F1 and F2 hybrids, and backcrosses. Demographic inferences indicate a scenario of secondary contact between these two species. Despite current gene flow, these two species appear genetically well differentiated. Our data also suggest an intermediate abundance of Symbiodiniaceae in the hybrids of the two parental populations. We discuss the evolution of the Symbiodiniaceae/cnidarian symbiosis in the light of our results.

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The Role of Hybridization in Species Formation and Persistence

Cited by 10 publications

References 243 publications

Fisher's Geometric Model as a Tool to Study Speciation

Fisher's Geometric Model as a Tool to Study Speciation

Hybridization in birds-of-paradise: Widespread ancestral gene flow despite strong sexual selection in a lek-mating system

Symbiosis, hybridization, and speciation in Mediterranean octocorals (Octocorallia, Eunicellidae)

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