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Rozprawy doktorskie na temat „Population structure”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Håkansson, Nina. "Population growth : analysis of an age structure population model." Thesis, Linköping University, Department of Mathematics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4392.

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<p>This report presents an analysis of a partial differential equation, resulting from population model with age structure. The existence and uniqueness of a solution to the equation are proved. We look at stability of the solution. The asymptotic behaviour of the solution is treated. The report also contains a section about the connection between the solution to the age structure population model and a simple model without age structure.</p>

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2

Cole-Showers, Curtis Lanre. "Population structure and demographics in Nigerian populations utilizing Y-chromosome markers." University of the Western Cape, 2014. http://hdl.handle.net/11394/5326.

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Philosophiae Doctor - PhD<br>Nigeria is peopled by ethnically and linguistically diverse populations of which little were known until the last few millennial. The absence of major natural geographical barrier increases the possibility of the populations being affected by the same demographic events. The aim of this thesis was to ascertain the genetic variations and demographics in five major Nigerian populations using Y-markers. This was done by determining the genetic structures of the Afro-asiatic speaking Hausa (n=78) of Northern Nigeria and the Niger Congo speaking populations of Igbo (n=1

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3

Sester-Huss, Elisabeth Mariko [Verfasser], and Peter [Akademischer Betreuer] Pfaffelhuber. "Population genetic models with selection, fluctuating environments and population structure." Freiburg : Universität, 2020. http://d-nb.info/1206095830/34.

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4

Piskol, Robert. "Structural and population genetic determinants of RNA secondary structure evolution." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-130532.

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5

McVeigh, Helen Patricia. "Mitochondrial DNA and salmonid population structure." Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.352951.

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6

Watkins, Eleanor Rose. "The population structure of bacterial pathogens." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:8ab53aa1-c55f-40bc-ab4f-ec2766b37252.

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Populations of many bacterial pathogens are structured into discrete strains despite frequent genetic exchange. Although insights from several studies suggest that different selection pressures operate in different areas of the genome, few theoretical and conceptual frameworks of bacterial population structure examine the effects of distinct competitive processes acting on different loci in the genome, and fewer still have considered the metabolic genes despite their increasingly-recognised importance in virulence. Buckee et al. (2008) investigated the combined effects of ecological competitio

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7

Baric, Michelle B. "Population Structure in the Cincinnati area." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367945142.

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8

Morgan, Lee W. "Allozyme Analysis of Billfish Population Structure." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539617645.

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9

Nussey, Daniel H. "Phenotypic plasticity and population genetic structure in a wild vertebrate population." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/15544.

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My thesis focuses on maternal phenotypic plasticity in two neonatal traits and population genetic structure at different spatial scales in a wild red deer <i>(Cervus elaphus) </i>population on the Isle of Rum, Scotland. Specifically, I present: • An analysis of offspring birth weight-spring temperature plasticity in female red deer using linear regression to measure individual reaction norms. I found evidence of variation in plasticity between females and show that early experiences of high population density reduce female plasticity. • The description of a mixed-effects linear model approach

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10

Beisswanger, Steffen. "Selection and population structure in Drosophila melanogaster." Diss., [S.l.] : [s.n.], 2006. http://edoc.ub.uni-muenchen.de/archive/00006131.

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11

Burnett, W. J. "Population structure and species delimitation of Zoanthidea." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636184.

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Zoanthidea (Cnidaria, Anthozoa, Hexacorallia) are common on tropical rocky shores and coral reefs. Large numbers of nominate species exist and many are difficult to identify. I used a genetic approach to examine population structure and taxonomy of zoanthids from the Great Barrier Reef and Torres Strait regions of Australia. Genetic population structure was investigated over two different spatial scales, using allozyme electrophoresis at seven polymorphic loci. I collected <I>Palythoa caesia</I> samples from 20 reefs spread over 1800 km. Results show that genetic differentiation among reefs is

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12

Hughes, Mark. "Population structure and speciation in Begonia L." Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/6194/.

