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 67 for “"microbial community composition"”.
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The effects of invasive European Buckthorn (Rhamnus cathartica) on soil microbial community composition
… soil nitrogen and carbon by stimulating rapid decomposition of litter. Because decomposition and nitrogen cycling are microbial processes, I hypothesize that buckthorn invasion changes the community composition of soil microbes, and these changes should increase with increasing severity of …
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Switchgrass Yield, Nutrient Uptake, And Rhizosphere Microbial Community Composition As Affected By Cultivar And Soil Fertility
… crop management decisions may alter rhizosphere microbial populations and associated ecosystem functions such as carbon and N cycling, this research also incorporated next-generation sequencing technology to examine bacterial and fungal community composition as a function of switchgrass cultivar …
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Patterns in forest soil microbial community composition across a range of regional climates in Western Canada
Soil microbial communities can be characterized by community structure and function (community composition) across a spectrum of spatial scales, and variation in soil microbial composition has been associated with a number of environmental gradients. This study investigates the structure and …
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Effect of invasive phragmites australis and its control on microbial community composition in a freshwater wetland
<p>Wetlands support great species diversity and perform important ecosystem services like carbon and nutrient cycling, largely facilitated by microorganisms. Invasive plants, like Phragmites australis, reduce biodiversity and alter ecosystem services. I hypothesized that changes in soil bacterial …
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THE INFLUENCE OF THE INVASIVE CHINESE TALLOW (TRIADICA SEBIFERA) LEAF LITTER ON AQUATIC CHEMISTRY AND MICROBIAL COMMUNITY COMPOSITION
… Chinese tallow litter has a different chemical composition from native litter, a different concentration of essential soluble nutrients from native litter, and a faster decomposition rate compared to native plant litter. Sterilization experiments suggest that Chinese tallow litter is promoting …
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Assessing restoration potential in relict wetland soils: investigating the effect of wetland hydrology on soil microbial community composition and denitrification potential
Microbial communities are known to strongly influence rates of biogeochemical cycling in wetland ecosystems; specifically, they are strong determinants of rates of denitrification typically observed. Human induced land use changes have significantly reduced the acreage of wetland habitats, with dam …
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Effect of Soil Type, Composting, and Antibiotic Use on Fate of Antibiotic Resistance Genes and Microbial Community Composition in Dairy and Beef Manure Applied Soils
… and soil type on the quantity of ARGs and the microbial community composition of dairy and beef manure applied soil. ARGs were analyzed through novel metagenomic techniques and quantitative polymerase chain reaction of sul1, tet(W), and 16S rRNA gene, while the microbial community composition …
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Soil microbial function in a time of global change: effect of dairy antibiotics on soil microbial communities and ecosystem function
… for human health, the potential to disturb microbial communities and ecosystem functions they regulate is under appreciated. Antibiotics are commonly used in the livestock sector, accounting for 80% of antibiotic use domestically. This dissertation addresses three facets of this problem. …
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Landscape history and contemporary environmental drivers of microbial community structure and function
Recent work in microbial ecology has focused on elucidating controls over biogeographic patterns and connecting microbial community composition to ecosystem function. My objective was to investigate the relative influences of landscape legacies and contemporary environmental factors on the …
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Soil microbial response to land management practices and wildfire in Appalachian ecosystems
… is critically controlled by the activity of soil microbial communities. Understanding how soil microbial communities change as a result of different land management practices or natural disturbances can provide insight into the effects of these perturbations on ecosystem health, such as water …
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The Microbiome of Cystic Fibrosis Sputum and its Association with Incident Lower Airway Infections
… pathogens is linked to microbiome structure and composition. Individuals who experienced an incident infection with either P. aeruginosa or S. maltophilia were identified, and compared to uninfected controls matched for sex, age (+/-2 years), and birth cohort. Individuals were included if our …
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Determining the impact of carrion decomposition on soil microbial activity levels and community composition.
… useful for forensic investigators. Advances in microbial profiling techniques have made it possible to compare microbial community profiles obtained from evidence or crime scenes to individuals and vice versa. Profiling microbial communities associated with cadaver decomposition may provide …
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Molecular studies of the sources and significance of archaeal lipids in the oceans
… amendments on archaeal tetraether lipids and microbial community composition, I conducted large scale microcosm experiments. Experimental conditions did not promote the overall growth of archaea, but several changes in tetraether lipid abundance and relative ring distribution suggest that …
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Microbiology of the sulfur-dominated glacial ecosystem at Borup Fiord Pass, and high Arctic low-temperature spring associated microbial mats, The
… also make BFP an ideal location for studying how microbial organisms can utilize reduced and oxidized forms of sulfur to thrive in cold environments. Yet, due to human influence Arctic research sites may not remain cold perpetually also making the location ideal to study climate change. Over field …
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CRABS & ‘CROBES: THE TRIPARTITE RELATIONSHIP OF A HOST, PARASITE, AND THEIR RESPECTIVE MICROBIOMES
… This relationship among hosts, parasites, and microbial communities changes the dynamic of host-parasite evolution from a more traditional co-evolution, to a tripartite evolutionary relationship. My research aimed to resolve questions about the community composition and diversity of microbial …
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Influence of Petroleum Deposit Geometry on Local Gradient of Electron Acceptors and Microbial Catabolic Potential
… on localized gradients of electron acceptors and microbial community composition, factors that are critical to accurately estimating biodegradation rates. One-dimensional top-flow sand columns with 12-hour simulated tidal cycles compared two contrasting geometries (isolated tar "balls" versus …
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Microbial Diversity in Young Volcanic Soils
… but has been little studied with regard to microbial communities. Analysis of the distribution of 16S and 18S rRNA genes from bacteria and eukaryotes was done to compare microbial community composition between andisols and vitrisols. An experiment with samples representing four soil depths …
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Feedback by the soil microbial community on the distribution of two weeds
Soil microbial communities may influence the composition and species abundance of plant communities through the phenomenon of “soil feedback,” which is the tendency of a plant species to cause physical, chemical and/or biological changes in the soil that are beneficial or detrimental to its own …
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Microbial Communities Colonizing Leaves during Early Decomposition Stages
<p>Microbial communities associated with decaying leaves play an important role in the cycling of nutrients in stream ecosystems. In headwater streams that are deemed as heterotrophic, bacteria and fungi are main drivers of organic matter decomposition and thus partly responsible for facilitating …
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The Macroecology of Microorganisms: From Pattern to Process
… macroecological patterns and processes within microbial communities. I use a combination of data generating approaches including meta-analysis, published sequence datasets and databases, and high-throughput sequencing, coupled with modern statistical methods. Firstly, I show that metagenomic …
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