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dc.contributor.authorFolk, Ryan A.
dc.contributor.authorStubbs, Rebecca L.
dc.contributor.authorMort, Mark E.
dc.contributor.authorCellinese, Nico
dc.contributor.authorAllen, Julie M.
dc.contributor.authorSoltis, Pamela S.
dc.contributor.authorSoltis, Douglas E.
dc.contributor.authorGuralnick, Robert P.
dc.identifier.citationRyan A. Folk, Rebecca L. Stubbs, Mark E. Mort, Nico Cellinese, Julie M. Allen, Pamela S. Soltis, Douglas E. Soltis, Robert P. Guralnick, "Rates of niche and phenotype evolution lag behind diversification in a temperate radiation", Proceedings of the National Academy of Sciences May 2019, 116 (22) 10874-10882; DOI: 10.1073/pnas.1817999116en_US
dc.descriptionThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.en_US
dc.description.abstractEnvironmental change can create opportunities for increased rates of lineage diversification, but continued species accumulation has been hypothesized to lead to slowdowns via competitive exclusion and niche partitioning. Such density-dependent models imply tight linkages between diversification and trait evolution, but there are plausible alternative models. Little is known about the association between diversification and key ecological and phenotypic traits at broad phylogenetic and spatial scales. Do trait evolutionary rates coincide with rates of diversification, are there lags among these rates, or is diversification niche-neutral? To address these questions, we combine a deeply sampled phylogeny for a major flowering plant clade—Saxifragales—with phenotype and niche data to examine temporal patterns of evolutionary rates. The considerable phenotypic and habitat diversity of Saxifragales is greatest in temperate biomes. Global expansion of these habitats since the mid-Miocene provided ecological opportunities that, with density-dependent adaptive radiation, should result in simultaneous rate increases for diversification, niche, and phenotype, followed by decreases with habitat saturation. Instead, we find that these rates have significantly different timings, with increases in diversification occurring at the mid-Miocene Climatic Optimum (∼15 Mya), followed by increases in niche and phenotypic evolutionary rates by ∼5 Mya; all rates increase exponentially to the present. We attribute this surprising lack of temporal coincidence to initial niche-neutral diversification followed by ecological and phenotypic divergence coincident with more extreme cold and dry habitats that proliferated into the Pleistocene. A lack of density-dependence contrasts with investigations of other cosmopolitan lineages, suggesting alternative patterns may be common in the diversification of temperate lineages.en_US
dc.publisherNational Academy of Sciencesen_US
dc.rightsCopyright © 2019 the Author(s). Published by PNAS.en_US
dc.titleRates of niche and phenotype evolution lag behind diversification in a temperate radiationen_US
kusw.kuauthorMort, Mark E.
kusw.kudepartmentEcology & Evolutionary Biologyen_US
kusw.kudepartmentKU Biodiversity Instituteen_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US

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Copyright © 2019 the Author(s). Published by PNAS.
Except where otherwise noted, this item's license is described as: Copyright © 2019 the Author(s). Published by PNAS.