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 37 for “"geographic distributions"”.
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Geographic distributions and vertebrate host specificity of genetic lineages of Borrelia burgdorferi
Characterizing the diversity of genes associated with virulence and transmission of a pathogen across the pathogen’s distribution can inform our understanding of host infection risk. Borrelia burgdorferi is a vector-borne bacterium that causes Lyme disease in humans and is common in the United …
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Modeling species geographic distributions in aquatic ecosystems using a density-based clustering algorithm
… which aims to reconstruct and predict the geographic range of free-living and symbiotic organisms in terrestrial and aquatic ecosystems. More recently, distributional ecology has been used to map disease transmission risk. The implementation of distributional ecology for disease …
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The effect of the study region on GIS models of species geographic distributions and estimates of niche evolution; preliminary tests with montane rodents (genus Nephelomys) in Venezuela
… techniques exist to model a species' potential geographic distribution in a Geographic Information Systems (GIS) framework. These models compare the environmental conditions of localities of a species' occurrence versus those of the overall study region. In addition to uses in areas such as …
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Ecological Niches, Species Distributions, And Biogeographic Processes In Rodents On Neotropical Sky Islands
… understand the processes governing species distributions and associated evolutionary divergence in rodents inhabiting mesic conditions in the Neotropics. Focusing on a widespread rodent from northern South America (Heteromys anomalus), in the first chapter I proposed and tested a …
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Bats of the Monongahela National Forest
… declines in recent years. Insight into their distributions and habitat associations, as well as understanding population trends, will aid in conservation efforts. In this study, the geographic distributions of the 10 species of bats found in the Monongahela National Forest of West Virginia …
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The Ecology of Sexual and Apomictic Reproduction in Antennaria Parlinii Gaertner (Apomixis, Plant Breeding Systems, Evolution)
Differences in habitat and geographic distributions of sexually and asexually reproducing species are often attributed to differences in relative colonizing and competitive abilities. In this thesis, fitness components that influence colonizing and competitive ability are compared in an herbaceous …
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Mapping workplace and organizational change
… to visualize the new physical pattern and geographic distributions of global organizations to form a conceptual understanding of the complexities in the global economic activities.
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Relation of crystalline style function to food availability and environmental conditions in South African mussels
… factors determine the different intertidal and geographic distributions of these mytilids. Work in the kelp beds has shown that the energy budgets of mussels depends on the utilisation of particulate material from both kelp and phytoplankton production, which have very different structural …
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Application of high-throughput methods to reconstruct the evolutionary history of amherstieae by using the fossil pollen record of Striatopollis catatumbus and extant geographical records of the tribe
… how climate has played a role in the modern geographic distributions of tropical plants, especially the legume tribe Amherstieae. First, superresolution confocal microscopy was used to increase the morphological resolution of modern and fossil pollen grains to detect diagnostic features of …
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A unified population model of Calanus finmarchicus and C. helgolandicus in the North Atlantic
… been critically reviewed. Further, the relative geographic distributions of both species have never been related to inter-species differences in biology or ecology. This thesis has two key elements. First, we critically review and synthesize existing knowledge of inter-species differences between …
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Intraspecific plant polyploidy effects on goldenrod insect herbivores
… variation exists within and among population geographic distributions of diploid (2N), tetraploid (4N), and hexaploid (6N) races of S. altissima and assesses whether host use by seven taxonomically diverse herbivorous insect species is non-random with respect to ploidy level across this …
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Taxonomy, Diversity, and Distribution Patterns of Portunid Crab Megalopae in the Northern Gulf of Mexico During Fall of 2003
… multi-dimensional scaling (NMDS) depicted geographic distributions and community structure during the study period. Mapping of NMDS coordinates illustrated distribution patterns for four community types of portunid megalopae as mainly distinguished by the differences in relative abundances …
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Phylogenetics, biogeography, and climate niche variation of South Pacific and Hawaiian Psychotria
<p>Why do some species have broad geographic distributions, while other species are confined to a narrow distribution? Species age, ecological niche, or dispersal traits may help explain why some insular species are abundant and found on many islands, while others are rare and restricted to one …
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An Examination of Gene Flow Among Distinct Management Units of The Reddish Egret
… units (Western, Central, and Eastern) based on geographic distributions and the findings of Hill et al. (2012). We collected blood and feather samples from nestlings (n = 145) of eight sample sites (Baja California, Chiapas, Yucatan, Tamaulipas, Texas, Louisiana, Florida and the Bahamas). We …
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CROW - CultuRal co-evOlution of corvids: Winged omens of the times
… previous campaigns of corvid killing on species’ geographic distributions, while highlighting ancient positive human-corvid relationships lets us celebrate how these birds are and have always been part of our culture.<p></p>
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CROW - CultuRal co-evOlution of corvids: Winged omens of the times
… previous campaigns of corvid killing on species’ geographic distributions, while highlighting ancient positive human-corvid relationships lets us celebrate how these birds are and have always been part of our culture.<p></p>
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Analysis of clnical features of cryptococcosis and antifungal susceptibility of clinical isolates in Korea
… for C.gattii). Each subtypes shows different geographic distributions and antifungal susceptibility. We analyzed clinical features of cryptococcosis and antifungal susceptiblity of clinical isolates. METHODS: We analyzed retrospetively 43 cases of cryptococcosis diagnosed in Ajou University …
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A way to use GIS (incl. geomasking) to understand homelessness: a focus on the spatial characteristics of and around sleeping locations of the homeless in Cape Town City Bowl
… analysis, weather analysis, and obfuscation/geographic masking Results: (a) The daily individual sleeping locations of the homeless individuals and groups increase over time but their geographic distributions are similar or display insignificant/little variations. (b) Majority of these …
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Patterns and processes of speciation in North American chorus frogs (Pseudacris)
… for at least nine species and delineate their geographic distributions. In chapter 3, I test geological and climatic hypotheses proposed to drive speciation in North American flora and fauna. By estimating divergence times in the trilling chorus frogs and correlating these divergences with …
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Systematics of the Afrotropical Mystarini (Araneae : Thomisidae : Dietinae)
… identification keys to genera and species and geographic distributions for each species are provided.
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