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In order to examine population structure (micro-evolution) in Begonia and its congruence to higher patterns of diversity (macro-evolution), nuclear microsatellite markers have been isolated and applied to two Begonia species, B. socotrana and B. sutherlandii. Begonia socotrana is endemic to the Haggeher Mountains of the island of Socotra in the Indian Ocean, where it has a total range of less than 10 x 15 km. Population surveys have highlighted the need for its conservation status to be reassessed, and it is proposed to reduce its status from 'endangered' to 'least concern'. Population genetic

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13

Purves, Drew William. "Local spatial structure and plant population dynamics." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251813.

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14

Barker, Margaret. "Population structure of the Bacillus cereus group." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/2145.

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The Bacillus cereus group of bacteria comprises B. anthracis, B. cereus, B. mycoides, B. pseudomycoides, B. thuringiensis and B. weihenstephanensis. Species status has been allocated to these taxa largely according to pathogenic properties. B. anthracis is the causative agent of anthrax in ungulates and humans. B. thuringiensis is primarily an insect pathogen and B. cereus is associated with food poisoning and occasionally soft tissue infections in humans. One hundred and forty-six strains of the B. cereus group were examined by multilocus sequence typing (MLST) in which partial sequences for

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15

Olson, Ewan Sinclair. "On the population structure of Mycobacterium tuberculosis." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265638.

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The thesis is based on the results of analysis of a collection of Scottish isolates by pulsed- field gel electrophoresis and also by IS<I>6110</I> Southern blotting. It also contains a review of the literature on <I>Mycobacterium tuberculosis</I> complex with an emphasis on strain typing and of the literature on population structures of bacteria. Based on the results and the literature review the following conclusions are drawn: 1. The population structure of Scottish isolates of the species <I>Mycobacterium tuberculosis</I> is clonal. 2. The genetic diversity of the Scottish isolates is so li

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16

Karlsson, Anton. "Population Models with Age and Space Structure." Thesis, Linköpings universitet, Matematik och tillämpad matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-134926.

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In this thesis, basic concepts of populational models are studied from a theoretical point of view, especially the long term behaviours. All models are at least time dependent with additional age structure, spatial structure. The last model which is an extension of the von Foerster equation, is dependent on all o f these structures and have a long-term solution for large values of time. Modeling population is a frequent subject in modern biology. It is hard to create a model that appears as realistic as possible. First one might consider that a population size is governed by the current size o

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17

Luna, Hernandez Angela. "Multivariate structure preserving estimation for population compositions." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/404689/.

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This document introduces a new Structure Preserving Estimator for Small Area compositions, using data from a proxy and a sample compositions. The proposed estimator, the Multivariate Structure Preserving Estimator (MSPREE), extends the two main SPREE-type estimators: the SPREE and the GSPREE. The additional flexibility of the MSPREE may lead to estimates with less MSE than its predecessors. An extension of the MSPREE including cell specific random effects, the Mixed MSPREE (MMSPREE), is also presented, in an attempt to further reduce the size of the bias when the associated sample size allows

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18

Giemza, Joanna. "Fine-scale genetic population structure in France." Thesis, Nantes, 2019. http://www.theses.fr/2019NANT1007/document.

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La structure génétique à fine échelle des populations humaines est intéressante pour deux raisons principales : 1) elle reflète des événements historiques et démographiques, 2) elle informe la recherche sur les études d’association de maladies. Cette thèse a pour objectif de procéder à une analyse approfondie de la structure génétique de la population de France métropolitaine dans un premier temps, en de façon plus détaillée de la population du nord-ouest de la France, et de mettre en lumière les événements historiques, démographiques et culturels qui l’ont façonnés, en tirant parti de trois j

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19

Hobbs, Geoffrey I. "Population genetic structure of a recovering otter (Lutra lutra) population in the UK." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54957/.

