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 51 for “"population differentiation"”.
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Latitudinal Gradient Facilitates Adaptive Population Differentiation of Campanulastrum americanum (American Bellflower)
… of five northern and four southern C, americanum populations. These populations were reciprocally transplanted into two common garden sites positioned in the most northern and southern extent of the species distribution: Hastings, MI and Columbus, GA. I observed adaptive population differentiation …
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Molecular drive and population differentiation of satellite DNAs in Cyprinodon variegatus
The genome of the Atlantic sheepshead minnow, <u>Cyprinodon variecratus</u> (cyprinodontidae) contains at least two highly repetitive satellite DNA sequences. The major satellite sequence is present at roughly 10<sup>6</sup> copies per haploid genome. The basic repeating unit averages 170 bp in …
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Phenotypic plasticity and population differentiation in Suaeda maritima on a salt marsh
… the phenotypic variations within and between its populations in the heterogeneous microenvironments of a salt marsh. Detailed field characterizations of the growth, seed production and seed heteromorphism of four Suaeda maritima populations at Stiffkey salt marsh were conducted over three …
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Population differentiation, dispersal limitation, and local adaptation in the gametophytic fern Vittaria appalachiana
… characterized by limited dispersal potential and populations that are differentially adapted may be especially sensitive to the anticipated environmental changes associated with global climate change. ^ Here, we used a variety of field and common garden experiments to understand how a fern species …
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Gene flow and population differentiation in two species of goodeid fishes (Cyprinidontiformes: Goodeidae)
The role of gene flow in population differentiation was examined by electrophoretic analysis of populations of two species of goodeid fishes, Goodea atripinnis and Chapalichthys encaustus, from lakes and streams on the Mesa Central of Mexico. Microgeographic differentiation was observed among …
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The spatial scale of adaptive population differentiation in Atlantic Salmon: local adaptation in smolt migration timing
… identifying the spatial scale and extent of population genetic structuring in the species and linking this to variation in migratory behaviour.<br/>From a purely academic perspective, investigation of local adaptation in run timing is important because it reflects a central component of the …
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Landscape genomics of tropical high altitude plant species
… generations and affect allele frequencies within populations, leading to patterns of genetic restructuring. The specific genetic structuring patterns that will be observed as a consequence depend on explicit geographical features, such as topography and latitude. Over the first decades of …
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Comparative molecular genetics of the German Shepherd dog
… were used to measure genetic diversity and population differentiation within and between domestic dog breeds. The German Shepherd Dog was compared with typical outbred mongrel dogs, Dachshunds, Staffordshire Bull Terriers and a cohort of other pedigreed dogs representing 30 recognised …
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Analysis of within-host evolution of Plasmodium Falciparum during treatment
… used to predict ACT/kelch 13 interactions. Population differentiation was done using Microsatellite analyzer to calculate FST and customized R scripts with the relevant population genetics packages were used in the analysis. For samples collected in 2013, Tajima’s D genomic summary statistic …
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The development of the single-strand conformation polymorphism (SSCP) technique to assess sequence level variation within the major histocompatibility complex (MHC) DRB1 gene in four South African buffalo (Syncerus caffer) populations
… (MHC) DRB1 gene in four South African buffalo populations. MHC gene products are involved in the immune response, and so variation within these genes provides information on the immunological fitness of the population under study. The aims of this study were: (i) to develop the SSCP technique; …
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Effects of Culverts on Brook Trout Genetic Diversity
… been recognized as an additional impediment to population persistence as movement between diverse habitat types has been identified as an alternative life-history strategy to maximize spawning and growth. Brook trout were genetically analyzed using a suite of 13 microsatellite loci above 7 …
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Genetic Diversity and Camptothecin Variation in Camptotheca Decaisne
… (CPT) variations within and among different populations and taxa, with tissues, season, and age; and (3) to determine the effects of environmental stress on the camptothecin production in Camptotheca. RAPD markers provide a powerful tool for the identification of some populations …
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Genetic variability in Douglas-fir based on molecular genetic markers and morphological traits
… by analyzing molecular genetic markers at the population level and by evaluation of quantitative traits in parent trees. Genetic variability in the natural populations of Douglas-fir in B.C. selected from three geographic regions (coastal, transitional, and interior) was assessed by analyzing …
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Molecular Population Genetics of the Atlantic Sand Fiddler Crab, Uca Pugilator, Along the Atlantic Coast
… variation is found between northern and southern populations along the eastern coast. This study was undertaken to determine the population genetic structure of U. pugilator and to determine whether these differences may have a genetic basis. The population structure of the fiddler crab was …
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Use of comparative proteomics to study a novel osteogenic nanotopography
… of surface topography in inducing bone cell differentiation for biomedical purposes. In orthopedic research, regeneration of bone defects can be performed in vitro using biomaterials. Third generation biomaterials aim not only to support tissue (first generation) and not only to be …
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Molecular Genetic Assessment of Population Structure, Paternity, and Sex Ratios for the Reddish Egret
… colonies of Reddish Egret to determine global population genetic structure. We analyzed 13 polymorphic satellites and used nine of them to accomplish seven goals: 1) to assess range wide population differentiation among Reddish Egret (Egretta rufescens) populations, 2) identify extent of gene …
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Population genetics of species on the genera Tursiops and Delphinus within the Gulf of California and along the western coast of Baja California.
This present study investigated the evolution of population genetic structure of two closely related cetacean species, bottlenose (Tursiops truncatus) and common dolphins (Delphinus spp.) within the Gulf of California (GC) and along the West Coast of Baja California. In this study, we found …
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Partitioning of multivariate phenotypes using regression trees reveals complex patterns of adaptation to climate across the range of black cottonwood (Populus trichocarpa)
… moderate to high (0.24 to 0.55) and significant population differentiation (QST > 0.3) suggested adaptive divergence. When climate variables were taken as predictors and the 12 traits as response variables in a multivariate regression tree analysis, aridity (Eref) explained the most variation, …
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The drivers of variation in susceptibility to the amphibian-killing fungus, batrachochytrium dendrobatidis
… global declines experienced by amphibian populations in recent decades. The threat posed by Bd extends into pristine regions, decimating populations naïve to the pathogen. The patterns of genetic variation in amphibians in natural habitats, and the degree to which this influences traits …
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