ArticleEvolution; international journal of organic evolution2021
Two new hybrid populations expand the swordtail hybridization model system.
Article in Evolution; international journal of organic evolution, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed, 20 citations in OpenAlex.
- Sensitivity of genome-wide tests for mitonuclear genetic incompatibilities.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2026Article
- Insertion of an invading retrovirus regulates a novel color trait in swordtail fish.bioRxiv : the preprint server for biology · 2025Article
- Pervasive gene flow despite strong and varied reproductive barriers in swordtails.Nature ecology & evolution · 2025Article
- Differentiating mechanism from outcome for ancestry-assortative mating in admixed human populations.Genetics · 2025Article
- Differentiating mechanism from outcome for ancestry-assortative mating in admixed human populations.bioRxiv : the preprint server for biology · 2024Article
- Recent secondary contact, genome-wide admixture, and asymmetric introgression of neo-sex chromosomes between two Pacific island bird species.PLoS genetics · 2024Article
- Swordtail fish hybrids reveal that genome evolution is surprisingly predictable after initial hybridization.PLoS biology · 2024Article
- Pervasive gene flow despite strong and varied reproductive barriers in swordtails.bioRxiv : the preprint server for biology · 2024Article
- Article
- Genome evolution is surprisingly predictable after initial hybridization.bioRxiv : the preprint server for biology · 2023Article
- Assortative mating enhances postzygotic barriers to gene flow via ancestry bundling.Proceedings of the National Academy of Sciences of the United States of America · 2022Article
- Estimating the time since admixture from phased and unphased molecular data.Molecular ecology resources · 2022Article
- Predictability and parallelism in the contemporary evolution of hybrid genomes.PLoS genetics · 2022Article
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Authors and funding
8 authors at 4 institutions in 2 countries.
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Abstract
Natural hybridization events provide unique windows into the barriers that keep species apart as well as the consequences of their breakdown. Here, we characterize hybrid populations formed between the northern swordtail fish Xiphophorus cortezi and Xiphophorus birchmanni from collection sites on two rivers. We use simulations and new genetic reference panels to develop sensitive and accurate local ancestry calling in this novel system. Strikingly, we find that hybrid populations on both rivers consist of two genetically distinct subpopulations: a cluster of pure X. birchmanni individuals and one of phenotypically intermediate hybrids that derive ∼85-90% of their genome from X. cortezi. Simulations suggest that initial hybridization occurred ∼150 generations ago at both sites, with little evidence for contemporary gene flow between subpopulations. This population structure is consistent with strong assortative mating between individuals of similar ancestry. The patterns of population structure uncovered here mirror those seen in hybridization between X. birchmanni and its sister species, Xiphophorus malinche, indicating an important role for assortative mating in the evolution of hybrid populations. Future comparisons will provide a window into the shared mechanisms driving the outcomes of hybridization not only among independent hybridization events between the same species but also across distinct species pairs.
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