Climatic oscillations, dispersibility and adaptability behind worldwide mountain radiations of the Helichrysum–Anaphalis–Pseudognaphalium (HAP) clade (Compositae)

作者：Carme Blanco‐Gavaldà, Renske E. Onstein, Luís Valente, Thijs Janzen, Santiago Andrés‐Sánchez, Nicola G. Bergh, Juan Antonio Calleja, Pau Carnicero, Òscar Castillo, G.V. Cron, Frédérik Leliaert, Lucía D. Moreyra, Genís Puig-Surroca, Sylvain G. Razafimandimbison, Alfonso Susanna, Cristina Roquet, Mercè Galbany‐Casals · 发表于：Annals of Botany · 年份：2025 · DOI：10.1093/aob/mcaf110 · 被引用次数：4 · 研究领域：Sesquiterpenes and Asteraceae Studies、Genetic diversity and population structure、Plant Diversity and Evolution

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 mu...