Complex patterns of differentiation and gene flow underly the divergence of aposematic phenotypes in <i>Oophaga</i> poison frogs

Ebersbach, Jana; Posso-Terranova, Andrés; Bogdanowicz, Steven M.; Gómez-Díaz, Mónica; García-González, Ma Ximena; Bolívar-García, Wilmar; Andrés, José Á.

doi:10.1111/mec.15360

Cited by 19 publications

(16 citation statements)

References 78 publications

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“…For decades, studies on hybrid zones have provided insights into the basis and process of speciation (Barton & Hewitt, 1985; Harrison & Larson, 2016; Hewitt, 2001). Hybrid zones are also relevant for understanding adaptation because gene flow between divergent lineages can facilitate sharing of adaptive alleles (Arnold, 2006; Fitzpatrick et al., 2009) or provide novel gene combinations that promote adaptation by generating new phenotypes for selection to act upon (Ebersbach et al., 2020; Mallet, 2007; Mavárez & Linares, 2008; Seehausen & Schluter, 2004). Increasing accessibility of population genomic data provides an exciting opportunity to examine the genomic patterns underlying hybridization and its role in these fundamental evolutionary processes (Gompert et al., 2017).…”

Section: Introductionmentioning

confidence: 99%

Genetic and phenotypic evidence of a contact zone between divergent colour morphs of the iconic red‐eyed treefrog

et al. 2020

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Hybrid zones act as natural laboratories where divergent genomes interact, providing powerful systems for examining the evolutionary processes underlying biological diversity. In this study, we characterized patterns of genomic and phenotypic variation resulting from hybridization between divergent intraspecific lineages of the Neotropical red‐eyed treefrog (Agalychnis callidryas). We found genetic evidence of a newly discovered contact zone and phenotypic novelty in leg colour—a trait suspected to play a role in mediating assortative mating in this species. Analysis of hybrid ancestry revealed an abundance of later‐generation Fn individuals, suggesting persistence of hybrids in the contact zone. Hybrids are predominantly of southern ancestry but are phenotypically more similar to northern populations. Genome‐wide association mapping revealed QTL with measurable effects on leg‐colour variation, but further work is required to dissect the architecture of this trait and establish causal links. Further, genomic cline analyses indicated substantial variation in patterns of introgression across the genome. Directional introgression of loci associated with different aspects of leg colour are inherited from each parental lineage, creating a distinct hybrid colour pattern. We show that hybridization can generate new phenotypes, revealing the evolutionary processes that potentially underlie patterns of phenotypic diversity in this iconic polytypic frog. Our study is consistent with a role of hybridization and sexual selection in lineage diversification, evolutionary processes that have been implicated in accelerating divergence in the most phenotypically diverse species.

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Section: Introductionmentioning

confidence: 99%

Genetic and phenotypic evidence of a contact zone between divergent colour morphs of the iconic red‐eyed treefrog

et al. 2020

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“…Homoploid hybrid speciation is thought to be rare in vertebrates, but recent studies have highlighted an increasing number of examples ( 46 , 50 ). Lineage fusions, wherein diverging lineages—or portions of those lineages—merge to become geographically isolated but admixed evolutionary entities, seem to be more common than previously realized ( 51 , 52 ).…”

Section: Discussionmentioning

confidence: 99%

River network rearrangements promote speciation in lowland Amazonian birds

et al. 2022

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Large Amazonian rivers impede dispersal for many species, but lowland river networks frequently rearrange, thereby altering the location and effectiveness of river barriers through time. These rearrangements may promote biotic diversification by facilitating episodic allopatry and secondary contact among populations. We sequenced genome-wide markers to evaluate the histories of divergence and introgression in six Amazonian avian species complexes. We first tested the assumption that rivers are barriers for these taxa and found that even relatively small rivers facilitate divergence. We then tested whether species diverged with gene flow and recovered reticulate histories for all species, including one potential case of hybrid speciation. Our results support the hypothesis that river rearrangements promote speciation and reveal that many rainforest taxa are micro-endemic, unrecognized, and thus threatened with imminent extinction. We propose that Amazonian hyper-diversity originates partly from fine-scale barrier displacement processes—including river dynamics—which allow small populations to differentiate and disperse into secondary contact.

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“…Homoploid hybrid speciation is thought to be rare in vertebrates, but recent studies have highlighted an increasing number of examples (46,50). Indeed, lineage fusions, wherein diverging lineages -or portions of those lineages-merge to become geographically isolated but admixed evolutionary entities, seem to be more common than previously realized (51,52).…”

Section: Discussionmentioning

confidence: 99%

River network rearrangements promote speciation in lowland Amazonian birds

Musher

Giakoumis

Albert

et al. 2021

Preprint

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Large Amazonian rivers impede dispersal for many species, but lowland river networks frequently rearrange, thereby altering the location and effectiveness of river-barriers through time. These rearrangements may promote biotic diversification by facilitating episodic allopatry and secondary contact among populations. We sequenced genome-wide markers to evaluate histories of divergence and introgression in six Amazonian avian species-complexes. We first tested the assumption that rivers are barriers for these taxa and found that even relatively small rivers facilitate divergence. We then tested whether species diverged with gene flow and recovered reticulate histories for all species, including one potential case of hybrid speciation. Our results support the hypothesis that river dynamics promote speciation and reveal that many rainforest taxa are micro-endemic, unrecognized and thus threatened with imminent extinction. We propose that Amazonian hyper-diversity originates in part from fine-scale barrier displacement processes –including river dynamics– which allow small populations to differentiate and disperse into secondary contact.

show abstract

Complex patterns of differentiation and gene flow underly the divergence of aposematic phenotypes in Oophaga poison frogs

Cited by 19 publications

References 78 publications

Genetic and phenotypic evidence of a contact zone between divergent colour morphs of the iconic red‐eyed treefrog

Genetic and phenotypic evidence of a contact zone between divergent colour morphs of the iconic red‐eyed treefrog

River network rearrangements promote speciation in lowland Amazonian birds

River network rearrangements promote speciation in lowland Amazonian birds

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