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dc.contributor.advisorGalen, Candace Elizabetheng
dc.contributor.authorDudley, Leah S., 1977-eng
dc.date.issued2006eng
dc.date.submitted2006 Springeng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file viewed on (February 27, 2007)eng
dc.descriptionVita.eng
dc.descriptionThesis (Ph.D.) University of Missouri-Columbia 2006.eng
dc.description.abstractThis thesis explores the dimorphic niche of ecological conditions hypothesis as the selective force behind secondary sexual dimorphism in Salix glauca, a dioecious willow shrub. The dimorphic niche hypothesis predicts trait difference between male and female plants based on sexual allocation theory. Sexual allocation's theory basic tenet is that each sex has unique reproductive demands and females allocate more resources overall to reproduction than males. I address this idea by first examining the main assumption of sexual allocation theory in a comparison of nutrient costs of male and female organs. Then, I examine possible divergence in traits related to a species fundamental niche: resource acquisition and tolerance of abiotic stress at two size stages, mature adults and small vegetative daughter clones. I investigated secondary sexual dimorphism in physiological traits over several years in a mosaic of mesic and xeric habitat patches at timberline in the Colorado Rocky Mountains (USA). Results support the view that gas exchange rates of female plants are maintained despite drought to support greater costs of reproduction whereas physiological plasticity allows male plants to occupy more arid environments. Finally, I examine whether sex morphs have diverged in defensive traits that are related to the realized niche in the presence of insect herbivores. I found little support for the idea that antagonist-related selection has resulted in intrasexual dimorphism, as predicted under the vigor hypothesis.eng
dc.description.bibrefIncludes bibliographical referenceseng
dc.identifier.merlinb57899472eng
dc.identifier.oclc85355744eng
dc.identifier.urihttps://doi.org/10.32469/10355/4382eng
dc.identifier.urihttps://hdl.handle.net/10355/4382
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.rightsOpenAccess.eng
dc.sourceSubmitted by University of Missouri--Columbia Graduate School.eng
dc.subject.lcshDimorphism (Plants)eng
dc.subject.lcshWillows -- Reproductioneng
dc.titleEcological conditions of secondary sexual dimorphism in salix glauca : fundamental and realized dimorphic nicheeng
dc.typeThesiseng
thesis.degree.disciplineBiological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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