Climatic oscillations, dispersibility and adaptability behind worldwide mountain radiations of the Helichrysum–Anaphalis–Pseudognaphalium (HAP) clade (Compositae)
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Le résumé fourni par la source
BACKGROUND AND AIMS: Mountain ecosystems are recognised as biodiversity hotspots. However, the origins of their remarkable diversity remain unresolved. We explore this question by focusing on the HAP clade (Helichrysum-Anaphalis-Pseudognaphalium), a megadiverse lineage within the Compositae family that spans tropical and temperate mountain and lowland systems worldwide. The existence of multiple high-elevation clades provides an opportunity to address hypotheses regarding the impact of trait innovation, climatic oscillations, dispersal and niche lability in the diversification of mountain lineages. METHODS: To investigate the biogeographic history and diversification dynamics of the HAP clade, we built a time-calibrated phylogeny of 560 taxa (62% of the species) based on 989 nuclear loci. We examined the frequency of inter-mountain dispersal and lowland-to-mountain transitions and vice versa, tested whether diversification rates were dependent on time, climate or species diversity, and assessed the impact of bract colour on diversification rates using state-dependent speciation-extinction models. Additionally, we reconstructed the evolutionary history of two functional traits (bract colour, life form) and ecological preferences (elevational range, habitat) and explored potential correlations between them. KEY RESULTS: The HAP clade extensively speciated during the Pleistocene, when net diversification rates nearly quadrupled, coinciding with parallel mountain radiations on multiple continents. The clade followed a pattern of nested radiations, with southern African mountains serving as initial diversity source and other mountain systems acting primarily as sinks. High-elevation ecosystems also contributed to lowland biodiversity. Diversification rates in high-elevations are independent of bract colour, yet significant trait-environment associations were supported. Functional traits and ecological preferences evolved repeatedly, with a tendency toward montane open habitat ecologies and chamaephytic life forms. CONCLUSIONS: Our findings suggest that mountains do not fit the classic island model for the HAP clade due to its high permeability across heterogeneous environments, high dispersibility and ability to thrive in both high- and low-elevations. However, the clade's evolutionary lability enabled repeated trait acquisition, niche shifts and microhabitat specialisation. This, coupled with Pleistocene climatic instability, likely played a significant role in driving allopatric and ecological speciation at different geographical scales.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé, mais le titre doit être comparé manuellement.
- Titre Crossref
- Climatic oscillations, dispersibility and adaptability behind worldwide mountain radiations of the <i>Helichrysum–Anaphalis–Pseudognaphalium</i> (HAP) clade (Compositae)
- Date Crossref
- 31/05/2025
- Éditeur
- Oxford University Press (OUP)
- 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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Universitat Autònoma de Barcelona pays non établi dans la noticeUniversité ou école supérieure
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Naturalis Biodiversity Center pays non établi dans la noticeInstitution
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German Centre for Integrative Biodiversity Research pays non établi dans la noticeStructure de recherche
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University of Groningen Groningen Institute for Evolutionary Life Sciences pays non établi dans la noticeUniversité ou école supérieure
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Universidad de Salamanca pays non établi dans la noticeUniversité ou école supérieure
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South African National Biodiversity Institute 7735 Cape Town, Afrique du Sud (code pays fourni par la source)Structure de recherche
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National Biodiversity Institute pays non établi dans la noticeOrganisation à but non lucratif
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Universidad Autónoma de Madrid pays non établi dans la noticeUniversité ou école supérieure
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Universität Innsbruck pays non établi dans la noticeUniversité ou école supérieure
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University of the Witwatersrand University of the Witwatersrand, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
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Meise Botanic Garden pays non établi dans la noticeInstitution
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Institut Botànic de Barcelona pays non établi dans la noticeStructure de recherche
Universitat Autònoma de Barcelona, Naturalis Biodiversity Center et German Centre for Integrative Biodiversity Research, avec 9 autres affiliations. Pays d’affiliation : Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.