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 24 for “"Taxonomic Resolution"”.
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A Cost Effective Approach to Taxonomic Resolution For Bioassessment and Monitoring Programs in the State of Georgia
… One means of examining costs is to assess taxonomic resolution. Taxonomic resolution not only assesses the sensitivity of biocriteria, it also allows one to make recommendations to state agencies regarding the costs and benefits of recommended taxonomic identification requirements. Due to …
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The relationship between sediment composition and infaunal polychaete communities along the southern coast of Namibia
… structure, as the entire fauna, at a number of taxonomic resolutions. A total of 44 samples were collected by De Beers Marine (Pty) Ltd in 1999 off the southern coast of Luderitz from depths between 40 m and 90 m. The sediments varied from soft muds (45 μm) to gravel (> 710 μm). Forty-three …
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Environmental DNA (eDNA) Metabarcoding: Analysis of Freshwater Macroinvertebrate Community Structure and Diversity
… metabarcoding, which can be used to identify the taxonomic composition of entire communities, has the potential to increase both survey efficiency and taxonomic resolution. In this study, I evaluated the efficacy of eDNA metabarcoding to document freshwater macroinvertebrate diversity in two …
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Macrobenthic ecology of the West Shetland Slope
… although to a lesser degree. The level of taxonomic resolution required was investigated and the conclusion drawn was that to achieve adequate discrimination between stations for this area, the macrofauna should be identified to species level.
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Analyses of Two Aspects of Study Design for Bioassessment With Benthic Macroinvertebrates: Single Versus Multiple Habitat Sampling and Taxonomic Identification Level
… of habitat sampling design and level of taxonomic identification on the interpretation of ecological conditions of ten small streams in western Virginia was examined. Cattle watering and grazing heavily affected five of these streams (impaired sites). The other five streams, with no …
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Carbon flow and food web structure in the mesopelagic zone of the North Atlantic Ocean
… mesopelagic carbon flow coupled with finer scale taxonomic details. In Chapter 2, I analyze the diets of seven abundant mesopelagic fish species by combining the integrative power of CSIA-AA with the instantaneous, taxonomic aspects of DNA gut metabarcoding. Three primary diet types were …
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Modern Pollen-Vegetation Relationships In Ghana, Tropical West Africa
… by modern tropical vegetation, and improving the taxonomic resolution of pollen identification are vital in generating high quality interpretations of fossil pollen assemblages. Lake Bosumtwi, Ghana, is a 1 million year old meteorite impact crater-lake, in which pollen has been deposited tracking …
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Molecular and morphological factors contributing to the resolution of the taxonomy of Octopus vulgaris Type III
… known within this complex which requires taxonomic resolution is the Southern African lineage, Octopus vulgaris Type III. This taxon was not included in a recent global morphological assessment of the complex and few specimens were included in phylogenetic studies. Mitochondrial barcodes …
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Carbon flow and food web structure in the mesopelagic zone of the North Atlantic Ocean
… mesopelagic carbon flow coupled with finer scale taxonomic details. In Chapter 2, I analyze the diets of seven abundant mesopelagic fish species by combining the integrative power of CSIA-AA with the instantaneous, taxonomic aspects of DNA gut metabarcoding. Three primary diet types were …
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Spatial and Temporal Influences of Water Quality on Zooplankton in Lake Texoma
… factors. Statistical power, sample size and taxonomic resolution were examined. When monitoring seasonal and annuals trends in abundance, the greatest statistical power was achieved by analyzing count data at taxonomic levels above genus. Taxonomic sufficiency was assessed to determine if …
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Benthic meiofaunal and micro-eukaryotic inhabitation of extreme environments: Submerged caves and hydrocarbon seeps
… foraminifera-specific primers yielded coarse taxonomic resolution, highlighting the need for an improved molecular reference database. Chapter 4 examines the cellular ultrastructure of foraminifera inhabiting hydrocarbon seeps using Transmission Electron Microscopy (TEM). Two extant …
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DNA-based monitoring of ichthyoplankton for application to fish biodiversity conservation and fisheries management
… while valuable, present limitations in terms of taxonomic resolution. DNA metabarcoding has emerged as a powerful alternative, offering high-throughput, cost-effective, and precise species identification. This thesis aimed to apply DNA metabarcoding to ichthyoplankton samples collected along the …
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Fine-scale ecological dynamics of closely related marine microbes
… dynamics at bulk scales and with low genetic resolution. Thus, little is known about the effects of finer structure. In this thesis, I show that characterizing the dynamics of environmental microbes with finer spatiotemporal and genetic resolution reveals otherwise concealed dynamics. I use …
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Integrated approaches for monitoring sharks: Leveraging machine learning, big data, and molecular biology
… effort by up to 95% while preserving high taxonomic resolution, and demonstrated iterative improvement through survey-specific data boosting. Third, I designed scalable pipelines to mine and filter >5 million social network (Instagram, Flickr) and open source (iNaturalist and Global …
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Spatiotemporal Variability in the Macroinvertebrate Community of a Small Coastal California Stream, Little Creek, Davenport, California
… organisms were identified at family level taxonomic resolution. Non-metric multidimensional scaling (NMDS) and Analysis of Variance (ANOVA) procedures were performed to describe longitudinal patterns in community composition and determine the significance of collected environmental …
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Nematodes as indicators of sustainable soil health management practices in corn-soybean production
… greatly increased nematode detection and taxonomic resolution. The enhanced primer specificity enabled the recovery of nematode assemblages from soil DNA, and was comparable to those from nematode DNA. The direct nematode DNA extraction yielded consistent community profiles regardless of …
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Plant Successional Patterns at Sperry Glacier Foreland, Glacier National Park, MT, USA
… plot. All sampled vegetation was identified with taxonomic resolution down to species whenever possible. I assessed vegetative trends across terrain age ranges using Kruskal-Wallis and Dunn's tests. I used two models, generalized linear models (GLMs) and Classification and Regression Trees …
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Imaging nanoscale pollen morphology with Superresolution Structured Illumination Microscopy
… paleoecology all require ever-increasing imaging resolutions for accurate investigations of morphological hypotheses. Of these applications, the visualization of nanoscale plant morphology, such as the taxonomically diagnostic surface texture of individual pollen grains, is a special challenge for …
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Genomic tools to investigate and characterise emerging and reemerging disease in aquatic invertebrates
… of aquatic invertebrates, I improved the taxonomic resolution and enabled the design of robust diagnostic assays for closely related protist species. These methods were then applied to two closely related Marteilia species, which resolved longstanding taxonomic ambiguities and provided …
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Seasonal predictability and interannual variability in coastal planktonic communities
… in coastal plankton using two decades of high-resolution observations from the Martha’s Vineyard Coastal Observatory (MVCO). Through automated flow cytometry, we analyzed community dynamics across multiple taxa representing diverse functional groups and seasonal strategies. The first component …
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