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 10 of 10 for “"Allee effect"”.
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Density Effects on Growth, Survival and Diet of June sucker (Chasmistes liorus): A Component Allee Effect in an Endangered Species.
… behavior, positive density-dependence (i.e., Allee effect) may occur at low density. June sucker, a federally endangered lake sucker endemic to Utah Lake, Utah, USA, occurred historically at high density, and it exhibits coordinated feeding behavior. These characteristics indicate a potential …
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Allee effects and the persistence of small populations
… two-fold. Firstly, to examine the role of the Allee effect in the establishment success of insect pest populations during the early phases of invasion. Secondly, to examine how spatial management at the point of introduction could render populations more vulnerable to the Allee effect and …
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Dynamics in Discrete Time: Successional Communities, Spatial Models, and Allee Effects
… where the climax population is subject to an Allee effect. Each population is subject to inter- and intraspecific competition; population growth is dependent on the combined densities of both species. I fully characterize the long-term dynamics of the model, uncovering diverse sets of …
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Rate-induced tipping in a moving habitat
… growth at low population densities, known as the Allee effect. The spatial distribution of the populations are computed as standing wave solutions in the static habitat and travelling pulse solutions in the moving habitat, drifting at a constant habitat speed. A critical habitat speed is found for …
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Population dynamics in meerkats, Suricata suricatta
… may be subject to inverse density dependence (Allee effects) that result from a dependence on conspecific helpers, but evidence for population-wide Allee effects is rare. To develop a mechanistic understanding of population dynamics in highly social species, we need to investigate how processes …
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Modeling population dynamics of rhino-poacher interaction across South Africa and the Kruger National Park using ordinary differential equations
… to include both a carrying capacity and the Allee effect. This thesis parameterises a model of the dynamics of the interaction between rhino and poachers for some time t and makes predictions based on the interpolation of the available data. The unknown rates and parameters relating to the …
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Population oscillations, synchronization, and range expansion in a bacterial cross-protection mutualism
… that range expansion of populations with an Allee effect (when average individual fitness increases with population size or density) in these conditions can exhibit pinning (inability to expand at low dispersal rates) and pulsed expansion (periodic or step-like expansion into new territory). …
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Spatial dynamics modeling for data-poor species using examples of longline seabird bycatch and endangered white abalone
… strategies. The model allowed for the Allee effect (i.e., density-dependent fertilization success) by using spatial explicit density estimates. Restoration efforts directed at larger-size individuals may be more effective in increasing population density than efforts focusing on …
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Modelling Allee effects in a transgenic mosquito population during range expansion
… into new areas, they may undergo mate-finding Allee effects such that their ability to successfully reproduce becomes difficult at low population densities. With new technology, creating target specific gene modification may now be a viable method for mosquito population control. We develop a …