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The aim of this study was to identify the genetic structure of the expanding UK otter population. To do this I undertook detailed analysis of methodologies from the emerging field of landscape genetics. I compared the Bayesian Clustering methodologies, culminating in recommendations on how to interpret the results of the available software. Further to this I devised a novel progressive partitioning method, incorporating GIS (geographical information systems) to allow the clustering results of the different software packages to be compared and combined, producing a more robust interpretation of

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20

Nava, Imelda L. "Porichthys notatus bioluminescence capability, population structure, and systematics /." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1997749611&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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21

Chen, Hong. "Population structure and species description of aquatic Sphingomonadaceae." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-139494.

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22

Johnson, Mollie. "Population Structure of Limenitis Butterflies in Hickman, Kentucky." TopSCHOLAR®, 2008. http://digitalcommons.wku.edu/theses/368.

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Two species of Limenitis butterflies occur along the Mississippi River at Hickman, Kentucky: the viceroy, L. archippus, and the red-spotted purple, L. arthemis astyanax. Limenitis archippus occurs at a frequency that is 10-30 times more abundant than its congener, L. arthemis astyanax. Interspecific matings between L. archippus and L. arthemis astyanax are very rare in the wild and give rise to a hybrid form Limenitis archippus X L. arthemis astyanax form rubidus. Only 7 heterospecific pairings between the parental species and 72 "rubidus" individuals have been documented in the wild in all of

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23

Kyle, Christopher J. "Molecular population genetic structure of northeastern Pacific Littorina." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ27518.pdf.

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24

Idid, Mohammed Rizman. "Phylogenetics and population structure of Lake Malawi cichlids." Thesis, University of Hull, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418795.

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25

Bolt, Frances. "The population structure of the Corynebacterium diphtheriae group." Thesis, University of Warwick, 2009. http://wrap.warwick.ac.uk/1759/.

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A multi-locus sequence typing scheme was designed for the Corynebacterium diphtheriae group comprising C. diphtheriae, C. ulcerans and C. pseudotuberculosis. Five MLST genes (atpA, dnaE, fusA, odhA and rpoB) were analysed to resolve the inter-species relationships of the three organisms. No alleles were shared between the species and MLSA analysis indicated that they represent distinct populations with no evidence of recombination between the organisms. One hundred and fifty four C. diphtheriae isolates were analysed by MLST using the same five loci and two additional genes (dnaK and leuA). Th

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26

Cheshire, J. A. "Population structure and the spatial analysis of surnames." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1324522/.

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Geographers have largely overlooked surnames (family names), and their geographic concentrations, as a valuable source of data to indicate the spatial structure of populations. This thesis seeks to provide a substantive contribution to the geographical literature by demonstrating how quantitative spatial analysis of surname data can be used as an aid to understanding population structure at a range of scales from the regional to the continental. The primary purpose of this research is not to develop detailed case studies or to investigate specific examples of population characteristics conside

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27

Smith, Olutolani. "Population genetics and structure of the Sumatran tiger." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/11756.

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The two key determinants of population persistence in fragmented landscapes are population size and connectivity. Populations with high levels of genetic variation and large population size are expected to have a lower risk of extinction. Similarly, populations with high rates of connectivity are expected to persist long-term. For many elusive landscape species it is difficult to obtain direct estimates of these parameters, but genetic sampling can offer powerful indirect assessments. Whilst these techniques have been applied to the study of many wide-ranging carnivores, this study represents

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28

Rimal, Suraj. "POPULATION STRUCTURE INFERENCE USING PCA AND CLUSTERING ALGORITHMS." OpenSIUC, 2021. https://opensiuc.lib.siu.edu/theses/2860.

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Genotype data, consisting large numbers of markers, is used as demographic and association studies to determine genes related to specific traits or diseases. Handling of these datasets usually takes a significant amount of time in its application of population structure inference. Therefore, we suggested applying PCA on genotyped data and then clustering algorithms to specify the individuals to their particular subpopulations. We collected both real and simulated datasets in this study. We studied PCA and selected significant features, then applied five different clustering techniques to obtai

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29

Penington, Sarah. "Branching processes with spatial structure in population models." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:361e5c58-e6dd-47a0-9a52-303e897547e8.

