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 49 for “"spatiotemporal patterns"”.
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Spatiotemporal patterns of insect diversity and multitrophic interactions across a tree diversity gradient
Während des letzen Jahrzehnts ist der Zusammenhang zwischen Biodiversität und Ökosystemfunktionen bzw. -dienstleistungen, wie z. B. Bestäubung oder biologische Schädlingskontrolle, ins Zentrum ökologischer Forschung gerückt. Vor allem Verlust von Biodiversität durch anthropogen bedingte Störung und …
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Spatiotemporal Patterns of Distribution and Drivers of Neonicotinoid Insecticide Fate in Canadian Prairie Pothole Wetlands
Designed for the protection of major agricultural crops, neonicotinoids are the fastest-growing class of insecticides used against a broad spectrum of insect pests. Although neonicotinoid toxicity toward non-target organisms (e.g., bees, aquatic insects) has been well-studied, less is known about …
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Zooplankton population variability in a warming ocean: Modeling spatiotemporal patterns and drivers within a dynamic shelf ecosystem
… statistical models to shed light on the patterns and mechanisms influencing the population dynamics of this indispensable species in the subarctic North Atlantic. First, spatial modeling of C. finmarchicus synchrony reveals that populations in the well-connected NES ecosystem are highly …
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Spatiotemporal Patterns and Drivers of Surface Water Quality and Landscape Change in a Semi-Arid, Southern African Savanna
… the complex couplings and feedbacks that drive spatiotemporal patterns of change are lacking. In Chapter 1 of my dissertation, I discuss some of the different theoretical frameworks used to understand complex and dynamic changes in savanna structure and composition. In Chapter 2, I evaluate …
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Spatiotemporal patterns in the distribution and abundance of the introduced Redbreast Sunfish (Lepomis auritus) and native Longear Sunfish (L. megalotis; Centrarchidae) in reservoirs of the Tennessee River drainage
… This study aimed to characterize temporal patterns in regional abundances of L. auritus and L. megalotis populations in the TRD based on a multiyear analysis of historical and contemporary fish assemblage datasets (percent abundance, density, biomass). Results indicate that L. megalotis …
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Two problems about coupled oscillators: transient dynamics and swarming
… the coaction of these two effects produces novel spatiotemporal patterns, which we study both analytically and numerically.
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Modelling the Transmission of Dengue Fever Based on Spatial and Temporal Patterns
… host, and vector interactions result in complex spatiotemporal patterns in dengue disease. Moreover, it has been previously indicated that the dengue fever epidemic is due to several climatic, social, environmental, and biological factors, and these factors vary from place to place and with time. …
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A study of synchronization of nonlinear oscillators: Application to epileptic seizures
… in the rat neocortex. In the experimental part, spatiotemporal patterns of electrical activities in the rat neocortex are measured using voltage-sensitive dye imaging. Epileptic regions show well-synchronized, in-phase activity during epileptic seizures. In the computational part, a network of a …
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Observations and mechanistic modelling of the role of Aedes mosquitoes in dengue transmission in Singapore
… the role of Aedes mosquitoes in shaping the spatiotemporal patterns of dengue transmission in Singapore is investigated. Field surveys are carried out to study the effect of monsoons on the disease vectors; the impact of urban housing on spatial patterns of dengue transmission is explored; …
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Population Dynamics and Pattern Formation in an Info-chemical Mediated Tri-trophic Plankton Model
… We also consider under what conditions Turing patterns are exhibited and under what conditions spatiotemporal patterns are observed generally. The Transient Turing instability of spatial interactions –exhibited by the two species model–is introduced and investigated in a number of ways. We also …
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Bayesian hierarchical approaches to analyze spatiotemporal dynamics of fish populations
The study of spatiotemporal dynamics of fish populations is important for both stock assessment and fishery management. I explored the impacts of environmental and anthropogenic factors on spatiotemporal patterns of fish populations, and contributed to stock assessment and management by …
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DEVELOPMENT OF SPATIOTEMPORAL CONGESTION PATTERN OBSERVATION MODEL USING HISTORICAL AND NEAR REAL TIME DATA
… an approach to effectively identifying spatiotemporal patterns of traffic congestion at a network level. The Metro Atlanta highway network was used as a case study. Real time traffic data was acquired from the Georgia Department of Transportation (GDOT) Navigator system. For a …
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Nonlinear Nonlocal Parabolic-Hyperbolic Coupled Systems for Cancer Cell Movement and Aggregation
… numerically, and we demostrate a wide range of spatiotemporal patterns. We investigate the effect of mutation and TGF-β concentration on the speed on cancer spread, as well as the effect of nonlocal interactions on cancer cells' speed and turning behaviour.
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Mnemonic information in the rodent hippocampus during wake and sleep states
… role in memory processing. We report that spatiotemporal patterns of activity - reflecting tens of seconds to minutes of behavioral experience - are reproduced during REM episodes at a roughly equivalent timescale. Furthermore, within such REM episodes behavior-dependent modulation of the …
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Optogenetic control of developmental signaling pathways
… facilitate proper development. Understanding the spatiotemporal intricacies of these pathways necessitates tools which enable their perturbation in precisely defined spatiotemporal patterns. Optogenetics uses light-induced conformational changes to enable or disable protein-protein interactions, …
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Data-intensive spatial pattern discovery based on generalized spatial point representations
… questions: how to estimate the spatial and spatiotemporal patterns of geographic phenomena from geospatial big data based on spatial point models? How to compare these patterns to gain insights into complex geographic phenomena? How to estimate the computational intensity of the methods? How …
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Complex network analysis of extreme precipitations in North America
… resources depends on identifying the complex patterns of extreme precipitation events (EPEs). In this regard, we studied EPEs in North America using complex network analysis. We generated the EPEs network from the gauge-based daily precipitation dataset from the Climate Prediction Center …
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High-resolution soil moisture mapping by a proximal ground penetrating radar: A numerical, laboratory and field evaluation
… GPR method permitted to characterize the spatiotemporal patterns of soil moisture in an agricultural field and to investigate their temporal stability. Locations showing temporal stability of field-average soil moisture could be revealed. Lastly, the effect of the spatial variability of …
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