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 874 for “"predator"”.
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Predator recognition and anti-predator behavior in juvenile Asian carp
… many prey fishes. Chemical, social, and similar predator cues may all inform an individual of a possible impending predatory threat. Bighead (Hypophthalmichthys nobilis) and silver carp (H. molitrix) widespread invasive fishes, and can be vulnerable to predation during their first year. Because …
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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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Epistasis in Predator-Prey Relationships
… 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 if epistasis results in an undesirable or …
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Biogeographic Patterns, Predator Identity, and Chemical Signals Influence the Occurrence and Magnitude of Non-lethal Predator Effects
Predators can have large effects on prey populations and on the structure and function of communities. In addition to direct consumption of prey, predators often cause prey to alter their foraging behavior, habitat selection, and morphology. These non-lethal effects of predators can propagate to …
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Variation in predator communities and anti-predator behaviors of Milne-Edwards' sifakas (Propithecus edwardsi) in southeastern Madagascar
… human-disturbed habitats. I investigated lemur-predator interactions in southeastern Madagascar through a comparison of predator communities and anti-predator behaviors of Milne-Edwards' sifakas (Propithecus edwardsi) in the continuous rainforest of Ranomafana National Park, and the forest …
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Anti-Predator Responses of Squid Throughout Ontogeny
… behaviors have evolved as components of anti-predator responses in squids. The goals of this study include: (1) examine the role of the lateral line analogue and vision in successful predator evasion; (2) measure kinematics of escape jetting; (3) document how chromatic patterning, posturing …
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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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Crayfish: Scavenger or deadly predator? Examining a potential predator-prey relationship between crayfish and benthic fish in aquatic food webs
… carnivores, but studying crayfish as a potential predator of benthic fish in lotic systems, where they co-occur, has yet to be addressed. Competition exists between crayfish and Percid benthic fish in Illinois streams, for food resources and refuge from larger predators. Previous research, though, …
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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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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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Estimation of Predator Densities in Western South Dakota
Evaluation of methods for predator density estimation is necessary to assess biases in techniques and determine those best suited to local conditions. Knowledge of predator populations allow wildlife managers to prescribe and assess management and control activities. Objectives of this study were …
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Predator Recognition Learning in Rainbow Darters (Etheostoma Caeruleum)
… could learn to associate cues from an unfamiliar predator with a known fright stimulus (darter alarm cues) through the process of classical conditioning. Darters in the experimental group (n=32) were trained using their alarm cues paired with cues from larval ringed salamanders (unfamiliar …
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Preying on the predator : the shark fin controversy
The consumption of shark fin soup dates back to the Ming Dynasty in China, when it was served to emperors. Today, the cultural delicacy represents wealth, status, and power. Over the past 30 years, with the rising middle class in China, the demand for shark fins has surged. To address the …
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Predator Recognition and Avoidance in the San Marcos Salamander
Selection by predators is among the most important forces acting on prey populations. To persist with predators, prey must be able to recognize and respond to predatory threats. Despite the benefits of avoidance, there are time allocation tradeoffs with foraging and mating that make excessive …
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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
… 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
Mechanisms associated with habitat choice in fish are often unknown, and require exploration of many different abiotic and biotic habitat features. The importance of finding these drivers lies in helping to explain population variation. Saugeye Sander vitreum ¿ X S. canadense ¿ are stocked with …
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Modelling the krill-predator dynamics of the Antarctic ecosystem
… objective of this thesis is to model the krill-predator dynamics of the Antarctic ecosystem so as to determine whether predator-prey interactions alone can broadly explain observed population trends of the species considered in the model without any appeal to systematic effects possibly caused …
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Consensus, Cooperative Learning, and Flocking for Multi-agent Predator Avoidance
… related to defending or escaping from predators. In this thesis a hybrid multi-agent system that integrates consensus, cooperative learning, and flocking control to determine the direction of attacking predators and learn to flock away from them in a coordinated manner is proposed. This …
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