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 8 of 8 for “"predator-prey system"”.
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The effects of mass extinction on escalation of the naticid gastropod predator-prey system at the Eocene-Oligocene
… preferentially eliminate the highly escalated prey and, therefore, a new cycle would be initiated. </p><p> In this study the Kelley-Hansen hypothesis was tested at the Eocene Oligocene extinction boundary in central Mississippi. The levels of escalation of specimens from the Moodys Branch …
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Predator-prey behavioural interactions on plants, with special emphasis on aphid dropping defence and ladybird search strategies
Predator-prey interactions have significant short- and long-term implications for the individuals involved, their populations’ dynamics, and the broader ecological community. Predation is a strong selective force that has led to prey evolving a great diversity of defensive adaptations, while …
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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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Modeling population dynamics of rhino-poacher interaction across South Africa and the Kruger National Park using ordinary differential equations
In this thesis, a system of ordinary differential equations (ODES) is presented to model the population dynamics between poachers and rhino as a predator-prey system in both South Africa (SA) and the Kruger National Park (KNP). The data used in this thesis consists mainly of government and police …
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Stochastic modelling of nutrient and predator-prey populations
… the stochastic versions of the foraging arena predator-prey system. The impacts of different types of environmental noise on the population dynamics are deduced. First of all, the SDE predator-prey model is formulated by incorporating white noise into the deterministic foraging arena system …
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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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Ecological responses by Mexican spotted owls to environmental variation in the Sacramento Mountains, New Mexico
… that maintain or increase availability of prey species. A primary purpose of this investigation was to evaluate the hypothesis that Mexican spotted owls (Strix occidentalis lucida) could be conserved by manipulating microhabitat conditions that increased abundance of one or more common prey …
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Modelling foraging behaviour in the insect predator Notonecta maculata using the individuals approach
… of juvenile backswimmers changes with predator instar. Therefore, ecological parameters that were considered influential in prey selection were quantified experimentally and subsequently led to the parameterization of an individuals model to be used for the prediction of predation …