Species, speciation, and hybridization in toad-headed lizards of the Phrynocephalus przewalskii complex

dc.contributor.advisorFu, Jinzhong
dc.contributor.authorGozdzik, Agnes
dc.date.accessioned2020-12-03T15:26:20Z
dc.date.available2020-12-03T15:26:20Z
dc.date.copyright2004
dc.degree.departmentDepartment of Zoologyen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractMethods of species delineation have recently received renewed interest. Following recently outlined protocols, I test species boundaries in toad-headed lizards of the 'Phrynocephalus przewalskii' complex. MtDNA gene trees revealed four mitochondrial clades that correspond to the geographic distributions of traditionally identified 'P. frontalis, P. przeswalskii ' and 'P. versicolor'. Principal Component Analyses of metric and meristic traits were able to successfully differentiate ' P. frontalis' and 'P. przewalskii', but only in allopatric populations. Mantel tests reveal that metric morphology shows a significant association with mtDNA haplotypes. Congruence between mtDNA and morphological variation supports the presence of two species: 'P. frontalis' and 'P. przewalskii'. Intermediate morphology in individuals from sympatric populations of these lineages indicates hybridization in contact zones. Pliocene and Pleistocene glaciations played a large role in the evolutionary history of this group, followed by range expansion that brought these lineages into secondary contact and eventual hybridization.en_US
dc.identifier.urihttps://hdl.handle.net/10214/21736
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectspecies delineationen_US
dc.subjectspecies boundariesen_US
dc.subjecttoad-headed lizardsen_US
dc.subjectPhrynocephalus przewalskiien_US
dc.subjectmtDNAen_US
dc.subjectP. frontalisen_US
dc.subjectP. przeswalskiien_US
dc.subjectP. versicoloren_US
dc.subjectmorphological variationen_US
dc.subjecthybridizationen_US
dc.titleSpecies, speciation, and hybridization in toad-headed lizards of the Phrynocephalus przewalskii complexen_US
dc.typeThesisen_US

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