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 68 for “"alpha diversity"”.
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The Vaginal Microbiome Related to Reproductive Traits in Beef Heifers
… and the number of observed OTUs were used as alpha-diversity measures resulting in no significant differences in fecal samples (P = 0.95, P = 0.66) and significant differences for vaginal samples due to pregnancy status and/or time (P = 0.0056, P = 0.0015). No differences in beta-diversity …
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Microlepidoptera of Illinois hill prairies
… represent an overwhelmingly large percentage of diversity within the order, remain poorly known despite their ecological importance in many plant communities. In this thesis, I undertook several studies of microlepidoptera diversity in a natural community type (hill prairie) and a managed …
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The Relationship Between Wildlife Biodiversity and Landscape Characteristics in Virginia
Wildlife biodiversity provides a variety of ecosystem services and is an important indicator of overall ecosystem health. This research investigates the relationship between wildlife biodiversity and landscape characteristics in Virginia. The goal is to produce predictive models of biodiversity …
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Altered Vulvar Microbiomes in Vulvar Lichen Sclerosus
… sequences. Shannon index was used to quantify alpha diversity. Unweighted UniFrac (bacteria) and Bray-Curtis dissimilarity (fungi) were used to quantify beta diversity. Relative abundance testing was performed at sites with significant community structural alterations using Linear discriminant …
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Microbiome Dynamics in Broilers Infected with Infectious Bronchitis Virus and the Protective Role of Lactobacillus-Based Probiotics
… score compared to control. Significantly higher alpha diversity indexes including observed Operational Taxonomic Units (OTUs) and Shannon was observed in IBV challenged group compared to control in cecum at 6 and 15 dpi, whereas tracheal microbiome of IBV challenged group showed significantly …
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The role of sampling location and depth in the performance of lake plant environmental DNA metabarcoding
… DNA (eDNA) methods permit broad yet detailed biodiversity sampling to be performed with minimal field effort, but uncertainty remains regarding the spatial resolution necessary for effective sampling. We analyze eDNA samples from twelve temperate lakes via ITS1 rRDNA metabarcoding for aquatic and …
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Management of critically endangered renosterveld fragments in the Overberg, South Africa
… it is a homogeneous habitat with low levels of alpha diversity and species turnover. This is exacerbated by the widely accepted, although not proven, hypothesis which states that current-day renosterveld is derived from a pristine C4 grassland and that the dominance of asteraceous shrubs is …
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The impact of early life dietary patterns on weight status, fecal microbiota and volatile fatty acid composition in 2-year-old children enrolled in the STRONG Kids 2 cohort
… the HF DP and Prevotella, Prevotella copri, and alpha diversity, respectively, and there was no association between Bacteroides, the Firmicutes to Bacteroidetes ratio (F/B ratio), or alpha diversity, respectively, and the PS DP. HF DP scores positively correlated with VFA concentrations (µmol/g …
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Factors Shaping Macrofaunal Polychaete Communities in the Gulf of Mexico
… composition, density, taxonomic and functional diversity in deep-sea benthic polychaete communities in the Gulf of Mexico (GoM). The study includes samples from two major sampling programs: the Deep Gulf of Mexico Benthos (DGoMB) program (2000?2002) (51 stations, 200-3700 m) and the SIGSBEE …
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Benign, potentially malignant & malignant oral lesions; an analysis of oral and gut microbiota
… as biomarkers for oral malignancy. We looked at alpha diversity, beta diversity, taxonomy, differential abundance, and functional profiling. Results: Our results showed distinct gut microbial profiles between benign and malignant groups and the association of specific microbes in oral saliva, …
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Bacterial and archaeal community structure across a gradient of saline lakes in Kiritimati, Republic of Kiribati
… pH as major drivers of community variability. Alpha diversity measurements show no apparent link between salinity and microbial diversity. Extremely saline samples had both higher and lower Shannon index values, whereas lower salinity groups showed a range of Shannon index values. Our findings …
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Caracterização da microbiota intestinal, perfil inflamatório e integridade da barreira gastrointestinal de crianças diagnosticadas com transtorno do espectro autista
… resistance gene analysis. Relative abundance, alpha diversity, and beta diversity analyses were performed to characterize the microbiota and resistance genes, along with differential relative abundance analysis. Zonulin, Claudin, and Occludin concentrations were analyzed from fecal samples. The …
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Abyssal polychaete assemblages along latitudinal gradients of productivity in the equatorial Pacific and North Atlantic Oceans
Patterns in polychaete abundance, body size and diversity were investigated at 12 sites between 4300 and 5000 m in the central Pacific and the north-east Atlantic. In the central Pacific, three of the sites (EqPac 0N, 2N and 5N) were observed to lie under high surface productivity regimes, and they …
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Gut microbes and brain function
… residing there. If the composition or the diversity of the gut microbiota is impaired, this can have negative consequences for host health and has been associated with disorders such as obesity, diabetes, inflammatory diseases, and neuropsychiatric illnesses including anxiety and …
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Plant communities in field margins of agricultural landscapes: species distributions, functional traits, and contributions to landscape function
… to ecosystem functions by supporting biodiversity, preventing soil erosion, contributing in nutrient cycling and improving soil stability. This thesis is aiming to further our understanding of the processes governing plant community structure and resulting functioning in agricultural …
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Life history, diversity and patterns of bat community structure in the Spring Mountains of southern Nevada
… bat activity; Relationships between local (alpha) bat diversity and local environmental variables were also investigated. Species diversity varied along an elevational gradient. Local diversity was lowest at high elevation, Pine-fir sites, and highest at low elevation, Pinon-juniper sites. …
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What Drives Gut Microbial Diversity and Community Structure Among Closely-Related Host Species?
… Phylogeny may have a unique effect on GMB diversity and community structure (i.e., a GMB profile) via phylosymbiosis, a theory in which the evolution of hosts matches the evolution of their associated microbiota. Elucidating phylosymbiosis in mammals is difficult because multiple intrinsic …
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The effects of salinity on the cutaneous microbiome and pathogen infection on the Pacific Tree frog (Pseudacris regilla) in Monterey Bay, California, USA
… significant driver of bacterial composition and diversity in both frog and environmental samples. Salinity as a continuous variable was negatively correlated with bacterial alpha diversity in frogs, while the environmental microbial communities remained consistent across the salinity gradient. …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… community structure with associated increases in alpha diversity and overall community structure. However, functional processes tended to correlate better with changes in C:N ratio. Collectively, these biogeochemical and microbial indicators suggest that high degrees of beetle-induced mortality …
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Computational insights into the ecology of the human microbiota
… affect the stability of the human microbiota. Alpha-diversity is strongly correlated with stability, but the direction of this correlation changes depending on the body site or subject being examined. In contrast, beta-diversity is consistently negatively correlated to stability. I show that a …
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