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 1240 for “"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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Scalable High-Resolution Simulation of the Prey-Predator Model, with a Non-Local Consumption of Prey
… simulation framework for a reaction diffusion prey-predator model with finite hunting ranges. The model’s integral predation term produces stiff, non-local dynamics that present a challenge to traditional explicit or fully implicit solvers. This study overcome this barrier by incorporating a …
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Venom Expelled by Cottonmouths (Agkistrodon Piscivorus) Across Different Prey Sizes, Prey Taxa, and Snake Body Temperatures
… system enabling them to efficiently disable prey. To avoid retaliatory countermeasures, pit vipers typically release envenomated prey which are then trailed and consumed after succumbing to venom effects. Successful retrieval of released prey should vary with venom resistance and trail …
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Oystercatchers and cockles : a predatory-prey study
… both flesh content and size were correlated with prey density. The profitability (flesh eaten per minute handling time) of cockles increased with their size. According to optimal foraging theory, these larger ones should therefore have been preferred, and this proved to be so. The rate at which …
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Fox-Prey Relationships in Eastern South Dakota
… red foxes (Vulpes fulva) end their principal prey, particularly ring-necked pheasants (Phasianus colchicus), were studied on four units in eastern South Dakota from December 1964 to September 1966. Each unit was composed of a 100-square-mile "reduction area," on which fox populations were …
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Scavenger-Predator-Prey Model with Finite Resources
… 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 predator-taxis …
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Interacting populations : hosts and pathogens, prey and predators
… the expense of the other. Predators kill their prey instantly and use it only for food, whereas parasites use their hosts both as their habitat and their food. I am particularly interested in microbial parasites (including bacteria, fungi, viri, and some protozoans) since they cause many …
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Predator Behavior and Prey Demography in Patchy Habitats
… 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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Stochastic modelling of nutrient and predator-prey populations
… 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 using the …
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Interacting populations : hosts and pathogens, prey and predators
… the expense of the other. Predators kill their prey instantly and use it only for food, whereas parasites use their hosts both as their habitat and their food. I am particularly interested in microbial parasites (including bacteria, fungi, viri, and some protozoans) since they cause many …
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The importance of predator behaviour on risk to prey
Both predator and prey have evolved to maximise reproductive success by balancing food intake with risk. There has been a bias in predator-prey studies, where prey behaviour has been examined in detail, yet predators are assumed to follow simplistic rules. I use three-spined sticklebacks predating …
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Sir epidemic and predator - prey models of fractional-order
… 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 sub-optimal …
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Stochastic modeling of Karlotoxin's influence on prey
… Karlotoxin. This toxin is known to affect their prey's bio-locomotion by stunning them and slowing them down. In this dissertation, we investigate whether the toxin plays a crucial role in aggregating the prey around the predators. The effect of aggregating prey around the predators is …
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Effects of fractional time derivatives in predator-prey models
… 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 observable domains …
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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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The Effects of Odonates on a Littoral Prey Community
… of MIllers's Marsh, each containing a natural prey community and absence or presence of dragonfly or damselfly larvae. Prey organisms were sampled with duplicated samples once a week. Statistical analyses indicated a lack of significant predator effects on both the the density and population …
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Predators vs. Prey: The information ecology of warning signals
… work has assumed that predators need to sample prey individually (personal information) to learn about these defences, however recent research suggests that observing predation events of others (social information) may also shape selection for prey defences and help resolve this puzzle. Here I …
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TROPHIC ECOLOGY OF SAILFISH LARVAE IN THE GULF OF MEXICO: AN ANALYSIS OF DIET, PREY AVAILABILITY, PREY QUALITY, AND INFLUENCES ON LARVAL GROWTH
… was compared to environmental, spatial, diet, prey availability, and fatty acid metrics using data collected from near-surface waters in the northern Gulf of Mexico (2017 - 2019). Larvae exhibited a highly selective feeding strategy in early development and expanded their feeding niche to …
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