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 29 for “"Population Structures"”.
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Stability of Canonical Weights: A Monte Carlo Study
… was carried out over four different population structures encompassing five different battery sizes. Two important and concrete notions were fully treated, the Tucker canonical subspace and its stability, and the derivation for the variance of the first canonical weight of the …
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Some effects of subdivision of finite populations on genetic diversity measures
… genetic drift and mutation in subdivided populations are considered in terms of the infinite-alleles Wright-Fisher model.;Moments of the multidimensional frequency spectrum of order n correspond to probabilities of identity for n genes drawn from specified subpopulations. Recursions are …
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Population Structure of Yellow Fever Virus: Influence of Viral Diversity on Vaccine Attenuation
… the lifecycle of RNA viruses have indicated that population structure of these viruses is in many cases complex, which in itself may confer fitness within hosts or host ecologies. Thus, these dissertation studies were performed under a set of hypotheses that the YFV population structure is in …
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Food, Growth, and Reproduction of White Crappies (Pomixis Annularis) and Black Crappies (P. Nigromaculatus) in Lake Poinsett, South Dakota
… habits, food selectivity, growth, condition, and population structures of the white crappies (Pomoxis annularis) and black crappies (P. nigromaculatus) in Lake Poinsett, South Dakota, were studied from May, 1975, to May, 1976. The total food volume of 173 adult white crappies consisted of 59.0% …
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Movement of Forage Fishes in a South Dakota Stream
… and a multiple census method were employed. Population structures were estimated for each species. Populations were considered unstable due to the occurrence of appreciable emigration and immigration between sampling periods. Differential size class mobility was established for all species. …
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Fish Populations of Two Small Impoundments in Northeastern South Dakota
… Abbey Pond and Labolt Pond, South Dakota. Adult population was estimated to be 5184 fish in Abbey Pond and 5016 in Labolt Pond. Composition of the populations differed. Black crappies were most numerous in Abbey Pond; white crappies, in Labolt Pond. Total standing crop of adult fish in Abbey Pond …
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Multiscale modeling of microbial communities
… cells drive the emergence of community structures, resulting in an intricate relationship across multiple spatiotemporal scales. Here, I present my work towards developing and applying the tools necessary to model the complex dynamics of bacterial communities. In Chapter 2, I utilize a …
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Algorithms for Reconstructing Biological History from Genomic Data
… problems for explaining the history of human populations at different scales. First, we present sample complexity results for learning population structures given pairwise coalescence data. The second involves pedigree reconstruction, in which we prove that there is a sample-efficient …
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THE FUNCTIONAL ROLE OF ASTERIAS VULGARIS VERRILL (1866) IN THREE SUBTIDAL COMMUNITIES
… on in-situ observations included an analysis of population structures, feeding biology, flux rates, predators and natural history of Asterias vulgaris in the 3 communities. The feeding data shows a series of prey specializations by size such that a progression of specialization on increasingly …
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Adaptive Functional Data Analysis
… that adapt to individual observations or unknown population structures are attractive due to both numerical and theoretical advantages over their non-adaptive counterparts. In this thesis, we contribute to adaptive modeling of functional data, focusing on the fundamental aspects of representation …
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Population ecology of landlocked Arctic charr, <i>Salvelinus alpinus L</i>., in the Canadian High Arctic
… subsequent modelling activities. Four landlocked populations of Arctic charr, <i>Salvelinus alpinus</i> L., were surveyed at 81 oN, close to the northerly extreme of the species range. They were single-species populations consisting of two distinct size modes, "Dwarf" and "Normal" charr, but with …
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Emerging Variants and Fading Immunity: Analyzing the Impact in Epidemic Modeling
… insights into how an epidemic affects the population. This thesis considers both epidemic spread and epidemic severity, and integrates fading immunity into the epidemic model, creating a more realistic representation of real-life scenarios. This research also extends the model by …
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Comparison of Creel Survey Data to Traditional Sampling Techniques in Pit-Lake Fisheries of Muhlenberg County, Kentucky
<p>Populations of largemouth bass, <em>Micropterus salmoides</em>, and bluegill, <em>Lepomis macrochirus</em>, were evaluated from five pit-lakes in Muhlenberg County, Kentucky, to determine if accurate proportional stock density (PSD) data can be obtained from a mandatory creel survey. It was …
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Development of prairie cordgrass (spartina pectinata link) as a dedicated bioenergy crop
… its genetic resources, natural prairie cordgrass populations collected from the Midwest to east coast of U.S. were planted and evaluated in an experimental nursery at Urbana, IL. The 4-year field study of 42 prairie cordgrass natural populations revealed extensive variations in biomass yield and …
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Development of tools to study the association of transposons to agronomic traits
… marker system that is able to cluster rice populations similar to a classical SNP marker approach. This system can also detect association peaks that are equivalent to the ones produced by SNP markers. 'TE-marker' is a novel complementary approach to the classical SNP markers that it assists …
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The role of landscape structure in determining eco-evolutionary dynamics during environmental change
… change may produce a variety of responses in populations' ecological and evolutionary dynamics. At opposing limits of populations' ranges, the responses are expected to differ. Some lag in response may be expected due to the rapidity of climate change, with the strength and type of lags …
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The Utility of Cranial and Dental Data in an Integrated Approach to Population Affinity
… to what extent these data types reflect similar population structures. This knowledge gap is significant considering most researchers treat these data types as interchangeable when exploring population relationships and estimating group membership in an applied context. As forensic …
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Multidimensional and Persistent Poverty: Methodological Approaches to Measurement Issues
… it evaluates the effect of different demographic population structures on societal multidimensional deprivation incidence comparisons. The results of this evaluation demonstrate that societal multidimensional comparisons reflect not only differences in relative deprivation but also differences in …
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Productivity, metabolism and physiology of free-living chemoautotrophic Epsilonproteobacteria
… biosphere were estimated. Finally, the population structures of the most abundant genera Sulfurimonas and Thioreductor were shown to be strongly influenced by pO2 and temperature respectively, providing a mechanism for niche differentiation in situ. To gain insights into the core …
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Bacterioplankton in the Chesapeake Bay: Genetic diversity, population dynamics and community proteomics
… little is known about the genetic diversity, population dynamics and metabolic activity of bacterioplankton living in the Bay. In this study, clone libraries containing the rRNA operon (16S rRNA-ITS-23S rRNA) were constructed from samples collected from the Chesapeake Bay to study spatial and …
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