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 20 for “"co-occurrence patterns"”.
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Analysis of the SLO Bay Microbiome from a Network Perspective
<p>Microorganisms are key players in the ecosystem functioning. In this thesis, we developed a framework to preprocess raw microbiome data, build a correlation network, and analyze co-occurrence patterns between microbes. We then applied this framework to a marine microbiome dataset. The dataset …
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Plant Height Dynamics and Competition: From Local Interactions to Global Patterns
Competition is widely recognized as a major force influencing plant community structure, with functional traits predicted to mediate competitive interactions between species. Despite theoretical predictions that taller plant species should exert stronger competitive effects on neighbours, plant …
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Assessing risk to native ecosystems: using exotic ants as a model
Invasive species are widely recognised as drivers of ecological change. As such, understanding the processes that facilitate invasion success, and the potential mechanisms and magnitude of impact, are critical for effective biosecurity management. Predicting risk associated with exotic species, so …
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Cumulative Vulnerabilities: Substance Use in Adolescence and in Recovery
… disorders (SUDs) pose a significant health and economic concern in the United States. Conditions and comorbidities exist that are associated with substance use onset, continuation, and outcomes. In the theory of Reinforcer Pathology, we can categorize these conditions into vulnerabilities, or …
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Seasonal and lunar patterns of peach blossom jellyfish (Craspedacusta sowerbii) in Michigan
… Given its uncertain status, understanding the ecology of this species is a priority. To characterize population dynamics during the medusa season, surface water temperature and medusa abundance were surveyed at six inland lakes in Michigan. Occurrence records of C. sowerbii in Michigan were then …
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Inferring rare bumble bee species occurrences from nontarget bumble bee assemblages
… particularly among insects, threaten the vital ecosystem services that such groups provide, which are crucial to the productivity of agricultural systems and the success of wild plant communities. Bumble bees are some of the most effective pollinators in temperate climates thanks to their cold …
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Latent Semantic Web Service Discovery and Composition Framework
… program across the web using standard protocols. Web services are special because they are independent of the platform, programming language, and model design. In current web applications, more businesses are gradually publishing their business as services over the web. This growing number …
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Inference and robotic path planning over high dimensional categorical observations
… technology have enabled oceanographers to collect vast amounts of spatiotemporally-distributed, sparse, highdimensional categorical data. Statistical models, particularly in streaming and computationally constrained settings, have lagged behind data collection. Recent developments in topic …
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Ecological Assembly of Leaf-Litter Anuran Communities Across a Neotropical Land-Bridge Archipelago
The conspicuous variation in time and space of richness and composition of biological communities has intrigued ecologists for decades. In this dissertation, I explore the patterns and ecological mechanisms that underlie the community assembly of leaf-litter anurans on a Neotropical archipelago. I …
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The impact of pine plantations and alien invertebrates on native forest and fynbos invertebrate communities in Table Mountain National Park
… species richness. This study frames invasion ecology theory in a conservation context, and examines the impact of planting and felling pine on litter invertebrate communities, by comparing invertebrate diversity between pine plantations and native vegetation. Impacts of the worst invasive alien …
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Inference and Robotic Path Planning over High Dimensional Categorical Observations
… technology have enabled oceanographers to collect vast amounts of spatiotemporally-distributed, sparse, high dimensional categorical data. Statistical models, particularly in streaming and computationally constrained settings, have lagged behind data collection. Recent developments in topic …
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Spatiotemporal Big Data Analytics for Future Mobility
… Terabytes of earth observation data are collected every day from thousands of places across the world. Modern vehicles are increasingly equipped with rich sensors that measure hundreds of engine variables (e.g., emissions, fuel consumption, speed, etc) annotated with timestamps and …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
… remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my thesis was to develop and evaluate …
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Incorporating plant community structure in species distribution modelling: a species co-occurrence based composite approach
… remotely sensed (RS) imagery is widely used in ecological studies and conservation planning, and the performance is frequently limited by factors including small plant size, small numbers of observations, and scattered distribution patterns. The focus of my thesis was to develop and evaluate …
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Natural Language Processing methods for short informal text
… playing a great role in this change as it has become an essential part of peoples social life. Thoughts, ideas, feelings, or even special moments are the main contents of the posts on Twitter and Facebook which are the most popular social media platforms. In this work, we addressed the change in …
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Patterns, Processes And Models Of Microbial Recovery In A Chronosequence Following Reforestation Of Reclaimed Mine Soils
Soil microbial communities mediate important ecological processes and play essential roles in biogeochemical cycling. Ecosystem disturbances such as surface mining significantly alter soil microbial communities, which could lead to changes or impairment of ecosystem functions. Reforestation …
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Quantitative Analyses of Normal and Precancerous Somatic Evolution in Human Tissues
… of positive selection in healthy tissues. By comparing observed numbers of synonymous passengers to the numbers expected due to driver mutations in canonical cancer genes, we showed in chapter 2 and 3 that it is possible to quantify missing selection left to be explained by unobserved drivers …
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Epidemiology of antimicrobial resistance at the livestock-human interface in an urban environment: a One Health approach
… livestock in urban Nairobi. To achieve this, E. coli isolates were systematically collected from sympatric human and livestock populations in 99 households across Nairobi, Kenya. E. coli was characterised both phenotypically (through antimicrobial susceptibility testing) and genetically (through …
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Applying ecological models to positive interactions among lotic fishes: implications for population and community regulation at multiple spatial scales
Positive biotic interactions such as mutualism, commensalism and facilitation are ubiquitous in nature, but historically have received considerably less research attention than negative interactions such as competition, predation and parasitism. The paucity of research on positive interactions is …
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Effects of fragmentation and invasion on ant communities
… a strong association between them, the relative contribution of each to biodiversity loss has not always been clear. Habitat fragmentation is a consequence of habitat destruction when continuous areas of natural habitats are divided into small, isolated fragments, and has detrimental consequences …