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 23 for “"Annual changes"”.
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Long term seasonal and annual changes in rainfall duration and magnitude in Luvuvhu River Catchment, South Africa
… at investigating the long term seasonal and annual changes in rainfall duration and magnitude at Luvuvhu River Catchment (LRC). Rainfall in this catchment is highly variable and is characterised of extreme events which shift runoff process, affect the timing and magnitude of floods and …
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Assessment of patterns in the Namibian hake fishery based on commercial fisheries data, in relation to environmental factors
… for management, and to cover seasonal and inter-annual changes in density estimates of Cape hake (Merluccius capensis). It also attempts to explain hake variability of in terms of environmental indices based on satellite remote sensing, carefully chosen to reflect underlying oceanographic …
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A Seasonal Study of the Pituitary-Gonadal-Adrenal Axes in Peromyscus Leucopus from Natural Environments
… are responsible for these seemingly predictable changes. For many years the spectacular increase and decrease (crash) of certain arctic mammals has stimulated such research on sundry populations. Researchers at first sought a n explanation for the "crash”, however, most investigators now seek a …
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Assessment of coronary artery plaque progression using 64 slice multi-detector computed tomography (MDCT)
… a commercially available plaque analysis tool. Changes in calcified and non-calcified plaque volumes and cardiovascular risk factors were assessed over time using the Wilcoxon signed-rank test. Absolute and relative changes in plaque volume were also compared using the Mann–Whitney test, and the …
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Operating profile of the restaurant industry in Virginia
… data base to be used in the future to asess annual changes and mate trend comparisons. A questionnaire was mailed to 2,864 restaurant operations which were randomly selected from the total population of restaurants in Virginia. Demographic data, as well as financial information was collected …
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Estimating Trophic Position of Lake Oahe Walleye Using Stable Isotope Analysis
… diet studies are useful for determining changes in prey use, they can be time and labor intensive. Furthermore, they offer only a snapshot of recent feeding patterns when populations are sampled infrequently. I used stable isotope analysis to estimate walleye trophic position and then …
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Effects of Diet on Ovarian Development in Largemouth Bass, Micropterus Salmoides
… reproductive system of the female bass over an annual cycle. Changes in body weight , length and gonad weight were observed. Annual changes in plasma concentration of testosterone and 17!3-estradiol were monitored by radioimmunoassay. The relationship between these parameters were significantly …
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White-tailed deer hunting and habitat use in Robert Allerton Park
… a study site, my objectives were to investigate changes in deer habitat use and spatial clustering following 10 years of deer removal in RAP. I evaluated changes in annual deer counts within RAP’s three main habitat types, dry mesic upland forest, wet mesic floodplain forest and developed land …
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Snapping Turtle Life History on Lacreek Refuge, South Dakota
… obtaining an index of turtle population size and annual changes based on counting nesting females by driving selected refuge dikes were considered reliable. Capture – recapture methods yielded a population estimate of 2415 adult turtles on Lacreek Refuge in 1967. Fifty-nine percent of turtle nests …
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Funding of Higher Education: Variations in State Funding, Impacts of State Funding on Differential Tuition, and Variables Impacting Differential Tuition
… education in the United States has seen many changes since the Morrill Act of 1862. Specifically, the funding of higher education has changed greatly over the last half century, from very low tuition and relatively high state subsidies to an increased reliance on tuition to fund higher …
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Photoperiodism in the ewe: Endogenous circannual rhythms and olfactory mechanisms influencing reproductive activity
… non-breeding activity that are correlated with annual changes in daylength. The seasonal nature and timing of reproductive activity in this species is thought to result from the complex interplay of endogenously generated rhythms with exogenous factors including photoperiod and social cues. …
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Using massive online choice experiments to measure changes in well-being
… a better approach is now feasible. Specifically, changes in consumer surplus (compensating expenditure) are superior to changes in GDP as a measure of changes in consumer well-being, especially for digital goods. In practice, consumer surplus has been difficult to measure. We explore the potential …
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Using artificial neural networks to forecast changes in national and regional price indices for the UK residential property market
… time-series of house prices in order to forecast changes in the residential propertymarket at national and regional levels.Neural networks were demonstrated to be successful in producing time-seriesforecasts of changes in the housing market, particularly when combined in simplecommittees of …
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A New Conceptual Automated Property Valuation Model for Residential Housing Market
… published figures. It successfully modelled the annual changes in residential property prices for hard to predict periods 2007-2008 during the global financial crisis and 2010-2012 residential property boom when the interest rates were on a downwards trend. CAPVM also outperformed the prediction …
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Modeling the spatial and temporal dynamics of coastal marsh birds
… relationship across scales, and to model annual changes in bird distribution. Study sites were in the fresh and intermediate (oligohaline) marshes of the Chenier Plain coastal region of southwest Louisiana and southeast Texas. I captured king rails for a two year radio telemetry study, and …
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Quantifying and Simulating Fine-Scale Spatial Patterns in Plant Populations
… in this dissertation shows that important inter-annual changes in spatial pattern occur in <em>Bouteloua gracilis</em> populations at multiple, sub-meter scales, reinforcing the belief that local interactions are important factors in community structure (Chapter 1). It further illustrates that …
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Water quality modelling of eutrophied reservoirs in South Africa
… considered only the steady state, or at most, annual changes. The models simulated annual mean phosphate-P concentrations with varying degrees of success, but a significant relationship between observed and simulated chlorophylla concentrations could not be obtained, i.e. these models could not …
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Implementing a new method to measure δ³⁴SSO₄ in ice cores to assess sulfate sources in West Antarctica
… of δ³⁴SSO₄ in an ice core to reconstruct sub-annual changes in sulfate sources at Dyer Plateau in West Antarctica. I also confirmed the δ³⁴SSO₄ signature of sea salt from the sea ice surface and further constrained the sulfur isotopic composition of biogenic sulfate. However, I was unable to …
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Sharp-Tailed Grouse (Tympanuchus phasianellus) Habitat Selection and Population Trends in Saskatchewan
… in the province; and (2) understand population changes in relation to weather conditions. My research was undertaken to address these knowledge gaps for the plains subspecies of the sharp-tailed grouse in Saskatchewan. Leks, communal dancing grounds, form the basis for much of the life history …
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Assessment of grassland ecosystem functioning: Carbon dioxide exchange and the dynamics of carbon and nutrient pools in temperate and Mediterranean grasslands
… depends on the prevailing higher temperatures, annual changes in water balance and possibly nutrient removal from the ecosystem in Mediterranean regions.
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