In situ diversification and adaptive introgression in Taiwanese Scutellaria

Plant Biology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract Island habitats provide unique opportunities to study speciation. Recent work indicates that both ex situ origination and in speciation contribute island species diversity. However, clear evidence of local adaptation endemic plant on islands requires in‐depth studies, which are scarce. This underscores the importance maintaining boundaries by examining how adaptive introgression, hybridization, genetic variation species. Multilocus genome scanning 51 nuclear genes was used investigate evolutionary relationships Scutellaria complex Taiwan assess role diversification generating high endemism Interspecies introgressions were detected phylogenetic networks ABBA‐BABA‐based analysis, suggesting ongoing or recent processes. Coalescent‐based simulation identified hybrid taiwanensis hsiehii , with hybridization between more than two parental Genotype‐environment association studies revealed influence climate, particularly precipitation‐ temperature‐related factors, contributed divergence Additionally, introgression related environmental pressures may have facilitated colonization new identified. research illustrates shaped histories this island‐endemic sheds light multifaceted mechanisms semi‐isolated islands.

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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Rapid establishment of species barriers in plants compared to animals

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: Oct. 20, 2023

Speciation, the process by which new reproductively isolated species arise from ancestral populations, occurs because of genetic changes that accumulate over time. To date, notion interspecific exchange more frequently between plant than animals has gained a strong footing in scientific discourse, albeit primarily relying on verbal arguments centered mating behavior. By examining dynamics gene flow across continuum divergence both kingdoms, we observe opposite relationship: plants experience less introgression at same level divergence, suggesting barriers are established rapidly plants. This pattern questions differences microevolutionary processes and impact macroevolutionary scale. One Sentence Summary Genetic is frequent animal plants, challenging historical views.

Language: Английский

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Symbiotic status does not preclude hybridisation in Mediterranean octocorals

Published: May 5, 2024

Understanding how species can form and remain isolated in the marine environment is still an active research area. Correctly delimiting if also of interest for biodiversity conservation a wide range biological studies. Here we study differentiation possibility hybridization among three temperate octocorals : Eunicella cavolini, E. singularis verrucosa. These occur sympatry morphologically intermediate individuals have been observed. Among these species, only one known to show mutualistic symbiosis with photosynthetic Symbiodiniaceae. As symbiotic relationships be involved barriers, tested here between non-symbiotic species. Through multivariate analyses hybrid detection, prove existence current gene flow observation F1 F2 hybrids backcrosses. Demographic inferences indicate scenario secondary contact two Our data suggest abundance Symbiodiniaceae We discuss evolution / cnidarian light our results.

Language: Английский

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Diverging Arabidopsis populations quickly accumulate pollen-acting genetic incompatibilities

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: May 17, 2024

Abstract The process by which species diverge from one another, gradually accumulate genetic incompatibilities and eventually reach full-fledged reproductive isolation is a key question in evolutionary biology. However, the nature of barriers, pace at they their genomic distribution remain poorly documented. disruption co-adapted epistatic interactions hybrids accumulation selfish elements are proposed contributors to this process, can lead distortion mendelian segregation affected loci across genome. In study we detect quantify genomes crosses produced diverse sampling Arabidopsis lyrata A. halleri populations, two early stages speciation that still interbreed. We show both frequency occurrence magnitude increase as parents’ distance another increases. also observe distorter evolve rapidly, occur not only within interspecific hybrids, but intraspecific isolated population crosses. Finally, identify genome-wide non-independence specific regions on different chromosomes where opposite effects repeatedly observed multiple F1 individuals, suggesting negative epistasis major contributor evolution hybrid distortion. Our demonstrates pollen-acting ubiquitous, contributes ongoing between , very recently diverged populations same species.

Language: Английский

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L’espèce incertaine et les taxons flous

Published: June 20, 2024

La question de la « bonne » définition l’espèce, qui unit les biologistes, naturalistes et personnes impliquées dans l’usage ou conservation biodiversité, est constamment réactualisée par progrès des connaissances sur l’évolution spéciation. Cette loin d’être résolue parce que spéciation à l’œuvre biodiversité actuelle taxons rang spécifique ne sont donc pas espèces certaines mais plutôt hypothèses d’espèces restent souvent tester. Darwin soulignait l’importance douteuses pour son argumentation variation. Nous illustrons cette propriété du vivant résister classification l’exemple flous peuvent être résumés en deux grands types, le syngaméon naissantes. variété cas d’études rapportant flux gènes entre espèces, parfois genres, rôle écologique ceux-ci, souligne l’espèce incertaine constitue un aspect majeur problématiques biodiversité.

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Rapid Genetic Isolation Among Four Lineages Of Silene nutans

Plant and Cell Physiology, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 25, 2024

Speciation is the process leading to emergence of new species. While being usually progressive, it can sometimes be fast with rapid reproductive barriers high level isolation. Some might leave signatures in genome, through elevated genetic differentiation at specific loci. Similar also results linked selection acting low recombination regions. Nottingham catchfly (Silene nutans) a Caryophyllaceae species composed four genetically differentiated lineages for which strong and asymmetric levels isolation have been identified. Using population transcriptomic data from several individuals lineages, we inferred best evo-demographic scenario current these lineages. We tested whether loci exhibiting represented barrier or were located regions, evolving under influence selection. Overall, S. nutans diverged strict isolation, likely during different glacial period, migration distinct refugia. between appeared particularly fast, due plastid genome accelerating plastid-nuclear co-evolution probability incompatibilities inter-lineage hybrids.

Language: Английский

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