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- W3156376026 abstract "Premise Joshua trees (Yucca brevifolia and Y. jaegeriana) and their yucca moth pollinators (Tegeticula synthetica and T. antithetica) are a model system for studies of plant–pollinator coevolution and, they are thought to be one of the only cases in which there is compelling evidence for cospeciation driven by coevolution. Previous work attempted to evaluate whether divergence between the plant and their pollinators was contemporaneous. That work concluded that the trees diverged more than 5 million years ago—well before the pollinators. However, clear inferences were hampered by a lack of data from the nuclear genome and low genetic variation in chloroplast genes. As a result, divergence times in the trees could not be confidently estimated. Methods We present an analysis of whole chloroplast genome sequence data and RADseq data from >5000 loci in the nuclear genome. We developed a molecular clock for the Asparagales and the Agavoideae using multiple fossil calibration points. Using Bayesian inference, we produced new estimates for the age of the genus Yucca and for Joshua trees. We used calculated summary statistics describing genetic variation and used coalescent-based methods to estimate population genetic parameters. Results We find that the Joshua trees are moderately genetically differentiated, but that they diverged quite recently (~100–200 kya), and much more recently than their pollinators. Conclusions The results argue against the notion that coevolution directly contributed to speciation in this system, suggesting instead that coevolution with pollinators may have reinforced reproductive isolation following initial divergence in allopatry." @default.
- W3156376026 created "2021-04-26" @default.
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- W3156376026 date "2021-04-01" @default.
- W3156376026 modified "2023-10-12" @default.
- W3156376026 title "Genome‐scale data resolves the timing of divergence in Joshua trees" @default.
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- W3156376026 doi "https://doi.org/10.1002/ajb2.1633" @default.
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