Hybrid speciation driven by multilocus introgression of ecological traits

Nature, Journal Year: 2024, Volume and Issue: 628(8009), P. 811 - 817

Published: April 17, 2024

Abstract Hybridization allows adaptations to be shared among lineages and may trigger the evolution of new species 1,2 . However, convincing examples homoploid hybrid speciation remain rare because it is challenging demonstrate that hybridization was crucial in generating reproductive isolation 3 Here we combine population genomic analysis with quantitative trait locus mapping species-specific traits examine a case Heliconius butterflies. We show elevatus sympatric both parents has persisted as an independently evolving lineage for at least 180,000 years. This despite pervasive ongoing gene flow one parent, pardalinus , which homogenizes 99% their genomes. The remaining 1% introgressed from other melpomene scattered widely across H. genome islands divergence These contain multiple are under disruptive selection, including colour pattern, wing shape, host plant preference, sex pheromones mate choice. Collectively, these place on its own adaptive peak permit coexistence parents. Our results driven by introgression ecological traits, possible multilocus genetic architecture.

Language: Английский

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Selection leads to false inferences of introgression using popular methods

Genetics, Journal Year: 2024, Volume and Issue: 227(4)

Published: May 28, 2024

Detecting introgression between closely related populations or species is a fundamental objective in evolutionary biology. Existing methods for detecting migration and inferring rates from population genetic data often assume neutral model of evolution. Growing evidence the pervasive impact selection on large portions genome across diverse taxa suggests that this assumption unrealistic most empirical systems. Further, ignoring has previously been shown to negatively demographic inferences (e.g. size histories). However, impacts biologically realistic remain poorly explored. Here, we simulate under models background selection, selective sweeps, balancing adaptive introgression. We show sometimes leads false popularly used rely site frequency spectrum. Specifically, some result rejection isolation-only favor isolation-with-migration lead elevated estimates rates. BPP, method analyzes sequence directly, showed positives all conditions at recent divergence times, but also led medium-divergence times. Our results suggest such may be unreliable systems, new are robust need developed.

Language: Английский

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Pervasive mimicry in flight behavior among aposematic butterflies

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(11)

Published: Feb. 26, 2024

Flight was a key innovation in the adaptive radiation of insects. However, it is complex trait influenced by large number interacting biotic and abiotic factors, making difficult to unravel evolutionary drivers. We investigate flight patterns neotropical heliconiine butterflies, well known for mimicry their aposematic wing color patterns. quantify (wing beat frequency angles) 351 individuals representing 29 9 ithomiine species belonging ten pattern groupings. For up angles, we show that group affiliation. Convergence down angles groupings less pronounced, indicating distinct components are under different selection pressures constraints. The characteristics Tiger particularly divergent due convergence with distantly related species. Predator-driven also explained variation among subspecies, this can occur over relatively short timescales. Our results suggest driven signaling rather than shared habitat between comimics. demonstrate behavioral lineages have separated timescales ranging from <0.5 70 My.

Language: Английский

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Documenting homoploid hybrid speciation

Molecular Ecology, Journal Year: 2024, Volume and Issue: unknown

Published: May 23, 2024

Abstract Homoploid hybrid speciation is challenging to document because hybridization can lead outcomes other than speciation. Thus, some authors have argued that establishment of homoploid should include evidence reproductive barriers isolating the neo‐species from its parental species were derived hybridization. While this criterion difficult satisfy, several recent papers successfully employed a common pipeline identify candidate genes underlying such and (in one case) validate their function. We describe pipeline, application plant animal what we learned about as consequence. argue – given ubiquity admixture polygenic basis isolation could be much more protracted suggested by earlier conceptual arguments theoretical studies.

Language: Английский

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Unraveling the Ancient Introgression History of Xanthoceras (Sapindaceae): Insights from Phylogenomic Analysis

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(4), P. 1581 - 1581

Published: Feb. 13, 2025

Ancient introgression is an infrequent evolutionary process often associated with conflicts between nuclear and organellar phylogenies. Determining whether such arise from introgression, incomplete lineage sorting (ILS), or other processes essential to understanding plant diversification. Previous studies have reported phylogenetic discordance in the placement of Xanthoceras, but its causes remain unclear. Here, we analyzed transcriptome data 41 Sapindaceae samples reconstruct phylogenies investigate this discordance. While consistently placed Xanthoceras as sister subfam. Hippocastanoideae, plastid positioned it earliest-diverging within Sapindaceae. Our coalescent simulations suggest that cyto-nuclear unlikely be explained by ILS alone. HyDe PhyloNet analyses provided strong evidence experienced ancient incorporating approximately 16% genetic material ancestral Sapindoideae lineages. Morphological traits further support history, reflecting characteristics both contributing subfamilies. Likely occurring during Paleogene, represents a rare instance cross-subfamily gene flow shaping trajectory major lineage. findings clarify history underscore role driving conflicts, offering example introgression-driven diversification angiosperms.

