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 21 for “"spatio-temporal variation"”.
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Spatio-Temporal Variation in Ringed Seal (Pusa Hispida) Density and Habitat Use in the Last Ice Area
… surveys, this thesis provides the first study on spatio-temporal variation in ringed seal density and habitat use in their northern most range in the Canadian High Arctic, highlighting the importance of bathymetry and marine terminating glaciers to the summer habitat use of ringed seals in the …
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MODELLING THE EPIDEMIOLOGY, ECOLOGY, AND CONTROL OF AEDES-BORNE DISEASES
… and anthropogenic variables influence the spatio-temporal variation of Aedes abundance in Singapore’s high-rise public residential zones. Last, I developed an agent-based model to study the time-varying impact of sustained Aedes control in a wide range of dengue endemic settings. The …
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A “tick”-Ing Threat: The Surveillance And Ecology Of The Lyme Disease System
… New York State. My thesis demonstrates that spatio-temporal variation in environmental factors, specifically landscape and climatic features, accounts for the distribution and population sizes of both the tick vector and bacterium pathogen across space and time. The models accurately predict …
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Functional structure of herbivorous fish communities in the Wakatobi National Park, Southeast Sulawesi
… systems further. We aimed to understand the spatio-temporal variation among herbivore functional roles and how these were partitioned across species. We quantified the functional role of herbivores by excluding grazing activity on the reef. Algal communities responded with a significant …
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Biological assessment of tropical riverine systems using aquatic macroinvertebrates in Tanzania, East Africa
… similar macroinvertebrate assemblages'; and 'spatio-temporal variation in macroinvertebrate assemblages influence bioassessment', are tested. Macroinvertebrate and environmental data were collected from the Pangani, Rufiji and Wami-Ruvu basins. Univariate analyses; constrained and …
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THE EFFECTS OF LARGE HERBIVORES ON SMALL MAMMAL COMMUNITIES, PLANTS AND ECOSYSTEM PROCESSES IN NORTHERN ARIZONA
… often unclear what the magnitude or sources of spatio-temporal variation in these effects might be. I used a large-scale replicated elk-exclusion experiment to determine the effects of elk on small mammal communities, plants, and ecosystem processes.</p> <p>I found that five years of elk …
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THE EFFECTS OF LARGE HERBIVORES ON SMALL MAMMAL COMMUNITIES, PLANTS AND ECOSYSTEM PROCESSES IN NORTHERN ARIZONA
… often unclear what the magnitude or sources of spatio-temporal variation in these effects might be. I used a large-scale replicated elk-exclusion experiment to determine the effects of elk on small mammal communities, plants, and ecosystem processes.</p> <p>I found that five years of elk …
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Population crash of an endemic South African cyprinid: the role of non-native fish, drought and other environmental factors
… 25 km of the Oorlogskloof River to characterise spatio-temporal variation in sandfish abundance and size structure and evaluate the relative influence of different environmental factors on sandfish population trends. The environmental factors considered included other fish in the system, …
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The influence of spatiotemporal variation in food web models
… however, many food web studies continue to use temporally static and spatially homogenous representations of food webs. This thesis proposes that a detailed investigation of temporal and spatial trends in a large lake ecosystem can improve our understanding of the mechanisms and drivers of …
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Eco-geomorphological and hydrodynamic analysis of Mediterranean microtidal beaches in Southern Sardinia
… circulation in the surf zone. In addition, the spatio-temporal variation of the shorelines was investigated to estimate the accretion and retreat rates for each identified beach. The results highlighted that, over approximately 70 years, changes in shoreline position reflect dynamics associated …
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Understanding the microbiota in drinking water distribution networks – from municipal to indoor water supply systems
… study investigated the diversity, structure, and spatio-temporal variation of microbial communities in the municipal distribution system and indoor plumbing. The Champaign-Urbana water distribution system, which received conventionally treated and disinfected groundwater, was used as a model …
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Global soil respiration: interaction with macroscale environmental variables and response to climate change
… This dissertation research identifies how temporal and spatial variation in environmental factors affects global scale Rs modeling and predictions of future Rs under global warming. Chapter 1 describes the recommend time range for measuring Rs across differing climates, biomes, and seasons …
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Modelling malnutrition among under-five-year-old children in Ghana
… malnutrition; (2) investigated household level variations in nutritional outcomes of children; (3) explored, modelled and illustrated spatial variations in the risk of childhood malnutrition over Ghana; (4) explored, modelled, forecasted and illustrated spatio-temporal variations in the risk of …
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Ecology of the marsh rice rat (Oryzomys palustris) in southern Illinois: wetland dynamics, metapopulations, and trophic position
… My first objective was to assess the spatial and temporal variation in occupancy and turnover rates of a semi-aquatic small mammal at 2 hydrologically distinct wetland complexes over 3 years in southern Illinois. My second objective was to determine spatio-temporal variation in the trophic …
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El papel ecológico de los materiales orgánicos alóctonos en las comunidades de macroinvertebrados en playas atlánticas arenosas: patrones espaciales y temporales
… general aim of this thesis is to evaluate the spatio-temporal variation in the distribution and utilization of wrack debris by supralittoral arthropods and its biological responses to wrack removal, which, in turn, is relevant to the management of this key resource (i.e. wrack debris) on sandy …
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Spatial urban and peri-urban biodiversity patterns
… as bat activity patterns may be subject to spatio-temporal variation of environmental conditions and prey availability, further research would provide more insights into species occurrences and the factors affecting them. The findings of the current study underline the negative effect of the …
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Potential for using climate forecasts in spatio-temporal prediction of dengue fever incidence in Malaysia submitted
… proposes a potential framework of modelling spatio-temporal variation in dengue risk on a national scale in Malaysia using both climate and non-climate information. Early chapters set the scene by discussing Malaysia and Climate in Malaysia and reviewing previous work on dengue fever and …
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Validation, trend analysis & bias reduction through satellite fusion of the cloud-top height record from terra MODIS & MISR
… there is broad agreement between the large-scale spatio-temporal variation of height-resolved and total CA from MODIS and MISR over regions dominated by single-layered clouds. However, the inability of passive sensors to separate CA, CTH and opacity changes for multi-layered cloud systems likely …
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Heterogeneous Strain Distribution & the Effects of High Frequency Climate Change on the Evolution of Early-Stage Rift Systems: Case Studies from Lakes Tanganyika and Malawi (Nyasa), East Africa
… sedimentary processes, and climate change, and variations in the evolution of the system can be related to both tectonic and climatic processes.The far-field forces, and/or a summation of the forces available to split a continent are considered insufficient to rupture the strong continental …
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Conservation of polychaete biodiversity within the Port Stephens-Great Lakes Marine Park
… and abundance of marine biodiversity, and its temporal dynamics, is problematic for the selection and design of MPAs. To overcome this constraint, habitats are commonly used as a biodiversity surrogate for biodiversity in marine conservation planning to select MPAs and draw zone boundaries. …
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