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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 331 for “"gene flow"”.
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Climate Change, Gene Flow, and the Legendary Synchrony of Snowshoe Hares
… that have historically harbored species' highest genetic diversity and uniqueness. I investigated how climate change and habitat fragmentation may impact genetic and population dynamic processes for the snowshoe hare (Lepus americanus), a species historically recognized as a key driver of North …
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Climate Change, Gene Flow, and the Legendary Synchrony of Snowshoe Hares
… that have historically harbored species' highest genetic diversity and uniqueness. I investigated how climate change and habitat fragmentation may impact genetic and population dynamic processes for the snowshoe hare (Lepus americanus), a species historically recognized as a key driver of North …
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Conserving Connectivity: Ecological Determinants of Gene Flow in Plants at the Landscape Scale
… to manage landscapes in a way that maintains gene flow among previously continuous populations. This requires a detailed understanding of the scale of gene flow in nature and of how aspects of the landscape support or inhibit movement. In plants, gene flow occurs through both pollen and seed, …
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An Examination of Gene Flow Among Distinct Management Units of The Reddish Egret
… the northern part of South America. I examined gene flow and genetic diversity among populations across the range of the species. I specifically tested hypothesized distinct management units (Western, Central, and Eastern) based on geographic distributions and the findings of Hill et al. (2012). …
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Effects of Impoundments on the Community Assemblage and Gene Flow of Stream Crayfishes
… biological assemblages and creates barriers to gene flow. While changes in species assemblages and gene flow have been assessed for numerous impoundments and stream organisms, no study has assessed the effects of large impoundments on crayfish assemblages and population genetic diversity and …
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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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Intra-species genomic variations in hydrogen-oxidising bacteria is delineated by horizontal gene flow
… population. Therefore, discontinuities in gene flow in eukaryotes generally result in the formation of an ecologically and genotypically cohesive unit. In contrast, delineating asexual bacterial species is often hampered by extensive horizontal gene flow and is further confounded by the …
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The Effects of Geography, Environment and Phylogeny on Community Assembly and Gene Flow Dynamics
… affect community composition and patterns of gene flow in a unique system of Atlantic rainforest and restinga (sandy coastal plains) habitats in Southeastern Brazil.</p><p>In chapter one I investigate how space and environment affect the population genetic structure and gene flow of Aechmea …
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Testing assisted gene flow in restoration of winterfat, Krascheninnikovia lanata, a Great Basin desert shrub
… weed invasion can pose challenges for natural regeneration of native plant communities. To combat these challenges and increase the diversity and density of native plant communities, active restoration is used to restore landscapes, and increasingly, practitioners are considering the use of …
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Habitat modification and gene flow in Saimiri oerstedii: Landscape genetics, intraspecific molecular systematics, and conservation
… fragmentation, often results in the loss of genetic diversity due to reduced gene flow, inbreeding, and genetic drift. However, the severity of these effects depends on how diminished dispersal and gene flow become between patches of suitable habitat. An empirical understanding of how habitat …
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The Evolution of Natural Plant Communities through Crop Migration and Crop-to-weed Gene Flow
… has become vital to assuring food security. Genetically engineered (GE) crop varieties are broadly thought to be a solution for improving the efficiency of crop production, but concerns regarding their release have heightened as more discoveries have focused on the influence of genetically …
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A Comparison of Genetic Differentiation and Gene Flow Among Populations of Two Species of Mice (Peromyscus)
… populations of P. leucopus. Of the seventeen gene loci examined, seven polymorphic enzyme systems were found variable in P. attwateri and nine systems were found variable in P. leucopus. Results indicate that genetic similarities and differences among populations of P. attwateri are not …
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Determining Impediments to Gene Flow in a Natural Population of Cornus florida L. Cornaceae, Using Integrative Landscape Genetic Techniques
… the impact intervening environment has on gene flow in the insect pollinated understory tree, Cornus florida L., by combining GIS and landscape genetic techniques (Least Cost Path Analysis, Circuit Theory, and Conditional Genetic Distance). Traditional population genetic analysis indicated …
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Gene Flow and Dispersal Among Populations of the Stonefly <i>Peltoperla tarteri</i> (Plecoptera: Peltoperlidae) in the Southern Appalachians
… directly using traditional means; however, genetic markers provide an ideal method for estimating stream insect dispersal. In this study, the control region of mitochondrial DNA was used to study gene flow and dispersal among populations of the stonefly <i>Peltoperla tarteri</i> in the …
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Evolutionary impacts of assisted gene flow: Fitness consequences of hybridization along a geo-climatic gradient in an annual prairie legume
… population persistence. Populations with larger genetic variation likely have greater capacity for adaptation, but limited population sizes and restricted gene flow decrease this potential. Assisted gene flow (AGF) aims to increase adaptive capacity by introducing genetic material from …
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The genetic structure of New Zealand's coastal benthos: using the estuarine clam Austrovenus stutchburyi, to determine rates of gene flow and population connectivity
… disturbed or degraded habitats and achieve genetic exchange between geographically separated subpopulations. While it is widely accepted that the dispersal process is important in determining the dynamics of many marine communities, difficulties associated with the direct measurement of …
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Use of environmental variables to infer gene flow and population structure in the gopher tortoise (Gopherus polyphemus) and predict the seroprevalence of an emerging infectious disease
… use novel approaches from the field of landscape genetics to combine spatial genetic data with landscape data at both regional and local spatial scales to explore natural and anthropogenic landscape features that shape population structure and gene flow in a federally threatened reptile, Gopherus …
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