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We consider three different settings for branching processes with spatial structure which appear in population models. Firstly, we consider the effect of adding a competitive interaction between nearby individuals in a branching Brownian motion. Each individual has a mass which decays when other individuals are nearby. We study the front location: the location at which the local mass density drops to o(1). We show that there are arbitrarily large times t at which the front location is order of t^(1/3) behind the maximum displacement of a particle from the origin. Secondly, we study the strengt

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30

Monclova-Santana, Cecilia. "Population Structure of Uromyces appendiculatus in North Dakota." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29519.

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North Dakota is the lead producing state of common bean in the USA, accounting for 43% of national production. Bean rust is caused by the autoecious, macrocyclic fungus Uromyces appendiculatus (Pers.:Pers.). All pathogen spores stages have been observed in North Dakota, but it is unclear how frequently sexual reproduction occurs. Traditionally, genetic resistance is the preferred management method. Sixty-seven percent of the 119 U. appendiculatus single pustule isolates collected in 2015 and 2016 were classified phenotypically as race 20-3. Virulence phenotypes of race 20-3 isolates ranged fro

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31

Hammen, Jeremy J. L. "Genetic structure of Wisconsin's naturally recruiting walleye population /." Link to full-text, 2009. http://epapers.uwsp.edu/thesis/2009/Hammen.pdf.

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Thesis (M.S.)--University of Wisconsin--Stevens Point, 2009.<br>Submitted in partial fulfillment of the requirements of the degree Master of Science in Natural Resources (Fisheries), College of Natural Resources.) Includes bibliographical references (leaves 52-63).

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32

Hubbard, Amelia R. "AN EXAMINATION OF POPULATION HISTORY, POPULATION STRUCTURE, AND BIOLOGICAL DISTANCE AMONG REGIONAL POPULATIONS OF THE KENYAN COAST USING GENETIC AND DENTAL DATA." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337195794.

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33

Robinson, Emma Claire. "Characterising population variability in brain structure through models of whole-brain structural connectivity." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5875.

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Models of whole-brain connectivity are valuable for understanding neurological function. This thesis seeks to develop an optimal framework for extracting models of whole-brain connectivity from clinically acquired diffusion data. We propose new approaches for studying these models. The aim is to develop techniques which can take models of brain connectivity and use them to identify biomarkers or phenotypes of disease. The models of connectivity are extracted using a standard probabilistic tractography algorithm, modified to assess the structural integrity of tracts, through estimates of white

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34

Melling, T. M. "The ecology and population structure of a butterfly cline." Thesis, University of Newcastle upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377453.

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35

Gosney, Louise Mary. "Phylogeography and population structure of carabid beetle Pterostichus melanarius." Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247110.

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36

Thomas, Scott. "Genetic Structure Due to Variation in Breeding Time in a Salamander Population." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1386767741.

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37

Weir, D. A. "The population ecology and clonal structure of two grasses." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353346.

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38

Renwick, Juanita. "Population structure and genetic diversity of Southeast Queensland populations of the Wallum Froglet, Crinia Tinnula (Tschudi)." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16181/1/Juanita_Renwick_Thesis.pdf.

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Genetic diversity is a fundamental attribute that contributes to a species evolutionary survival. In recent times, conservation managers have recognized the need to preserve genetic diversity of declining species, and have also acknowledged the utility of genetic markers for describing genetic and ecological relationships within and among populations. Information obtained from genetic studies can be used in conjunction with information on population demography, land use patterns and habitat distribution to develop effective management strategies for the conservation of species in decline. T

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Renwick, Juanita. "Population structure and genetic diversity of Southeast Queensland populations of the Wallum Froglet, Crinia Tinnula (Tschudi)." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16181/.

