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• W2960580761 abstract "Ring species have long fascinated evolutionary biologists for their potential insights into lineage divergence and speciation across space. Few studies have investigated the potential for convergent or parallel evolution along the diverging fronts of ring species. We investigated a potential case of parallel floral variation in the Caribbean spurge Euphorbia tithymaloides, the only plant system with molecular support as a ring species. The terminal populations of each front, despite being the most divergent, exhibit such similar floral traits that they were originally considered each other's closest relative.We evaluated convergence in floral and leaf traits in relation to geography across 95 populations spanning the distribution of E. tithymaloides. We also reanalyzed available genetic data (from previous phylogenetic analyses) in an explicitly spatial framework.Floral morphology appears to have shifted in a convergent fashion along both geographic fronts of E. tithymaloides, resulting in shorter and more compact inflorescences in Antillean populations compared to the typical elongate slipper-like cyathia characteristic of the area of origin. Patterns of spatial genetic variation were more consistent with a two-fronted invasion of the Caribbean than with a simpler model of isolation-by-distance.Floral divergence in E. tithymaloides is consistent with convergent evolution along the two fronts of a ring species. We outline several (not mutually exclusive) mechanisms that could be driving patterns in morphology, including shifts toward generalized pollination with reduced reliance on hummingbirds, shifts in floral structure closely matching available hummingbird bill traits, and shifts toward increased selfing." @default.
• W2960580761 created "2019-07-23" @default.
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• W2960580761 date "2019-07-01" @default.
• W2960580761 modified "2023-10-12" @default.
• W2960580761 title "Convergent evolution in floral morphology in a plant ring species, the Caribbean<i>Euphorbia tithymaloides</i>" @default.
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• W2960580761 doi "https://doi.org/10.1002/ajb2.1318" @default.
• W2960580761 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31281963" @default.
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