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 37 for “"Environmental heterogeneity"”.
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The Resource Environment and Microbial Associations Mediate Adaptation to Environmental Heterogeneity in Drosophila Melanogaster
Identifying the putative environmental factors that influence the adaptive outcomes ofpopulations as they respond to heterogeneity remains a major focus of evolutionary biology. The ability to observe the genomic and phenotypic evolution of populations over rapid timescales has enabled a deeper …
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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
… of endogenous (e.g., seed dispersal) and environmental factors on spatial patterns of plants and genetic relatedness distribution. I combine genetic and ecological data in a novel and comprehensive Bayesian model to estimate parentage to more fully characterize the contribution of pollen …
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The importance of hydrologic refugia for the diversity of the Cape Flora
… narrow-range endemics (WD-NREs) and explore the environmental correlates of these distributions. I make use of Quarter degree square grid cells as a measuring unit, which are larger (~20 km across), than the scale at which microrefugia typically occur, however, the broad environmental …
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A seascape genetics approach to exploring the phylogeographic response of marine fishes to late Quaternary climate change
… as shallow-water marine fishes respond to environmental heterogeneity over space and climatological shifts over time. [TRUNCATED]
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Aquatic Community Interaction Diversity and Mosquito Larvae
… size, invertebrate diversity, and spatial heterogeneity.My dissertation research focuses on the larval stages of mosquitoes. The mainquestions of my research include: 1. What are the important interactions of co-inhabitinginvertebrates including predators and competitors, with mosquito …
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
… understood. This dissertation examines how environmental heterogeneity and succession influence the distribution, expression, and adaptive value of resistance and tolerance of goldenrod (Solidago altissima). Within replicate early- and late-successional fields, I quantified the spatial …
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Predicting phytoplankton community dynamics: understanding water quality responses to global change
… in ecology is understanding interactions between environmental heterogeneity and ecological community structure, both of which are currently undergoing unprecedented alterations due to global change. In particular, many freshwater phytoplankton communities are experiencing multiple global change …
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Interactions, Heterogeneity, and the Determinants of Multispecies Coexistence
… in complex, multispecies communities with environmental heterogeneity, which is of paramount importance in the changing world that we inhabit. In this thesis, I combine the most recent advances in ecological theory with thorough empirical data to explore how different sources of …
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Integrating Above and Belowground Components of Biodiversity across Spatial Scales: The Role of Host Plants in the Distribution of Arbuscular Mycorrhizal Fungi
… preference for certain host plant species; how environmental heterogeneity and energy availability affect communities; and the relative influence of niche and neutral processes. This thesis describes experiments which profile AM fungal communities and environmental properties of their habitat at …
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The Direct and Indirect Effects of Insectivory by Birds in Two Neotropical Forests
… are inappropriate for tropical forests, where environmental heterogeneity is great.
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Responses of Boom-Forming Phytoplankton Populations to Changes in Reservoir Chemistry and Physics
… to dam) and vertical (surface to sediments) environmental heterogeneity, which plays a large role in determining phytoplankton population dynamics. In this thesis, I explore how three bloom-forming phytoplankton taxa, the dinoflagellates Peridinium and Gymnodinium, and the cyanobacterium …
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Mechanisms determining the coexistence of open- and closed-canopy biomes
… and water availability than closed environments. Environmental heterogeneity could select for divergent floristic assemblages and adaptive traits, from which emergent differences in resource availability and fire incidence contribute to excluding species from the alternate habitat. In this thesis, …
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Phenotypic plasticity and population differentiation in Suaeda maritima on a salt marsh
… bank, upper low marsh, and low marsh. Field environmental heterogeneity was assessed by taking measurements of sediment salinity, water content, organic content, redox potential, elevation in the tidal frame and annual number of tidal inundations. They demonstrated that different Suaeda …
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Genome-Scale Genetics: Lessons from Founder Populations
… in genetic mapping due to reduced genetic and environmental heterogeneity are offset by the challenges posed by these populations for traditional association methods. Population isolates often contain large amounts of direct and cryptic relatedness that confound baseline assumptions of …
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Interactions among tree species and pathogen-suppressive bacteria in tropical forest soils
… of multiple soil functional groups and environmental heterogeneity in microbe-microbe and plant-microbe interactions. In my dissertation, I investigate antibiotic-producing soil bacteria (genus: Streptomyces) in tropical forest soils. I focus on biotic and abiotic characteristics that …
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Local adaptation to parasites and selection on major histocompatibility genes in ecologically divergent populations of three-spine stickleback (Gasterosteus aculeatus)
… selection, and imply that gene flow and environmental heterogeneity can be important for maintaining MHC diversity.
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Environmental and landscape determinants of population genetic structure and diversity of the great fruit-eating bat, Artibeus lituratus, in Atlantic forest remnants in South America
… natural populations, and population responses to environmental change, which in turn can have important consequences for the maintenance of species diversity. For my dissertation, I studied genetic variation of a seed-dispersing bat, Artibeus lituratus (Chiroptera: Phyllostomidae), in a …
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Environmental granularity, rivers and climate history as shaping factors for species' distribution and diversity patterns
… are composed by those places in which the environmental conditions are suitable for the species to survive and maintain populations; where the interactions with other species are adequate; that have been accessible given species' dispersal capabilities. Biodiversity patterns have been …
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