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 247 for “"genetic structure"”.
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Genetic Structure of Yonahlossee Salamander Populations.
… to be rare and local throughout their range. Genetic differentiation among populations of any species is usually attributable to long-standing, extrinsic barriers to gene flow. Because of their disjunct population structure and some observed morphological variation, genetic differentiation …
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Macrogeographic Genetic Structure in Acanthephyra curtirostris (Oplophoridae)
… species long assumed to be widespread and genetically undifferentiated across their species range. Recently, however, data from sensitive DNA-based molecular markers has shown that many cryptic species exist in the sea and that marine zooplankton species may be more genetically structured …
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An Assessment of Population Genetic Structure in Guillemots (Cepphus)
… how evolutionary forces shape population genetic structure is a principal goal of evolutionary geneticists. Guillemots (Aves: Charadriiformes: Alcidae: Cepphus) provide useful systems for investigating population genetic differentiation in a genus with a wide geographic range that …
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Fine-scale genetic structure and parentage in Urocitellus beldingi
… analyzed via PCR to elucidate the fine scale genetic structure, offering insight into population health, stochastic events, and dispersal. Two populations were identified, corresponding to the elevation differences between the sites (F<sub>ST</sub> = 0.054605 pm) of 8.66. These populations …
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Population Genetic Structure of Unionid Mussels Across Multiple Gulf Drainages
Understanding patterns of genetic differentiation within and across wildlife populations is a key component to parsing the demographic and ecological processes that govern the spatial structure and evolutionary trends of a given species. As molecular and computational techniques continue to …
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Genetic structure and inversions in the Lake Malawi cichlid radiation
… synthesis unified evolutionary biology and genetics, fundamentally reorienting life sciences. Recent advances in DNA sequencing have enabled evolutionary research to consider entire genomes, an unprecedented opportunity to study the genetic basis of adaptation and speciation. This thesis …
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Genetic Structure and Demographic Analysis of Key deer (Odocoileus virginianus clavium)
Recent improvements in genetic analyses have paved the way in using molecular data to answer questions regarding evolutionary history, genetic structure, and demography. Key deer are a federally endangered subspecies assumed to be genetically unique (based on one allozyme study), homogeneous, and …
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Origins and Genetic Structure of the Garifuna Population of Central America
This study uses molecular markers to examine the genetic impact of forced human migrations to the Americas during the time of the trans-Atlantic slave trade. The genesis of admixed populations was the result of this African migration and relocation, and this study focuses on the Garifuna peoples of …
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Population genetic structure of Antarctic springtails (Collembola) and New Zealand damselflies (Odonata)
… ability to analyze differences in the molecular structure of enzymes and DNA sequences has provided an extremely sensitive tool for investigating gene flow within and among populations, a key facet of the genetic divergence required for speciation to occur. Using such techniques, we are now able …
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Biology and peculiarities of the population-genetic structure of Lithuanian Cephalaspidomorphs (Cephalaspidomorphi) /
… rivers in Lithuania for the first time. A phylogenetic analysis based on mtDNA markers revealed that L. fluviatilis and L. planeri belong to the same evolutionary lineage. Additionally, the findings suggest that the Baltic Sea Lampetra spp. populations might experience the gene flow between two …
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Spatial Genetic Structure in the Mount Vernon Prairie Population of Rudbeckia Hirta
It has frequently been predicted that genetic variation in plant populations will be structured in space as a result of isolation by distance, but this prediction has seldom been tested. This study quantified the magnitude and scale of spatial genetic structure in a natural population of the …
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GENETIC STRUCTURE OF PINUS STROBUS L BASED ON FOLIAR ISOZYMES FROM 27 PROVENANCES
<p>Genetic structure of eastern white pine (Pinus strobus L.) was studied with foliar isozymes from 27 provenances by starch gel electrophoresis. Twenty-one loci, five fixed, coding for 12 enzyme systems, including three invariants, were used for this study. Indirect evidence for genetic control of …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
Stream network structure constrains population processes of freshwater organisms, with individual, population and community level consequences. This consistent structure provides a framework in which examination of life-history influences on population genetic structure may provide general insight. …
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Scale dependent genetic structure of Idaho Giant salamanders (Dicamptodon aterrimus) in stream networks
Stream network structure constrains population processes of freshwater organisms, with individual, population and community level consequences. This consistent structure provides a framework in which examination of life-history influences on population genetic structure may provide general insight. …
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Genetic structure and colonisation history of European and UK population of Gammarus pulex
The structure of populations has been studied for many years and there have been three main factors that have been suggested as the cause for present-day distributions of species, those being environment, biology and history. With the use of molecular data and advanced phylogeographic approaches it …
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Genetic Structure of Amblyomma Cajennense (Acari: Ixodidae) Populations Based on Mitochondrial Gene Sequences
… distinct populations. The strong phylogenetic structure indicates that A. cajennense may actually be a species complex in need of thorough morphological reassessment.
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Population Genetic Structure of the Temperate Scleractinian Coral, Oculina Arbuscula, in Coastal Georgia
Dispersal of marine organisms has generally been assumed to be demographically open with planktonic larvae exploiting ocean currents to travel long distances. However, recent studies report evidence of local larval recruitment. In this study, I hypothesized that populations of the temperate coral, …
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Genetic structure of Pseudoroegneria spicata in the Northern Palouse Prairie and Channeled Scablands
<p>Establishing genetically diverse communities that can adapt to dynamic selective pressures is crucial in ecological restoration. However, the genetic structure of native plant species used for restoration is often poorly understood. Pseudoroegneria spicata, is a keystone species of the Inland …
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Species diversity, genetic structure and variability of begomovirus populations infecting tomatoes in Ecuador
O gênero Begomovirus (família Geminiviridae) inclui vírus com genoma de DNA de fita simples, que infectam espécies de plantas dicotiledôneas e são transmitidas pela moscabranca Bemisia tabaci. Doenças causadas por begomovírus são economicamente importantes por causarem grandes perdas em culturas …
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