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Genetic diversity is a fundamental attribute that contributes to a species evolutionary survival. In recent times, conservation managers have recognized the need to preserve genetic diversity of declining species, and have also acknowledged the utility of genetic markers for describing genetic and ecological relationships within and among populations. Information obtained from genetic studies can be used in conjunction with information on population demography, land use patterns and habitat distribution to develop effective management strategies for the conservation of species in decline. T

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40

Aldrich, Benjamin T. "Population genetics and colony structure of two Zootermopsis subspecies /." Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.

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41

Choopun, Nipa. "The population structure of Vibrio cholerae in Chesapeake Bay." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1686.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2004.<br>Thesis research directed by: Marine-Estuarine-Environmental Sciences. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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42

Neuditschko, Markus. "A whole-genome population structure analysis within cattle breeds." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-133991.

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43

Strand, Tanja. "European Black Grouse : MHC Genetic Diversity and Population Structure." Doctoral thesis, Uppsala universitet, Populationsbiologi och naturvårdsbiologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160042.

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Black grouse Tetrao tetrix is a bird species composed of large, continuous as well as severely reduced and fragmented populations, making it an optimal species to investigate how genetic diversity is affected by habitat fragmentation. I have focused on genetic diversity in the Major Histocompatibility Complex (MHC) to measure the ability of the black grouse to respond to environmental changes. I partly characterized MHC class II in black grouse and found striking similarities with chicken MHC class II. I demonstrated that black grouse possess a similar compact MHC as chicken with few MHC class

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44

Searle, Laura. "Population structure and siderophore production in commensal Escherichia coli." Thesis, University of East Anglia, 2015. https://ueaeprints.uea.ac.uk/60797/.

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The factors involved in the diversity, transition and persistence of commensal Escherichia coli, both between and within hosts, are not fully understood. The aim of this project was to develop and use comparative approaches to investigate traits associated with colonisation of the gut by taking advantage of two collections of natural isolates of E. coli, the ECOR (host-associated) and GMB (plant-associated) collections. A new method for uniquely tagging and monitoring individual E. coli strains was developed to facilitate the assessment of large numbers of strains in complex environments, such

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45

Wang, Yean. "Molecular polymorphisms for phylogeny, pedigree and population structure studies." University of Sydney, 2007. http://hdl.handle.net/2123/1541.

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Doctor of Philosophy<br>A number of types of molecular polymorphisms can be used for studying genetic relationship and evolutionary history. Microsatellites are hypervariable and can be very useful tools to determine population structure, distinguish sibling species, as well as verifying parental relationships and pedigrees. However, while microsatellite polymorphisms are useful for solving relationships between populations within a species, relations among species or genera will probably be obscured due to a high degree of homoplasy —identity arising from evolutionary convergence not by desce

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46

Parks, Wesley Ryan. "Structure of the Eastern U.S. Wheat Powdery Mildew Population." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-01032008-214715/.

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In the eastern U. S. and other wheat growing areas of the world, powdery mildew is a major constraint to the production of wheat. Currently, the most effective and economical means of control is to use resistant cultivars. Unfortunately, the diversity of the pathogen population enables the pathogen to overcome new resistance genes, often within several seasons of commercial deployment. Surveys to determine the virulence of the population to a set of resistance genes have been performed in many areas of the world. Often, differential frequencies of virulence at varying geographic areas are exte

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47

Carlsson, Jens. "Population genetic structure of brown trout in boreal ecosystems /." Umeå : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2000. http://epsilon.slu.se/avh/2000/91-576-5884-6.pdf.

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48

Hume, Jennifer C. C. "Transmission studies and population structure in human malaria parasites." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409801.

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49

Brierley, Andrew Stuart. "Aspects of genetic diversity and population structure of squid." Thesis, Bangor University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316589.

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50

Jan, Camille. "Population structure of swarming bats in relation to dispersal." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540207.

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