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.
Results
Showing 1 to 20 of 54 for “"effective population size"”.
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Temporal Comparisons on the Genetic Variation of the Dusky Gopher Frog (Lithobates sevosus)
… temporal changes in genetic diversity within populations can provide vital information on future viability. The dusky gopher frog, Lithobates sevosus, exists in isolation with an estimated population size of 100-200 individuals, and previous research has shown that low genetic variability …
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Inferring Genomic Histories of Structured Populations: Lessons from the Hominids
… how it effects the genetic composition of populations allows us to infer history from genetic data. I contribute to this project in three ways. First, I estimate the historical trajectories of effective population size in Pan and Pongo. These analyses are based on past rates of coalescence, …
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Genetic variation within the Icelandic goat breed: assessment using population data and DNA analysis
The Icelandic goat breed is a very small closed population consisting of only about 500-600 animals kept in 45 herds. The breed is believed to have originated from Norway during the settlement of Iceland in the years 874-930 AD. Several population bottlenecks are known to have occurred and the …
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Development of a Genetic Monitoring Program for Stock Enhancement of Mississippi Spotted Seatrout (<i>Cynoscion nebulosus</i>)
… is a function of geographic distance between populations. Contemporaneous effective population size estimates were larger in Mississippi and Louisiana than in Florida suggesting that population density and/or dispersal may be greater in the western part of the sampled range. Further …
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The genomics behind beauty: disentangling the complex coat color genetic architecture of gir breed
… signaling pathways. Within the context of population genomics, parameters such as linkage disequilibrium (LD) and effective population size (Ne) allow the characterization of population genetic structure, whereas genome-wide association studies (GWAS) enable the investigation of the genetic …
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Conservation genetics of a spotted salamander (Ambystoma maculatum (Shaw 1802)) local population in southeast Tennessee
… how genetic variation in local amphibian populations is affected by disturbance. The goal of this study was to assess the genetic impacts of past chemical and ammunition storage and present industrialization on a local population of Ambystoma maculatum (Shaw 1802) using thirteen …
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Population Genetics of Death Valley Pupfishes (Cyprinodontidae:Cyprinodon Spp.) and the Identification of a New Retrotransposable Element Family
… and evolutionary histories of pupfish populations (Cyprinodontidae: Cyprinodon spp.) from the remnant aquatic habitats of Death Valley was approached by exploring the genetic structure and divergence within and among populations using mitochondrial and nuclear DNA markers. The findings …
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Proximate Causes of Alternative Reproductive Tactics in Blue Ridge Two-Lined Salamanders (Eurycea cf. wilderae)
… explores the proximate causes of ARTs in a population of <em>E.</em> cf. <em>wilderae</em> from the Blue Ridge of North Carolina. The first chapter of this thesis surveys for a genetic cause for these ARTs. In this chapter, I use genomic data to evaluate population structure, identify …
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Brook Trout Population Genetic Tools for Natural Barriers in Fragmented Subwatersheds
… my research was to investigate applications of population genetic analysis tools as indicators of barrier effects on brook trout populations in fragmented subwatersheds. In chapter1, I tested the hypothesis that brook trout population genetic differentiation (FST) above and below barriers will …
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Comparative Genomics Insights into Speciation and Evolution of Hawaiian Drosophila
… role of adaptive changes, founder effects (small effective population size in isolation), and genetic admixture during speciation.
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Conservation Genetics and Distribution of the Yazoo Darter (Etheostoma Raneyi)
… used genetic methods to quantify contemporary population structure, genetic variation, and gene flow throughout the range of the species, estimated contemporary migration rates and effective population sizes, and have compared them to historic estimates before habitat modification and …
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Patterns of Archaic Hominin DNA in Modern Human Genomes
… the application of this method to several populations. In 15 African hunter-gatherer genomes, I identify signatures of introgression from an unknown archaic hominin with an apparent divergence time with modern humans that is similar to the divergence time of Neanderthals. In a sample of 379 …
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Genetic Diversity of Blue Wildebeest (Connochaetes taurinus) in the Liuwa Plain of Zambia
… the amount of genetic diversity present in a population, connectivity between populations, and historical demographic changes. The blue wildebeest (<em>Connochaetes taurinus</em>) plays an important ecological role in many African savanna ecosystems, but little is known about the level of …
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Ancestral Paths: Redefining local genetic ancestry and its inference with application to Europeans
… have transformed our understanding of human population history. Firstly, the sequencing of ancient genomes which gives us a snapshot of past genetic variation. We can therefore make inferences from observed genetic signatures present before historical events such as population bottlenecks and …
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Population Genetics and Conservation of Texas Hill Country Eurycea
… and nuclear sequence variation of seven Eurycea populations to address the following questions: 1) to what extent does gene flow occur among these populations?, 2) do river systems or aquifers serve as conduits for gene flow in this system?, and 3) what is the status of each population, measured …
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Back to the future? Unravelling current and potential future declines of the common toad, Bufo bufo, in the UK
… and many aspects of the species demography and population structure at local scale are unknown. In this thesis, neutral genetic markers were used to investigate broad scale genetic diversity and population structure of B. bufo populations across Great Britain. This project relied partially on …
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Gene duplication and the evolution of the higher diptera
… the higher Diptera due to an extended period of effective population size reduction.</p>
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Genetic Structure of the Copperhead (Viperidae: Agkistrodon Contortrix Mokasen) at its Most Northern Distribution
… Our study will also provide insight into the population genetics of a peripheral population to supplement previous studies regarding the Central-Peripheral Hypothesis and the importance of adaptive genetic variation in peripheral populations as a hedge for environmental change. We employed 23 …
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From genes to species: Characterizing spatial and temporal variation in frog and toad multidimensional biodiversity
… variation of genetic diversity and other population genetic metrics to understand the effects of multi-year sampling on population genetic inference in an anuran metapopulation (Arizona treefrog, Hyla (Dryophytes) wrightorum). I found that a single sample year captures global, but not …
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Variation in Egg Components: A Study of Maternal Investment and Resource Partitioning in the Nesting Loggerhead Sea Turtle; Estimating Genic Variation and Mapping Genetic Lineage of a Rare Captive Helodermatid Population: <em>Heloderma Horridum Charlesbogerti</em>
… change in dried egg components, hatchling size was conserved across the nesting season. This study shows that maternal condition declined across the nesting season and this decline correlated with the decrease in egg size, specifically the amount of water allocated to eggs. Late season …
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