Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Morphological divergence"”.
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The genetic mechanisms that coordinate the development and morphological divergence of Drosophila genital structures
… the genetic differences causing phenotypic divergence are not well understood. Drosophila simulans and D. mauritiana exhibit striking morphological differences in the size, shape, and bristle composition of the male periphallic genitalia, despite only diverging 240,000 years ago. In my PhD …
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The Effect of Isolation by Waterfalls and Dams on Stream Fish Morphology
… and the related effect of isolation time on morphological divergence by comparing fish associated with older barriers (waterfalls) to very new barriers (dams). These effects were investigated in five species from the southern Lake Superior basin. Geometric morphometric techniques were used to …
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MODERN MORPHOLOGICAL TECHNIQUES AND THE EVOLUTIONARY BIOLOGY AND TAXONOMY OF SEPSIDAE (DIPTERA)
… that sexual selection highly increases morphological divergence by quantifying and comparing the rates of evolution between sexually dimorphic structures that are likely to be under sexual selection and monomorphic structures that are mostly under viability selection. Third, I explore …
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Morphological Variation and Community Science in Orthoptera
<p>Patterns of morphological divergence across species’ ranges provide insight into local adaptation and speciation. Here, we compare phenotypic divergence among 4,221 crickets from 337 populations of two related species of field cricket, Gryllus firmus and G. pennsylvanicus and their hybrids. We …
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Speciation Genomics in Australian Meliphagoid Birds
… through a continuum of increasing genomic divergence and decreasing gene flow between populations. While sampling across hybrid zones provide insight for an intermediate stage of speciation, comparative studies of multiple contact zones between populations at different stages of speciation …
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Speciation Genomics in Australian Meliphagoid Birds
… through a continuum of increasing genomic divergence and decreasing gene flow between populations. While sampling across hybrid zones provide insight for an intermediate stage of speciation, comparative studies of multiple contact zones between populations at different stages of speciation …
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Population genetics of the genus Transennella (Bivalvia)
… the sample sizes employed, The amount of genetic divergence found between the morphotypes is comparable to interspecific estimates made for a variety of invertebrate species. The results indicate that the morphological divergence apparent in the two morphotypes has been accompanied by substantial …
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Morphometric Characterization of a <i>Mercenaria</i> spp. (Bivalvia) Hybrid Zone: Paleontological and Evolutionary Implications
… to control for processes that may also result in morphological intermediates at ecological time scales (dimorphism, ecophenotypy, and geographic variation). Four alternative causal explanations of morphological intermediates through geological time (primary intergradation, uncoupled genetic and …
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Avian ecology and rapid morphological change in a novel plant-frugivore system
… form and function may change as they experience morphological change. My research aimed to describe the rapid morphological change of the main frugivorous birds on the Hawaiian Island of Oʻahu where all native frugivores have gone extinct. To understand how the morphological changes may influence …
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The role of modularity and integration in shaping primate pelvic girdle evolution
… (the organisation of integrated units) on the morphological evolution of the primate pelvis. The concepts of integration and modularity are core tenets of evolutionary biology, yet their evolutionary role remains poorly understood. In this thesis, I quantified primate pelvis morphological …
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The Life History of Damaraland Mole-rats Fukomys damarensis: Growth, Ageing and Behaviour
… from reproductive suppression, this adaptive morphological divergence is achieved through a lengthening of the lumbar vertebrae when breeding is commenced (Chapter 5). With contrasts in size and shape following the acquisition of the breeding role, this status-related growth pattern shares …
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Systematics and Species Delimitation in New Guinea Skink Species Complexes (Squamata: Scincidae)
… be highly accurate in identifying even recent divergences with limited sampling of individuals and of loci, and that Gaussian clustering can be similarly accurate, though somewhat less sensitive to detecting recent divergences. However, my results show that nonparametric delimitation is highly …
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Endocranial volume and shape variation in early anthropoid evolution
… 2) encephalization, which influenced subsequent morphological divergence among extant anthropoid groups.</p>