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 34 for “"Taxonomic Levels"”.
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The influence of verbal cues on young children's categorization of works of art
… match. The slides were grouped according to taxonomic levels: superordinate, basic, and subordinate. The results show a significant difference in how the children at each age level use verbal cues. There was also a significant difference between age and group performance across verbal cues. …
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Comparative analyses of nuclear ribosomal RNA gene sequences and morphological characters of selected taxa of Loculoascomycetes: Phylogenetic implications
… schemes have been proposed based on different taxonomic criteria. Phylogenetic relationships of many organisms in the Loculoascomycetes are vague because of the complex array of these organisms. The research in this dissertation was conducted at different taxonomic levels using both molecular …
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Genetic diversity and interspecific relationships in Banksia L.f., (Proteaceae) / Tina Louise Maguire.
… are assessed for their usefulness at various taxonomic levels within the genus. The results indicate a close relationship between Banksia and Dryandra, which are sister genera in the tribe Banksiae, family Proteaceae.
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Palynology of the Cape's top ten richest families and its taxonomic implications
… which are phylogenetically useful at higher taxonomic levels (including aperture type, exine structure, pollen-unit, polarity, symmetry, shape), and their evolutionary trends are examined. Monocotyledons differ from eu-dicotyledons (and eu-dicots from basal-dicots) in their aperture number …
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The diversity and functioning of coastal microbial communities
… Across domains, the relative importance of taxonomic factors was much higher in bacteria, indicating a possible increased role of dispersal limitations for that domain. Co-occurrence networks were then constructed using the same dataset to investigate if there were any relationships between …
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Comparative Morphometrics of the Sacral Vertebra in <em>Aneides</em> (Caudata: Plethodontidae).
… between taxa, identification to lower taxonomic levels remains inconclusive. Linear morphometrics and dorsal Procrustes landmarks were the most successful metrics to identify known taxa. Two unidentified fossil salamander sacral vertebrae from Oregon Caves National Monument are examined …
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Cyclopentenoid Cyanogens: Their Chemistry, Importance in Plant Systematics, and Their Role in the Coevolution of Plants and Insects (Phytochemistry, Cyanogenic, Glycosides, Nmr)
… The value of such a distribution in assessing taxonomic relationships was tested numerically in one genus. Cyclopentenoid cyanogens were found to be useful indicators of phylogenetic affinity at all taxonomic levels. A correlation was discovered between the pattern of elaboration of plant …
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Mitochondrial genomics and northwestern Atlantic population genetics of marine annelids
… fine-scale questions to be asked at a variety of taxonomic levels. At the phylogenetic level, whole mitochondrial genome sequencing of two polychaetes (the deep-sea tubeworm Riftia pachyptila and the intertidal bamboo worm Clymenella torquata) supports the placement of leeches and oligochaetes …
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Multivariate analyses of the impact of offshore marine mining on the benthic macrofauna off the west coast of Southern Africa
… 6 study areas. Aggregation of the data to higher taxonomic levels did not result in the loss of information, and in fact, improved the resolution of the community patterns. Multivariate analyses were therefore performed using the community data aggregated to genus-level. Hierarchical agglomerative …
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Mitochondrial Genomics: structure, inheritance and phylogenetic utility of the Mitochondrial genome in Bivalvia and Insecta
… and phylogenetic marker at different taxonomic levels in different taxa of Metazoa. From a methodological standpoint, my main effort was dedicated to the sequencing of complete mitochondrial genomes, and the approach to whole-genome sequencing was based on the application of Long-PCR …
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The Influence of Land Coverage and Soil Chemical Factors on Soil Bacterial Community Diversity and Structure in Cedartown, GA, USA
… greater diversity at the phylum and class taxonomic levels than non-contaminated reference sites. Similarly, the bacterial community structure differed from the reference (low Pb) sites. To Investigate the influence of land coverage and soil chemical factors on bacterial diversity and …
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High-resolution time series reveals differential behaviors of closely-related microbes in coastal communities
… I show that despite apparent stability at higher taxonomic levels, there is rapid turnover of the community at the sequence level, and that for sequences one nucleotide apart there is evidence for distinct ecologies. Second, in the bacterial community, I use a much more resolved genetic marker …
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The Macroecology of Microorganisms: From Pattern to Process
… as it detected more diversity at all taxonomic levels. However, cost analysis shows that metagenomics is prohibitively expensive for macroecological studies, where many samples are required. I find that classic macroecological patterns, such as the distance-decay of similarity, are …
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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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Mitochondrial genomics and Northwestern Atlantic population genetics of marine annelids
… fine-scale questions to be asked at a variety of taxonomic levels. At the phylogenetic level, whole mitochondrial genome sequencing of two polychaetes (the deep-sea tubeworm Riftia pachyptila and the intertidal bamboo worm Clymenella torquata) supports the placement of leeches and oligochaetes …
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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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Characterizing the Microbiome of Scottish Freshwater Pearl Mussels (Margaritifera margaritifera): A Metabarcoding Analysis using Next-Generation Sequencing
… interactions. This study provides the first taxonomic characterization of the microbiome in Scottish M. margaritifera populations. Microbial communities from three distinct mussel populations were compared to those in river water, with geographic and ecological factors evaluated as potential …
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Expression and Function of the Chloroplast-encoded Gene matK
… gene at nucleotide and corresponding amino acid levels. The high number of nucleotide substitutions and length mutations in matK has provided a strong phylogenetic signal for resolving plant phylogenies at various taxonomic levels. However, these same features have raised questions as to whether …
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Sexual selection and biological diversification: Patterns and processes
… sister taxa. The pattern holds across taxonomic levels and sensory modalities, and whether the male, or the female, is the displaying sex. Additional data supporting the sexual selection-diversity hypothesis in other taxa are also discussed. Chapter II investigates how variation in the …
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