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 20 for “"species accumulation"”.
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Using species accumulation curves to study change through time in a diverse butterfly fauna along an elevational gradient
… in the population dynamics of butterfly species across geographically diverse locations within Northern California. The goal of this thesis can be summarized in the following parts: i) to parameterize and fit the skewed log-logistic model to the observed species accumulation curves at …
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Using species accumulation curves to study change through time in a diverse butterfly fauna along an elevational gradient
… in the population dynamics of butterfly species across geographically diverse locations within Northern California. The goal of this thesis can be summarized in the following parts: i) to parameterize and fit the skewed log-logistic model to the observed species accumulation curves at …
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Comparative Impacts of Irradiation on Antioxidant Compounds of Scalded and Non-scalded Skin of Granny Smith Apples
… of antioxidant systems promoted reactive oxygen species accumulation and membrane damage. While certain antioxidants appeared to be upregulated as a stress response, others were depleted. Irradiation significantly reduced ascorbic acid up to 45.7% and campesterol up to 81.6% in a dose-dependent …
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Temporal variation in fruit-feeding forest butterfly communities in Sabah, Borneo.
… September 2000). This study focused on Nymphalid species whose adults feed on rotting fruit. A total of 3996 individuals from 63 species were recorded during the study. Rates of species accumulation were slightly higher in logged forest than in primary forest, but there was no difference between …
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Regulation of Active DNA Demethylation and its Role in Fertility in Arabidopsis thaliana
… could be a result of altered reactive oxygen species accumulation. This work has led to an increase in our understanding of the mechanisms by which ROS1 is regulated, and the mechanisms by which active demethylation affect transcription and development of the plant.
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Faunal variation and its potential for sampling bias in the Morgarts Beach Member of the Yorktown Formation (Pliocene)
… testing for the homogeneity, or lack thereof, in species assemblages obtained from samples collected from three localities within the Morgarts Beach Member. Multivariate analysis of variance, two-way analysis of variance, multiple comparison tests and cluster analysis were performed on data …
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Diversity and spatial distribution of fungal endophytes in a Eucalyptus grandis tree
… endophyte infections. Only 85 fungal endophytic species were identified amongst isolates from one of these trees, using the conventional DNA bar-coding approach. Fifteen times more species/MOTU was thus recovered using a metagenetics compared to an isolation approach. Despite this high diversity …
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HC-SCR of NO\(_x\) emissions over Ag-AL\(_2\)O\(_3\) catalysts using diesel fuel as a reductant
… (reaction kinetics) and physical (mass transfer, species filtration) processes. These effects were examined under ‘passive’ and ‘active’ operation of the respective catalysts. Diesel oxidation catalysts (DOCs) and unique prototype catalysts were also utilized in order to reduce possible poisoning …
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The Effect of Environmental Perturbations on the Plant Phyllosphere Microbiome
… on bacterial community richness, evenness, novel species accumulation, or composition. Instead, longer seasonal trends determined diversity and compositional patterns in T. latifolia, while canopy structure had the strongest influence on M. grandiflora. These findings suggest that rain does not …
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Analyses of the MEC1 DNA Damage Pathway in Saccharomyces cerevisiae
… Failure to preserve these checkpoints results in accumulation of mutated DNA and aberrant cell phenotypes that are characteristic of human disease. The yeast, Saccharomyces cerevisiae, utilizes the MEC1 checkpoint pathway to regulate the DNA damage response. This study addressed two overarching …
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Investigating the invasive and cytoprotective properties of the heme binding protein HRG-1 in cancer cells
… of HRG-1 in HeLa cells increases toxic heme accumulation, reactive oxygen species accumulation, and DNA damage resulting in caspasedependent cell death. Mutation of essential heme binding residues in HRG-1 results in decreased heme binding to HRG-1. Interestingly, cells expressing …
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Development of monitoring methods for crayfish populations
… Timed search sampling was used to capture all species present and assess crayfish relative abundance for each site, and quantitative kick seining was used to assess crayfish mean density (number per m2) in riffle habitats. Number of samples required for species richness estimation was analyzed …
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Fish parasites as bio-indicators of heavy metals in two South African embayments
… capensis) and two common sand shark species (Rhinobatos annulatus and Rhinobatos blochii) were caught off False Bay and Saldanha Bay and surveyed for their parasite community in 2013 and 2014. The surveys were used to build species accumulation curves (SAC) and calculate biodiversity …
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Ecology of Mid-Atlantic bats after white-nose syndrome: communities, reproduction, and diet within an urban-to-rural gradient
… (WNS) has reduced the abundance of many bat species within the United States' mid-Atlantic region, including the endangered Indiana (Myotis sodalis), threatened Myotis septentrionalis (northern long-eared bat) and other bats of conservation concern, such as Perimyotis subflavus (tri-colored …
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The presence, diet and relative abundance of otters (Carnivora: Mustelidae) in Northern Namibia
Four species of otters (Carnivora: Mustelidae) are known to occur in Africa: Eurasian otter Lutra lutra, spotted-necked otter Hydrictis maculicollis, African clawless otter Aonyx capensis and the Congo clawless otter Aonyx congicus. The African clawless and Spotted-necked otters are known to occur …
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Estimating leopard density in a coastal protected area of the Western Cape, South Africa
… for reserve managers who work with endangered species and are responsible for regional conservation planning – especially in cases where both predator and prey are of vulnerable populations. A small coastal area within the De Hoop Nature Reserve has been fenced off from the reserve with the …
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Bee Abundance Along a Tropical Montane Elevational Gradient and Implications for Crop Pollination Services
… and thermal specialization for tropical bee species to understand how these important pollinators may respond to warming temperatures. My four-year study (2016-2019) aims to quantify bee abundance differences across an elevational gradient. I focus on the two bee tribes comprising the most …
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Spatial variation in small mammal communities across the Karoo Shale Gas Development Area of South Africa
… Thicket (3 sites). Four xerophilous/generalist species (Micaelamys spp. (Rock rats), Gerbilluscus paeba (Hairyfooted Gerbil), Macroscelides proboscideus (Round-eared Sengi), and Elephantulus spp. were numerically dominant at most sites, and within most biomes/bioregions; while five rare species …
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The impacts of habitat fragmentation of Tsitsikamma fynbos, South Africa, on avian nectarivore presence, abundance, and pollination
… may result in reduced seed-set for the plant species that rely on them. This study considers how selected erica and protea plants and the sunbirds and sugarbird that pollinate them are affected by fynbos habitat fragmentation. The study was conducted in an area of fragmented Tsitsikamma …
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Quantification of the bioccumulation potential of various chemical elements from coal fly ash using Brassia juncea and Spinacia oleracea L and its implication for phytoremediation of coal fly ash dumps
… on the examination of the chemical elements bioaccumulation and phytoremediation potential of Indian mustard (Brassica juncea) and Spinach (Spinacia Oleracea L). X-ray fluorescence (XRF) was used to analyze the elemental composition of FA and soil, Scanning Electron Microscope (SEM) to examine …