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11 results for “Homoploid hybrid speciation”
Data from: Homoploid hybrid speciation in a marine pelagic fish
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Data from: Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum
Well-characterised 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 SSRs and SNP data indicate that the homoploid hybrid species are distinct from the parental taxa, whilst 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 are likely to have played a more important role in oceanic island radiations than we currently think.
Data from: Demography and speciation history of the homoploid hybrid pine Pinus densata on the Tibetan Plateau
Pinus densata is an ecologically successful homoploid hybrid that inhabits vast areas of heterogeneous terrain on the southeastern Tibetan Plateau as a result of multiple waves of colonization. Its region of origin, route of colonization onto the plateau and the directions of introgression with its parental species have previously been defined, but little is known about the isolation and divergence history of its populations. In this study, we surveyed nucleotide polymorphism over eight nuclear loci in 19 representative populations of P. densata and its parental species. Using this information and coalescence simulations, we assessed the historical changes in its population size, gene flow, and divergence in time and space. The results indicate a late Miocene origin for P. densata associated with the recent uplift of southeastern Tibet. The subsequent differentiation between geographical regions of this species began in the late Pliocene and was induced by regional topographic changes and Pleistocene glaciations. The ancestral P. densata population had a large effective population size but the central and western populations were established by limited founders, suggesting that there were severe bottlenecks during the westward migration out of the ancestral hybrid zone. After separating from their ancestral populations, population expansion occurred in all geographic regions especially in the western range. Gene flow in P. densata was restricted to geographically neighboring populations, resulting in significant differentiation between regional groups. The new information on the divergence and demographic history of P. densata reported herein enhances our understanding of its speciation process on the Tibetan Plateau.
Data from: Demography and speciation history of the homoploid hybrid pine Pinus densata on the Tibetan Plateau
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Data from: Distinct niche divergence characterizes the homoploid hybrid speciation of Pinus densata on the Tibetan Plateau
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Data from: Completing the hybridization triangle: the inheritance of genetic incompatibilities during homoploid hybrid speciation in ragworts (Senecio).
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Data from: Independent homoploid hybrid speciation events in the Macaronesian endemic genus Argyranthemum
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Data from: Genetic divergence and the number of hybridizing species affect the path to homoploid hybrid speciation
Hybridization is often maladaptive, and in some instances has led to the loss of biodiversity. However, hybridization can also promote speciation, such as during homoploid hybrid speciation, thereby generating biodiversity. Despite examples of homoploid hybrid species, the importance of hybridization as a speciation mechanism is still widely debated, and we lack a general understanding of the conditions most likely to generate homoploid hybrid species. Here we show that the level of genetic divergence between hybridizing species has a large effect on the probability that their hybrids evolve reproductive isolation. We find that populations of hybrids formed by parental species with intermediate levels of divergence were more likely to mate assortatively, and discriminate against their parental species, than those generated from weakly or strongly diverged parental species. Reproductive isolation was also found between hybrid populations, suggesting differential sorting of parental traits across populations. Finally, hybrid populations derived from three species were more likely to evolve reproductive isolation than those derived from two, supporting arguments that hybridization-supplied genetic diversity can lead to the evolution of novel "adaptive systems" and promote speciation. Our results illustrate when we expect hybridization and admixture to promote hybrid speciation. Whether homoploid hybrid speciation is a common speciation mechanism in general, remains an outstanding empirical question.
Data from: Genetic divergence, range expansion and possible homoploid hybrid speciation among pine species in northeast China
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Data from: Genetic divergence and the number of hybridizing species affect the path to homoploid hybrid speciation
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Data from: Behavioural isolation may facilitate homoploid hybrid speciation in cichlid fish
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.