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 20 of 74 for “"geometric morphometrics"”.
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Ancestry determination using geometric morphometrics
… research, three-dimensional Procrustes based geometric morphometric methods are employed to investigate whether these techniques can classify ancestry in a forensic context using the cranium. Cranial landmark and semilandmark configurations, focused specifically on features routinely used to …
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Cranial Sexual Dimorphism in Hispanics Using Geometric Morphometrics
… to American Blacks and American Whites using geometric morphometric methods. Landmark data for American Blacks (N=75) and Whites (N=384) was obtained from the Forensic Anthropology Data Bank. The Hispanic sample was obtained from multiple sources, including two populations from Mexico (n=128), …
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Understanding the evolution of cymothoid isopod parasites using comparative genomics and geometric morphometrics
… evolution using museum specimens.First, we use a geometric morphometric approach to quantify morphological variationvAbstractin attachment appendages, and relate this to the different parasitic strategies and phy-logeny. In the process of producing mitogenome reference sequences for cymothoids,we …
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Geometric morphometrics for 3D dense surface correspondence: population comparisons of shoulder bone morphology
… on diagnosis and prognosis by the clinician. Geometric morphometrics (GM) is one of the fields that help to provide such population comparisons. In medical imaging and related disciplines, GM is commonly done using annotated landmarks or distances measured from 3D surfaces (consisting of …
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Identifying Myotis Species Using Geometric Morphometrics and its Implications for the Fossil Record and Conservation
… United States were analyzed using landmark-based geometric morphometrics. The species could be distinguished with a high degree of accuracy. Evidence was found of a phylogenetic signal in the morphology of the Neotropical and Nearctic <em>Myotis </em>sub-clades. There is also evidence of …
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Phylogenomics and Geometric Morphometrics Define Species Flocks of Snowtrout (Teleostei: Schizothorax) in the Central Himalayas
<p>Schizothorax (Snowtrout) is a genus of medium-sized minnows (Cypriniformes) inhabiting glacier-fed streams, rivers, and lakes in the Himalayas. There are more than 30 species of Schizothorax across the region. The speciation and diversity of the Snowtrout in the vast hinterlands of the Himalayan …
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Characterization of the facial phenotype associated with fetal alcohol syndrome using stereo-photogrammetry and geometric morphometrics
Fetal Alcohol Syndrome (FAS) is a clinical condition caused by excessive pre-natal alcohol exposure and is regarded as a leading identifiable and preventable cause of mental retardation in the Western world. The highest prevalence of FAS was reported in the wine-growing regions of South Africa but …
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Assessing the accuracy of the zygoma for estimating ancestry using geometric morphometrics in a South African sample
… size in a SA population using three-dimensional geometric morphometric analyses. A sample of 158 individuals were analysed from Bantu-speaking (BA), European (EA) and Mixed Ancestral (MA) South African groups. Males were larger in size than females, but no size differences were observed between …
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Cranial form evolution and functional adaptations to diet among papionins : a comparative study combining quantitative genetics, geometric morphometrics, and finite element analysis
… and tested using 3D finite element models and geometric morphometrics. Large scale deformations and cranial form are assessed using landmarks distributed over the cranium, and local strain distributions are assessed visually. Lastly, the association between cranial form, biomechanical …
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On The Cranial Osteology of <em>Eremiascincus</em> and Its Use For Identification.
… allometry in <em>Eremiascincus</em> using linear morphometrics, 4) using cranial morphometrics of skinks to deduce their phylogeny, and 5) using geometric morphometrics to distinguish between individual elements of <em>Eremiascincus</em> and <em>Ctenotus</em>. Although linear morphometrics is …
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Assessing the information content of fossilizable data, with a focus on the Asian origin and diversification of Glires (Mammalia)
… of phylogeny, biogeographic history, anatomy and geometric morphometrics. In the final chapter, I discuss the importance of my biogeographic, anatomical and phylogenetic results within the context of Glires evolution. I also recommend the inclusion of fossil data in total-evidence approaches where …
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Genetic and Morphological Analyses of Three Freshwater Mussel Species in Isolated River Drainages Across Appalachia
… delineation of the focal taxa was assessed using geometric morphometrics and decision tree and random forest analyses. Decision tree and random forest analyses identified periostracum color, nacre color, overall shape, and sex to be distinguishing factors for field identification of L. ortmanni …
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Ties that bind: investigating Hyksos provenance and migration using dental morphology.
… was complimented with an application of 2D geometric morphometrics, comparing shapes in multidimensional space. Dental data was recorded on all available individuals from Tell el-Dab’a (n=96) for an intra-site and inter-site (total number of individuals n= 1095) analysis. C.A.B Smith’s mean …
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Factors Promoting Variation in Feeding Morphology of Larval Southern Toads (Bufo Terrestris)
… three different shade environments. Linear and geometric morphometrics were used to quantify chondrocranial morphology for a group of specimens representing a range of ontogenetic stages, and for prometamorphic specimens as well. The results of this study indicate that diet (directly) and shade …
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Exploring the morphospace of cidaroid echinoid spines.
… quantify trends in morphology through time, 2D geometric morphometrics were applied to cidaroid spines to track changes in morphospace. This was completed through four anatomical landmarks and 250 semi-landmarks to grasp the entirety of the spine shape. Once plotted into multivariate space, …
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Landmark Analysis of Musteloid Carnassials Applied to Taxonomic Identification and Examination of Sexual Dimorphism and Regional Morphotypes
… carnassial from GWC appeared to be musteloids. Geometric morphometrics has been successfully used to identify fragmentary fossils, so a landmark based, 2 dimensional technique was applied to identify the GWC musteloids using the lower carnassial. Digital images of several GWC fossils and of …
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Analysis of the Blancan Procyonids of Florida
… Fossils are analyzed using linear and 2D geometric morphometrics and compared with a large sample of modern specimens from a wide geographic area to understand the range of intraspecific variation. The large <em>Procyon </em>species is described as a new taxon based on morphology of the …
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Reproductive Life History and Shell Shape Variation of Three Species of Elimia (Pleuroceridae) in the Lower Etowah River Basin
… be monitored. Shell shape was assessed using Geometric Morphometrics. Although there was some overlap, shell shapes differ significantly among the three forms. Shell sculpture differences appear early in juvenile forms and the three species are distinguishable by the establishment of the …
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Under the trapdoor - resolving the taxonomy and phylogeography of the trapdoor spider genus Stasimopus (Mygalomorphae: Stasimopidae) of the Karoo
… reason, species delimitation methods as well as geometric morphometrics were explored to find ways to aid species identification. Multiple coalescent based species delimitation methods were used in chapter 2 to attempt to determine the number of different species present for Stasimopus in the …
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