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 20 of 202 for “"predator-prey"”.
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Epistasis in Predator-Prey Relationships
… a single phenotype. We model epistasis of the prey in a two-locus two-allele problem in a basic predator- prey relationship. The resulting model allows us to examine both population sizes as well as genotypic and phenotypic frequencies. In the context of several numerical examples, we show that …
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Scavenger-Predator-Prey Model with Finite Resources
… 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 systems, as documented in the paper ”Generalized Holling III Functional Response: role of …
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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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Sir epidemic and predator - prey models of fractional-order
… focus of this report is to extend the model of a predator-prey and the SIR epidemic models to fractional model. More specifically, the fractional predator-prey model which depend on the availability of a biotic resources was discussed. On the other hand, fractional SIR epidemic model with …
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Effects of fractional time derivatives in predator-prey models
… with the effects of fractional derivatives in predator-prey like systems, including models of plant water interaction. In Chapter 3, a fractional order predator-prey model is introduced, and we show how fractional derivative order can change the system from monostable to bistable. The …
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Habitat Mapping and Predator-Prey Dynamics in Ohio Resevoirs
… explicit information about temperature, prey availability, depth, slope, and substrate to predict saugeye habitat use. Using telemetry we mapped saugeye locations to assess factors that influence saugeye habitat use. Saugeye were tagged with a radio tag for location. Hydroacoustics were …
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Predator-prey Interactions of Fishes in Two Nebraska Sandhill Lakes
… density (PSD). However, direct assessment of predator effects on panfish populations is still needed. The objective of my study was to determine seasonal food habits of bluegill, yellow perch, largemouth bass, and northern pike in Pelican and West Long lakes, Nebraska, in 2001. Although …
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Optimal harvesting theory for predator-prey metapopulations / Asep K. Supriatna.
… addressing the question of how to harvest a predator-prey metapopulation. Optimal harvesting strategies are found using dynamic programming and Lagrange multipliers. Rules about harvesting source/sink populations, more/less vulnerable prey subpopulations and more/less efficient predator …
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Predator-prey interactions involving the soybean aphid (Hemiptera: Aphididae) in Missouri
… fields in Missouri. We hypothesized that a predator complex suppresses soybean aphid populations in Missouri prior to reaching economic threshold and that this complex can easily be disturbed by insecticide applications. To determine which predator is most responsible for suppressing aphid …
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The Role of Predator-Prey Relationships in The Nidality of Leptospirosis
Made available in DSpace on 2014-12-09T22:30:09Z (GMT). No. of bitstreams: 1 6607795.pdf: 13358756 bytes, checksum: 7a03b97cbd1a90d86f139547e5b6c322 (MD5) Previous issue date: 1966
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Modeling for microbial communities with cross-feeding and predator-prey interactions
… diverse ways, such as resource competition and predator-prey interactions. In ecology, mathematical models have been proved effective in simulating diverse interactions and studying the stability of ecosystems under different interacting patterns and strengths. However, such a community-level …
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Theoretical Impacts of Habitat Loss and Generalist Predation on Predator-Prey Cycles
Certain herbivores and their predators undergo high amplitude periodic fluctuations in abundance in northern latitudes but exhibit damped cyclic dynamics in their respective southern ranges. Generalist predation and habitat loss have been identified as two features of southern habitats that may …
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EFFECTS OF ABIOTIC STRESS AND PREDATOR REFUGE ON TERRESTRIAL PREDATOR-PREY INTERACTIONS
… reduces the importance of predation because predators are more vulnerable to stress than prey, but this hypothesis has not been well-tested in terrestrial systems. The effect of refuge from stress on predation level has been studied even less, particularly in terrestrial systems. My research …
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Interpreting Predator – Prey Interactions in Cayuga Lake Fishes Using Fatty Acid Signature Analysis
Fatty acids are transferred from prey to predator and can be used to assess trophic interactions in aquatic food webs. Therefore, to better understand Cayuga Lake food web dynamics, fatty acid signatures (FAS) of lake trout (Salvelinus namaycush) were compared to two major prey species in the lake; …
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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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Gizzard Shad Reproductive Biology and Predator-Prey Relations with Walleyes in Western South Dakota Reservoirs
… the 1990s to potentially provide increased prey resources for walleye Sander vitreus. The objectives of this study were to assess gizzard shad reproductive biology and determine the extent to which gizzard shad contribute to the walleye prey base at this northern latitude. Adult gizzard shad …
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Habitat, landscape, and climate effects on riparian predator-prey interactions in a human-dominated ecosystem
Predator-prey interactions form ecologically significant links between terrestrial and aquatic ecosystems, and may be particularly important in riparian ecosystems with highly variable habitat features in human-dominated landscapes. Climate models predict an increased frequency of summer drought …
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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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