@ARTICLE{TreeBASE2Ref20513, author = {Steve Leavitt and Theodore L Esslinger and Thorsten Lumbsch}, title = {Neogene-Dominated Diversification in Neotropical Montane Lichens: Dating Divergence Events in the Lichen-Forming Fungal Genus Oropogon (Parmeliaceae).}, year = {2012}, keywords = {cryptic species; diversity; lichens; Mexico; Miocene; molecular dating; Oropogon ; Pleistocene; secondary metabolites; species boundaries.}, doi = {10.3732/ajb.1200146}, url = {http://}, pmid = {}, journal = {American Journal of Botany}, volume = {}, number = {}, pages = {}, abstract = {Premise of the study: Diversifi cation in neotropical regions has been attributed to both Tertiary geological events and Pleistocene climatic fluctuations. However, the timing and processes driving speciation in these regions remain unexplored in many important groups. Here, we address the timing of diversifi cation in the neotropical lichenized fungal genus Oropogon (Ascomycota) and assess traditional species boundaries. Methods: We analyzed sequence data from three loci to assess phenotypically circumscribed Oropogon species from the Oaxacan Highlands, Mexico. We provide a comparison of dated divergence estimates between concatenated gene trees and a calibrated multilocus species-tree using substitution rates for two DNA regions. We also compare estimates from a data set excluding ambiguously aligned regions and a data set including the hyper-variable regions in two ribosomal markers. Key results: Phylogenetic reconstructions were characterized by well-supported monophyletic clades corresponding to traditionally circumscribed species, with the exception of a single taxon. Divergence estimates indicate that most diversifi cation of the sampled Oropogon species occurred throughout the Oligocene and Miocene, although diversifi cation of a single closely related clade appears to have occurred during the late Pliocene and into the Pleistocene. Divergence estimates calculated from a data set with ambiguously aligned regions removed were much more recent than those from the full data set. Conclusions: Overall, our analyses place the majority of divergence events of Oropogon species from the Oaxacan Highlands within the Neogene and provide strong evidence that climatic changes during} }

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