A phylogenetic and biogeographic analysis of Sanguisorbeae (Rosaceae), with emphasis on the Pleistocene radiation of the high Andean genus Polylepis.

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dc.contributor.advisorDelwiche, Charles Fen_US
dc.contributor.advisorReveal, James Len_US
dc.contributor.authorKerr, Malin Sofiaen_US
dc.contributor.departmentCell Biology & Molecular Geneticsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2004-07-16T05:17:50Z
dc.date.available2004-07-16T05:17:50Z
dc.date.issued2004-06-16en_US
dc.description.abstractA phylogenetic and biogeographic analysis of the tribe Sanguisorbeae (Rosaceae) was conducted with emphasis on the radiation of the Andean tree Polylepis. Phylogenetic analyses of coding and non-coding nuclear markers reveal a complex evolutionary history of the tribe including ancient and recent allopolyploid hybridization. Sanguisorba sensu lato is shown to be paraphyletic and split between the allopolyploid hybrid Sanguisorba and the non-hybrid Poterium and Poteridium. A monophyletic origin of the southern hemispheric subtribe Sanguisorbinae is supported, and this clade is given a phylogentic taxon name (Verruchaena). Dating analyses using the penalized likelihood method suggest that this taxon originated in the late Miocene. A biogeographic hypothesis is presented in which Verruchaena originated in the New World with subsequent transoceanic dispersals to southern Africa and Australasia. The paramo genus Polylepis most likely arose from hybridization between two Andean ancestors supporting a "vertical" rather than "horizontal" origin of this taxon.en_US
dc.format.extent2807373 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/1678
dc.language.isoen_US
dc.subject.pqcontrolledBiology, Botanyen_US
dc.subject.pquncontrolledSanguisorbeaeen_US
dc.subject.pquncontrolledPolylepisen_US
dc.subject.pquncontrolledRosaceaeen_US
dc.subject.pquncontrolledallopolyploidyen_US
dc.subject.pquncontrolledhybridizationen_US
dc.subject.pquncontrolledAdhen_US
dc.titleA phylogenetic and biogeographic analysis of Sanguisorbeae (Rosaceae), with emphasis on the Pleistocene radiation of the high Andean genus Polylepis.en_US
dc.typeDissertationen_US

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