Academic Journal
Introgression and Divergence in a Young Species Group.
| Τίτλος: | Introgression and Divergence in a Young Species Group. |
|---|---|
| Συγγραφείς: | Satokangas I; Organismal & Evolutionary Biology Research Programme, University of Helsinki, Helsinki, Finland.; Institute of Ecology and Evolution, Ashworth Laboratories, University of Edinburgh, Edinburgh, UK., Martin SH; Institute of Ecology and Evolution, Ashworth Laboratories, University of Edinburgh, Edinburgh, UK., Seifert B; Department of Entomology, Senckenberg Museum für Naturkunde, Görlitz, Germany., Puukko T; Organismal & Evolutionary Biology Research Programme, University of Helsinki, Helsinki, Finland., Schultz R; Department of Entomology, Senckenberg Museum für Naturkunde, Görlitz, Germany., Helanterä H; Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland., Kulmuni J; Organismal & Evolutionary Biology Research Programme, University of Helsinki, Helsinki, Finland.; Tvärminne Zoological Station, University of Helsinki, Hanko, Finland.; Institute for Biodiversity and Ecosystem Dynamics, Department of Evolutionary and Population Biology, University of Amsterdam, Amsterdam, the Netherlands. |
| Πηγή: | Molecular ecology [Mol Ecol] 2026 Jun; Vol. 35 (12), pp. e70448. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Blackwell Scientific Publications Country of Publication: England NLM ID: 9214478 Publication Model: Print Cited Medium: Internet ISSN: 1365-294X (Electronic) Linking ISSN: 09621083 NLM ISO Abbreviation: Mol Ecol Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Oxford, UK : Blackwell Scientific Publications, c1992- |
| Ιατρικοί όροι (MeSH): | Ants*/genetics , Ants*/classification , Genetic Speciation* , Genetic Introgression*, DNA, Mitochondrial/genetics ; Animals ; Gene Flow ; Phylogeny ; Models, Genetic ; Sequence Analysis, DNA ; Hybridization, Genetic ; Genetic Variation ; Reproductive Isolation ; Genetics, Population |
| Περίληψη: | The process of speciation concerns often multiple diverging and interacting taxa, not only taxon pairs. Understanding the evolution of species' diversity and their persistence therefore requires insight into how gene flow and evolution of reproductive isolation shape groups of closely related species. Using resequencing data, we disentangle genomic patterns of divergence and introgression in five Formica rufa group wood ant species at an early stage of speciation. We revise earlier mitochondrial phylogenies using a nuclear genomic tree and demonstrate that introgression has occurred in line with observations of current day natural hybridisation. Genome-wide correlations between divergence, differentiation, and diversity are in line with theoretical expectations for young species. However, despite previous evidence for polygenic species barriers, our data lack the genome-wide correlation between differentiation and divergence expected under a polygenic barriers model. This is likely explained by the dominating effect of ancestral diversity at these early stages of speciation. Interestingly, we find no strong positive genome-wide correlation between introgression and recombination, suggesting introgression is not predominantly deleterious. This contrasts with many previous empirical studies but aligns with new theoretical work on the interplay of divergence and introgression. Moreover, we observe low diversity in genomic regions with high introgression. This may signal that selection has favoured introgression in specific genomic regions. Such selection would be consistent with previous reports on wood ant hybrids, in which parental species ancestry is sorted likely due to positive selection, or because it allows reduction of genetic load. Benefiting from our focus on the whole F. rufa group and its introgression patterns, we show that interestingly, gene flow could cross multiple species boundaries even without direct interbreeding between each of the species. We discuss the long-term benefits and costs of introgression in young species, including the effect of environmental fluctuations and multi-species introgression. (© 2026 The Author(s). Molecular Ecology published by John Wiley & Sons Ltd.) |
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| Grant Information: | 328961 Academy of Finland; 346805 Academy of Finland; Alfred Kordelinin Säätiö |
| Contributed Indexing: | Keywords: Formica wood ants; divergence; hybridization; introgression; speciation |
| Substance Nomenclature: | 0 (DNA, Mitochondrial) |
| Entry Date(s): | Date Created: 20260626 Date Completed: 20260626 Latest Revision: 20260726 |
| Update Code: | 20260726 |
| PubMed Central ID: | PMC13308388 |
| DOI: | 10.1111/mec.70448 |
| PMID: | 42360183 |
| Βάση Δεδομένων: | MEDLINE |
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