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 60 for “"community diversity"”.
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Phylometagenomics: a new framework for uncovering microbial community diversity
… biogeochemical processes. However, the genetic diversity and composition, as well as processes leading to the origin and diversification of these communities in space and time, are poorly understood. Character- ization of microbial communities using high-throughput sequencing of 16S tags shows …
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Community diversity influences selection on nutrient resorption in <em>Panicum virgatum</em>
1 PDF file (vi, 40 pages)
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Enhancing livelihood and community diversity through wetland- approach to living with the wetland
… is to explore the key factors influencing the community's well-being and to comprehend the intricate obstacles hindering spatial improvement. The research aims to investigate the spatial, social, and cultural dimensions of informal settlements, seeking to unravel the underlying causes and …
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A drinking water microbiome from source to tap: Community diversity, functionality, and microbial interaction
… is rather challenging owing to the complexity in community assembly, water matrices, physical structure, and chemical gradients from source to tap. Previous studies on drinking water microbiomes have primarily investigated “who are there” and “how do they change over time and across space” in …
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CONSEQUENCES OF ALTERED BURN REGIMES ON PLANT COMMUNITY DIVERSITY IN THE PINEYWOODS OF EAST TEXAS
… is vital to restoring forest health, species diversity, natural succession regimes, and reduction of some invasive species. Studies on the effect of fire frequencies on southern pine understory plant communities have revealed increased plant diversity and richness in response to fire, …
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Characterizing spatial and temporal trends in fish community diversity in the inland lakes of Isle Royale, MI, USA
… providing an opportunity to explore how fish diversity has natural shifted with minimal confounding effects. I analyzed fish assemblages of 23 lakes sampled in the 1920s, 1990s, and 2020s to 1) assess temporal shifts in species richness and composition 2) identify lakes and species …
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The Influence of Land Coverage and Soil Chemical Factors on Soil Bacterial Community Diversity and Structure in Cedartown, GA, USA
… to form the foundations of a new microbial community. A study of the bacterial community at a lead (Pb) contaminated study site in Cedartown, GA, found that the microbiome in the Pb contaminated soil had significantly lower species richness. But the soil had significantly greater diversity …
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Biotic Interaction of Invasive, Early-Succession Trees and Their Effects on Community Diversity: a Multi-Scale Study Using the Exotic Invasive Ailanthus altissima and the Native Robinia pseudoacacia in the Mid-Appalachian Forest of Eastern United States
… these two common species are important to community structure and canopy tree regeneration. To address the type and extent of interactions of these two species, a greenhouse experiment utilizing various species proportions, nutrient levels and seed sources was performed. In addition, a …
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Why it takes all kinds: diversity mechanisms and patterns in ecological communities
This work explores the effect of diversity of individuals on a community. The mechanisms generating diversity are explored, their effects on patterns of diversity are examined, and the impact of diversity on community properties (such as productivity and stability) is investigated. Three …
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Environmental Instability and the Structure of Temporary Pond Zooplankton Communities
… I. Ideas relating environmental instability and community diversity are reviewed. The distinction is made between evolutionary mechanisms, which require very long periods of time to operate, and ecological mechanisms, which operate over shorter spans of time. As part of the discussion of …
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The effect of chaotropic magnesium chloride on the growth of microbes
… sodium chloride (NaCl), on microbial growth and community composition, with the focus on MgCl₂. Solid (1.5% agar) and liquid media were supplemented with 1% yeast extract and different concentrations of MgCl₂ and NaCl, using samples from a salt marsh and agricultural soil (Colchester, UK). Viable …
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Identifying ecological differentiation in microbial communities across taxonomic scales
Microbial diversity, both genetic and phenotypic, is a product of evolutionary and ecological processes interacting at multiple levels of biological organization. High-throughput sequencing is providing a means to resolve the vast amount of genetic diversity in microbial assemblages. However, a …
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Appalachian Surface Mine Reforestation Techniques: Effects of Grading, Cultural Treatments and Species Selection
… reclamation reduced erosion and increased plant community diversity compared to smooth grading. Seeding only annual ryegrass (Lolium multiflorum) for erosion control, along with tree planting, increased plant community diversity and improved survival and growth of hybrid American chestnut …
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Integration of field-based analysis of plant community dynamics with quantitative analysis of landscape change in the Ray Roberts Lake area, 1987-1997
… effectiveness of integrating traditional plant community analyses with landscape ecological analyses based on remotely sensed data. A temporal analysis of plant community diversity was conducted for major plant communities of the Ray Roberts Lake area using transect monitoring data collected …
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Influence of plant species, location, and seasonality on rhizosphere bacterial communities in freshwater wetlands
… complexity of factors influencing soil microbial community structure, a greater knowledge of the relationship between rhizosphere microbial communities and different types of plant species will lead to a deeper understanding of plant-microbe interactions in wetlands. Thus, the purpose of my …
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The Effects of Rootstock Selection and Carbon-based Fertility Amendments on Apple Orchard Productivity and Soil Community Ecology
… nutrition, soil physiochemistry, and microbial community structure and activity, and 3) understand how rootstocks and fertilizers alter soil microbial communities. Applications of composts, integrated compost-calcium nitrate fertilizers, and biochar increased soil carbon, organic matter, cation …
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Automated Plant Morphological Assessment and Microbial Community Monitoring in Simulated Lunar Regolith
… Mizuna mustard growth while assessing microbial community diversity and functionality. To support this effort, a custom software pipeline utilizing an open-source library, PlantCV, was developed to automatically track plant leaf area and height via image analysis. Results indicated that amended …
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Recreational disturbance of a desert stream fish community: Detecting ecological effects of environmental impact
… altered population distributions and altered community structure as compared to pools generally lacking recreational activities. In addition, pools disturbed by recreation had lower abundance of desert sucker (Catostomus clarki) and lower community diversity than pools without recreation. Food …
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Do Academic Directors Promote Corporate Social Responsibility?
… directors have significant positive effect on community, diversity, environment and product components. At the same time, female academic directors have positive effect on diversity and employee relations but negative effect on environment. Finally, we observe that the effect of academics on …
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