ArticleAnnals of botany2023
Inter- and intra-island speciation and their morphological and ecological correlates in Aeonium (Crassulaceae), a species-rich Macaronesian radiation.
Article in Annals of botany, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed.
- The extension of the taxon cycle model to island plants: insights from the Canarian vascular flora.Biological reviews of the Cambridge Philosophical Society · 2026Article
- Stronger expression of crassulacean acid metabolism (CAM) requires effective cuticular transpiration barriers but not necessarily strong succulence.The New phytologist · 2026Article
- Evolutionary Changes in Crassulacean Acid Metabolism (CAM) and Related Traits During the Diversification ofEcology and evolution · 2026Article
- A new phylogenetic framework for the genus Kalanchoe (Crassulaceae) and implications for infrageneric classification.Annals of botany · 2025Article
- Transition Processes in Technological Systems: Inspiration from Processes in Biological Evolution.Biomimetics (Basel, Switzerland) · 2025Article
- Speciation happens in company - not in isolation.npj biodiversity · 2024Review
- Atmospheric CO2 decline and the timing of CAM plant evolution.Annals of botany · 2023Article
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10 authors.
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Abstract
BACKGROUND AND
aimsThe most species-rich and ecologically diverse plant radiation on the Canary Islands is the Aeonium alliance (Crassulaceae). In island radiations like this, speciation can take place either within islands or following dispersal between islands. Aiming at quantifying intra- and inter-island speciation events in the evolution of Aeonium, and exploring their consequences, we hypothesized that (1) intra-island diversification resulted in stronger ecological divergence of sister lineages, and that (2) taxa on islands with a longer history of habitation by Aeonium show stronger ecological differentiation and produce fewer natural hybrids.
methodsWe studied the biogeographical and ecological setting of diversification processes in Aeonium with a fully sampled and dated phylogeny inferred using a ddRADseq approach. Ancestral areas and biogeographical events were reconstructed in BioGeoBEARS. Eleven morphological characters and three habitat characteristics were taken into account to quantify the morphological and ecological divergence between sister lineages. A co-occurrence matrix of all Aeonium taxa is presented to assess the spatial separation of taxa on each island. KEY
resultsWe found intra- and inter-island diversification events in almost equal numbers. In lineages that diversified within single islands, morphological and ecological divergence was more pronounced than in lineages derived from inter-island diversification, but only the difference in morphological divergence was significant. Those islands with the longest history of habitation by Aeonium had the lowest percentages of co-occurring and hybridizing taxon pairs compared with islands where Aeonium arrived later.
conclusionsOur findings illustrate the importance of both inter- and intra-island speciation, the latter of which is potentially sympatric speciation. Speciation on the same island entailed significantly higher levels of morphological divergence compared with inter-island speciation, but ecological divergence was not significantly different. Longer periods of shared island habitation resulted in the evolution of a higher degree of spatial separation and stronger reproductive barriers.
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