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 11 of 11 for “"Predator-Prey Systems"”.
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Pattern formations and relaxation dynamics in non-equilibrium systems
… present an investigation of two non-equilibrium systems: spatial many-species predator-prey games and systems of interacting magnetic skyrmions. We numerically study two predator-prey systems characterized by nested pattern formations. We first consider a six species game in which spiral patterns …
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Robust computational methods to simulate slow-fast dynamical systems governed by predator-prey models
… this work are singularly perturbed (slow-fast) predator-prey systems which are characterized by the presence of a very small positive parameter representing the separation of time-scales between the fast and slow dynamics. Solution of such problems involve multiple scale phenomenon characterized …
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Phenotypic plasticity from a predator perspective: empirical and theoretical investigations
Phenotypic plasticity is common in predator-prey interactions. Prey use inducible defenses to increase their chances of survival in periods of high predation risk. Predators, in turn, display inducible offenses (trophic polyphenisms) and adjust their phenotypes to the prevailing type of prey. In …
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Models of aposematism and the role of aversive learning
The majority of species are under predatory risk in their natural habitat and targeted by predators as part of the food web. Through the process of evolution by natural selection manifold mechanisms have emerged to avoid predation. As Fisher argued, it is the ubiquitous presence of anti-predator …
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Predator Behavior and Prey Demography in Patchy Habitats
… The effect of habitat loss and fragmentation on predator-prey systems has received extensive theoretical attention, but empirical studies of these systems yield few clear patterns. I examined the influence of prey abundance and spatial distribution on the foraging ecology and spatial ecology of …
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Scavenger-Predator-Prey Model with Finite Resources
… of adaptive behaviors in ecological systems. The thesis is composed of three interconnected works, each delving into the dynamics of predator-prey-scavenger interactions. The first segment of the thesis investigates the role of predator-taxis in pattern formation within predator-prey …
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Describing and forecasting patient census: Comparing linear and nonlinear analysis results
… assumptions of linearity. Yet hospitals are open systems, in continuous interaction with the environment. As such, they are nonlinear phenomena. Chaos theory offers methods for analyzing and modeling nonlinear phenomena. Scientists applying chaos theory to management agree that nonlinear analysis …
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The effects of white shark presence on the behaviour of Cape fur seals at Geyser Rock, Gansbaai, South Africa
Predators and the risk associated with their presence may affect group composition, group size, movement patterns, and habitat use of prey species. The removal of predators, or their reintroduction following long periods of absence, equally can have profound impacts on their prey, triggering …
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Relaxation and Spontaneous Ordering in Systems with Competition
Spontaneous order happens in non-equilibrium systems composed of interacting elements. This phenomenon manifests in both the formation of space-time patterns in reaction-diffusion systems and collective rhythmic behaviors in coupled oscillators. In this thesis, we present the results of two …
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Seguimiento y gestión de sistemas depredadores-presa : aplicación a la conservación de fauna amenazada
… process that tends to regulate the abundance of prey species and their main predators. However, human intervention can lead to risks for both predators and prey. Today, the problems facing the proper management of predator-prey systems are numerous, especially in hunting and conservation areas. …
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Movement analysis for monitoring predation by large carnivores : lions in Kruger National Park
Methods used to estimate the prey consumption by large carnivores include direct continuous observation, stomach content analysis, carcass observations and scat analysis. Continual observations are widely considered the best approach to estimate large carnivore diets, with lions (Panthera leo) …