Language: Английский

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A pattern of hybridisation and population genetic structure of two water frog species (Ranidae, Amphibia) in the southwestern Balkans

Zoologica Scripta, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 20, 2025

Abstract The distribution of the neutral component genetic diversity is interplay historical and ongoing processes resulting in species‐specific structure populations, which can, however, be disrupted by interspecific hybridisation introgression. In this study, we focused on two species water frogs, Pelophylax epeiroticus P. kurtmuelleri , live sympatry southwestern Balkans, to investigate rate population using cytogenetic, mitochondrial (ND2) nuclear DNA (microsatellite) markers. overall was 2.6%, with rates reaching up 10% at specific sites. course gametogenesis occurrence later generations hybrids (beyond F1 generation) indicate a sexual mode hybrid reproduction. bimodal populations rarity suggest substantial reproductive isolation between species; unlikely attributable differences ecological niche occupation. sequence variation ND2 gene revealed divergent lineages clear geographic pattern that corresponds microsatellite contrast, were not as geographically structured showed only weak differentiation both types significantly less variable loci compared which, together high its suggests stronger influence drift. We can hypothesise differential strength drift may lead unequal flow.

Language: Английский

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Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers

PLoS Genetics, Journal Year: 2025, Volume and Issue: 21(3), P. e1011624 - e1011624

Published: March 31, 2025

Hybridization among taxa impacts a variety of evolutionary processes from adaptation to extinction. We seek understand both patterns hybridization across and the ecological forces driving those patterns. To this end, we use whole-genome low-coverage sequencing 458 wild-grown 1565 offspring individuals characterize structure, stability, mating dynamics admixed populations Mimulus guttatus nasutus decade sampling. In three streams, genomes are common M. organellar haplotype is fixed in guttatus, but new events rare. Admixture strongly unidirectional, each stream has unique distribution ancestry proportions. one stream, distinct cohorts spatially structured at ~20-50m resolution stable years. Mating system provides almost complete isolation , partial barrier between cohorts. Isolation due phenology near-complete nasutus. Phenological strong some years cohorts, much weaker other years, providing potential bridge for gene flow. These fluctuations associated with differences water availability supporting role climate mediating strength reproductive isolation. Together, accurately predict assortative which estimate directly using paired maternal genotypes. Climate-driven may promote longer-term stability complex mosaic hybrid ancestry, preventing either or collapse species barriers.

Language: Английский

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Multiple instances of river-lake introgression in the adaptive radiation of sailfin silversides in Wallace’s Dreampond

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2025, Volume and Issue: unknown

Published: April 18, 2025

Abstract While adaptive radiations significantly contribute to the world’s biodiversity, much is unknown about genetic and ecological factors underlying these rapid successions of speciation. It has been suggested that hybridisation can facilitate speciation process by generating diversity on which diversifying selection act. Sailfin silverside fishes (Telmatherinidae) in Malili Lakes system Sulawesi have diversified within last 2 million years. We assembled annotated a chromosome-scale reference genome riverine sailfin Telmatherina bonti generated whole sequences all species Lake Matano, South Sulawesi, Indonesia, one oldest deepest lakes. reconstructed phylogenetic relationships radiation silversides inferred past ongoing introgression patterns. Genome-wide tests confirmed two monophyletic clades, sharpfins roundfins. However, we found mismatches between morphology-based taxonomic assignments genome-wide relationships. signs both old river-dwelling T. lacustrine sharpfin group, as shown elevated D-statistic, f4-ratio f-branch statistic. Levels excess allele sharing three most common declined with increasing distance from river-inlet, indicating at lake-river interface. This combination radiating flock makes Matano particularly valuable study fundamental mechanisms driving under genomic exchange. The phylogenomic framework elaborated this provides foundation for studies processes shaping charismatic radiation.

Language: Английский

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Genetic data suggest gene flow within a narrow hybrid zone between two recently separated species in the genus Parnassius (Lepidoptera: Papilionidae)

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(4), P. e0321742 - e0321742

Published: April 24, 2025

Length polymorphism analysis of six microsatellite loci for 540 Clouded Apollo butterflies from Italy and Switzerland revealed a clear separation between sister species Parnassius mnemosyne P. turatii provided updated limits their respective ranges . Correspondence Structure clustering subset 140 individuals the Eastern Alps determined intermediate genetic makeup three small samples collected in mid Piave valley (northern Italy). The genotypes are not consistent with F1 hybrids, hinting at clinal variation. Our data indicate narrow introgression zone shallow depth 50–100 km what is likely to be only area contact proposed findings incomplete reproductive isolation two species, selection against hybrids or recent establishment secondary contact. latter may result slow recolonization glacial refugia very changes traditional land management practices such as grazing mowing semi-natural grasslands.

Language: Английский

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Standing genetic variation and introgression shape the cryptic radiation of Aquilegia in the mountains of Southwest China

Communications Biology, Journal Year: 2025, Volume and Issue: 8(1)

Published: April 30, 2025

Cryptic diversity in evolutionary radiation offers an excellent system for investigating the intricacies of progress. Understanding evolution cryptic is imperative unraveling hidden complexities biodiversity. However, empirical evidence elucidating mechanisms behind remains limited, particularly plants. Here, we focus on a monophyletic group Aquilegia species mainly distributed mountains Southwest China, one world's biodiversity hotspots. Using whole-genome resequencing 158 individuals from 23 natural populations, identify three to four paraphyletic lineages within each morphological species. Our findings reveal that 39 out 43 detected instances introgression occurred post-lineage formation. Identifying shared genomic regions indicates divergence fixed singletons A. kansuensis and rockii predates lineage formation, supporting scenario where incomplete sorting standing variation contributes parallelism. Furthermore, strong positive correlations among differentiation, divergence, suggest variations non-sister contribute rapid genetic divergence. study illuminates important roles plant radiation, advancing our understanding complex recent events.

Language: Английский

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