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.
Results
Showing 1 to 20 of 75 for “"geographic distance"”.
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The role of cultural divergence in reproductive isolation in a tropical bird, the rufous-collared sparrow (Zonotrichia capensis)
… be driving the pattern. Apart from culture, a geographic barrier (the Andean ridge), elevation, and geographic distance were potential mechanisms of population divergence that I considered. All sites exhibited localized dialects, except for two closest neighboring populations. Populations …
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Diet Breadth Evolution and Diversification of a Generalist Insect Herbivore
… such as host plant use, diet breadth, and geographic isolation can influence the diversification of herbivores. I performed genetic analyses of fall webworm using double-digest RADseq to test the relative importance of diet breadth, host plant use, and geographic distance on the genetic …
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System for the online assessment of distributed projects
… funded by CNII and analyze the effects of geographic distance, project structure, and communication on performance. This thesis will discuss the development of the online data collection system as well as its maintenance and ongoing improvement.
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Rarity, cause or consequence: comparative landscape genomics of six lichenized fungi with contrasting range sizes, life histories, and morphologies
… species generally exhibited greater genomic distances between multi-locus genotypes with less admixture between populations than widespread species. Mantel tests identified isolation-by- distance only in range-restricted species highlighting the influence of geographic distance on genetic …
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SPATIAL VARIABILITY IN SPECIES COMPOSITION IN NEOTROPICAL MONTANE TREE COMMUNITIES
… correlated with explanatory variables such as geographic distance, environmental variables as aspect, slope, potential solar radiation (PSR), and carbon&ndash6;nitrogen soil content to examine the variation explained by environmental variation in addition to elevation (temperature). Results …
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Historical and Geographic Context for the Evolution of Climate Niche Breadth in Temperate Plants
… that assess the relative roles of historical, geographic and population processes that contribute to climate niche breadth in temperate plants. The first project evaluates the predictive power of a classical hypothesis. If gene flow slows divergent adaptation, then range fragmentation should …
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Geographic and Ontogenetic Variation of Venom in the Rattlesnakes Crotalus oreganus oreganus and Crotalus o. helleri
… helleri) rattlesnakes, with special emphasis on geographic variation across the species’ California range. In the first of three empirical studies, I used reversed-phase liquid chromatography and mass spectrometry to examine the venome of four C. o. helleri populations. Substantial geographic …
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Historical Land Fragmentation and its Effects on Genetic Diversity and Parasitism of Island Populations of Podarcis erhardii (Lacertidae, Reptilia)
… and older islands have higher mite loads. Geographic distance was unrelated to genetic divergence. Tick prevalence was significantly associated with past grazing practices. This study provides a unique opportunity to disentangle factors that may influence the retention of genetic diversity …
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Exploring the Social Lives of Cylinder Seals in Late Cypriot Society
… of object biography, the ideological potency of geographic distance, and object inalienability, to examine how these objects were recontextualised and reinterpreted within their new Cypriot cultural context. The diachronic analysis of the cylinder seals found in different types of sites across …
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GPS based localized routing algorithms for wireless networks.
… based routing algorithms: the constant metric GEographic DIstance Routing (GEDIR) algorithm and several power-aware algorithms: power efficient, cost efficient and power-cost efficient routing algorithms. 2-hop, flooding and multiple-path variants are also suggested for the algorithms with …
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Allozyme Diversity and Hybridization in Castanea Pumila (Section Balanocastanon, Fagaceae)
… intergradation. One explanation for the observed geographic variability is hybridization between two incompletely isolated species. To explore this possibility, the geographic distribution of allozyme variation was examined for patterns indicative of a hybrid zone. Only one of six loci assayed was …
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TRAVEL TIME AND THE LIABILITY OF DISTANCE
Despite suggestions that the importance of geographic distance between interacting organizations is decreasing due to better communications technologies, this thesis shows that such separation remains important. Measures of geographic distance are commonly used as proxies for the impact of physical …
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The Population Genetics Of The Wood Frog, Rana Sylvatica, Across Its Geographic Range
… significant genetic differentiation across the geographic range of Rana sylvatica that increased with geographic distance. In addition three likely glacial refugia, Alaska, New York and the southern Appalachians, were identified.</p> <p>A subset of the populations used in the geographic range …
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The Genetic Consequences of Disjunction in Campanula Rotundifolia (Angiospermae: Campanulaceae)
… with an estimated Fst of 0.173. Nei's genetic distance between populations is only weakly correlated with geographic distance (r + 0.145), and Fst estimates for local clusters of populations are as high as the total Fst, indicating that differentiation is mostly on a local scale. The median …
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Leadership in partially distributed teams
… subteam and at least two subteams that are geographically distributed and communicate primarily through electronic media. While PDTs share many characteristics with both traditionally collocated and fully distributed teams, they also have unique characteristics and issues. This dissertation …
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Biotic and Abiotic Drivers of Plant-Pollinator Interaction Rewiring
… Both variables also provide pathways for geographic distance to indirectly impact rewiring. Second, I use a multinomial logistic regression to show that pollinators prefer different flowers at different temperatures, even within a constant plant community. Third, I present an experimental …
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Genetic Variation Among Geographically Disparate Yellow Perch Broodstock Populations
… Estimates of genetic diversity, Φ ST and genetic distance were highest between Michigan and all other populations and lowest between New York and Ohio. Genetic differentiation among populations did not correlate with geographic distance. Overall, the patterns of variation exhibited by the captive …
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Genetic differentiation of the parasitoid, Cotesia congregata (Say), based on host-plant complex
… on the same host-plant were identical despite geographic distances between catalpa sites of up to 830 km and distances between tobacco sites of up to 294 km. Results indicate genetic differentiation of subpopulations of C. congregata based on host-plant complex and not geographic distance, and …
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Emerging adults’ sibling relationships and inter-sibling communication : general communication patterns and chronemic expectation violation in a text-based interaction
… related to general communication patterns and geographic distance. Under the frameworks of Expectancy Violation Theory and Social Information Processing Theory, this study further explored the association between the three dimensions of sibling relationships and perceived chronemic expectation …
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