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 18 of 18 for “"Spatial Genetic Structure"”.
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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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Response of Australian Boobooks (Ninox boobook) to threatening processes across urban, agricultural, and woodland ecosystems
… limitation of juvenile dispersal and impacts on spatial genetic structure; breeding site availability; and infection by the parasite Toxoplasma gondii. I also conducted a literature review on the use and regulation of ARs in Australia and published accounts of non-target impacts in order to …
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Ecological genetics of the moss Physcomitrella patens
Molecular genetic studies using the model bryophyte Physcomitrella patens have advanced the body of knowledge surrounding plant functional genetics and molecular biology, yet very little is known about the ecology and population genetics of this species. Although the bryophytes are the second …
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Molecular diversity of Primula apennina and phylogeny of Primula Subsection Euauricula
… Apennines (Italy). ISSR were used to detect the genetic diversity within and among six populations representative of the species distribution range. High levels of genetic diversity were revealed both at population (PPB = 75.92%, HS = 0.204, Hpop = 0.319) and at species level (PPB = 96.95%, HT = …
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The Role That Asexual Reproduction Plays in the Regeneration of Tropical Piper Shrubs: Habitat Differences and Genetic Consequences
… the ecological correlates and population genetic consequences of asexual reproductive success in five co-occurring Piper species using a combination of field experiments and molecular approaches. Working at the Barro Colorado Nature Monument (BCNM) Panama, I found that shade-tolerant …
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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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Effects of habitat degradation on the evolutionary dynamics of populations in a rainforest cycad (Gymnospermae)
… persistence, including effects on ecological and genetic processes beyond decreased demographic viability and the loss of genetic variation. Particularly interesting is the potential for evolutionary changes and adaptation to degraded habitats, that can affect population viability even in the …
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The effects of flooding disturbance on the distribution and behaviour of riparian arthropods along a lowland gravel river
… environmental factors influence the assemblage structure of mobile, riparian arthropods along spatially structured river banks of a rain-fed, lowland gravel river, the Common Meuse. As riverine ecosystems are basically non-equilibrium, dynamic ecosystems, mainly flow regimes and flood pulse …
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Faunal turnover between east and southern African terrestrial vertebrates: is Malawi the geographical break?
… centred on the investigation of phylogeographic structure within three forest associated bird species and two small mammal species, as well as two woodland associated bird species distributed across the Malawi Rift of Africa. The key objective was to investigate the extent to which geographically …
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Population genetic analyses of Ferula gr. communis and Ruta gr. corsica in the Tyrrhenian area
… these species is still scarce, especially at the genetic level. In this thesis the first assessment is reported of the genetic diversity and structure of the Corso-Sardinian endemic Ferula arrigonii (Apiaceae) and of Ruta corsica and R. lamarmorae (Rutaceae), endemic to Corsica and Sardinia, …
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A genetic perspective on leopard (Panthera pardus) conservation units across southern Africa
… should ideally synthesise a wide array of data – genetic, ecological, demographic – to identify the appropriate scales at which conservation actions can then be directed. Despite being the most widespread of all felids in Africa, and facing numerous threats across its range, it has been proposed …
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The effects of clonal reproduction on population demography, genetic structure, and mating pattern of <i>Dicentra canadensis</i>
… their parents, clonal reproduction can result in spatially aggregated ramets. Clustering of clones can reduce the frequency of pollen transfer between genets if pollinators tend to forage on nearby plants. In extreme cases, clustering of clones may prevent sexual reproduction, especially in plants …
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Influence of gene dispersal and environmental heterogeneity on spatial and genetic patterns of the understory herb Heliconia acuminata across a fragmented landscape in central Amazon, Brazil
Understanding how plants are spatially and genetically distributed in the environment can be a challenging task given the difficulty to characterize ecological processes, such as gene flow, and to disentangle the relative importance of multiple factors underlying the generation of distinct …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… notably terpenes. In Chapter 1, I explored the genetic structure in Eucalyptus globulus to understand how processes such as gene flow and genetic drift have shaped the genetic distribution of the species. Using microsatellite-derived genotypes of individuals covering the range of the species, I …
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A molecular analysis of the population structure, mating system and demography of Eucalyptus
… notably terpenes. In Chapter 1, I explored the genetic structure in Eucalyptus globulus to understand how processes such as gene flow and genetic drift have shaped the genetic distribution of the species. Using microsatellite-derived genotypes of individuals covering the range of the species, I …
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Estudio de las pautas de reproducción de Quercus ilex L. y Q. suber L. mediante marcadores moleculares
… obtaining experimental information regarding the genetic structure and pollen dispersal in holm and cork oaks, which can be used for the sustainable management of the dehesas. The regeneration of the dehesas has been genetically analyzed for the first time. Nuclear microsatellites (nSSR) have been …
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Comparative Population Genomics and Speciation of Snakes Across the North American Deserts
… This study reveals 1) substantial population structure in these snake groups, 2) climate explains the greatest amount of genetic divergence, and 3) that the CFB has likely been important in lineage formation and species diversification. Although these species groups broadly share population …