From Pleistocene Corridors to Isolated Peaks and Back: Biogeography of Afrocarduus (Compositae) in the Afromontane Archipelago
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Le résumé fourni par la source
ABSTRACT Aim We investigated the biogeographic history and diversification dynamics of Afrocarduus , an Afromontane–Afroalpine genus endemic to eastern Africa. We aimed to assess the roles of geographic isolation, habitat transitions, and ecological speciation in shaping current diversity. Location The Afromontane and Afroalpine regions of East Africa and Ethiopia are situated along the Great Rift Valley system. Taxon Afrocarduus (Compositae: Carduinae), a genus comprising 18 endemic species. Methods We conducted a comprehensive taxonomic and geographic sampling of Afrocarduus , generating data from 489 nuclear loci. Phylogenomic and biogeographic ancestral estimation analyses were performed to infer the evolutionary history and historical biogeography of the genus. Results Afrocarduus originated in the Afromontane zone of eastern Africa during the Late Miocene (~10.7 Ma), with major diversification events occurring in the Early Pleistocene (~2.3 Ma). Most dispersal events occurred between neighbouring massifs, though occasional long‐distance dispersal between disjunct mountain systems was detected. The Turkana Depression and the Great Rift Valley have acted as major biogeographic barriers. Phylogenetic structure shows distinct clades occupying different regions. Ecological divergence between Afromontane and Afroalpine environments contributed to speciation, with at least six independent adaptations to Afroalpine conditions and multiple cases of ecological reversal. Stem loss, a trait associated with alpine habitats, evolved convergently in two clades. Closely related species often segregate by elevation or microhabitat within the same massif. Main Conclusions The diversification of Afrocarduus has been shaped by a combination of historical climate change, geographic isolation, and ecological adaptation. Our results emphasise the importance of ecological speciation and habitat transitions in Afrotemperate plant evolution and highlight the need for further research on understudied Afromontane taxa, especially under the threat of ongoing climate change.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- From Pleistocene Corridors to Isolated Peaks and Back: Biogeography of <i>Afrocarduus</i> (Compositae) in the Afromontane Archipelago
- Date Crossref
- 22/08/2025
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Institut Botànic de Barcelona pays non établi dans la noticeStructure de recherche
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Universitat Autònoma de Barcelona pays non établi dans la noticeUniversité ou école supérieure
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University of Oslo Natural History Museum pays non établi dans la noticeUniversité ou école supérieure
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Norsk Teknisk Museum pays non établi dans la noticeInstitution
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Norwegian Institute of Bioeconomy Research pays non établi dans la noticeOrganisme public
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Universidad Autónoma de Madrid pays non établi dans la noticeUniversité ou école supérieure
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Botanic Institute of Barcelona (IBB) pays non établi dans la noticeStructure de recherche
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Autonomous University of Barcelona Systematics and Evolution of Vascular Plants (UAB)—Associated Unit to CSIC by IBB Cerdanyola del Vallès Spain pays non établi dans la noticeUniversité ou école supérieure
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Department of Biology Autonomous University of Madrid Madrid Spain Department of Biology pays non établi dans la noticeUniversité ou école supérieure
Institut Botànic de Barcelona, Universitat Autònoma de Barcelona et Natural History Museum — University of Oslo, avec 6 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.