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 197 for “"density-dependent"”.
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Density-Dependent Foraging in Caenorhabditis Elegans
<p>Game theory has long predicted that the density of competitors and their behaviors should affect foraging, and moreover suggests that multiple strategies can evolve and co-exist within a single species. I show that both of these predictions are met by foraging Caenorhabditis elegans. In Chapter …
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A Discrete Density-Dependent Model of the Solanum Virus
… the contiguous United States. Frequency dependent and density dependent transmission will be discussed, and density dependent transmission will be shown to be the appropriate choice for this model. Constant parameters, such as birth rate, bite rate, death rate, and turning rate will be …
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Two-patch herbivore/vegetation models with density-dependent migration
… using the metaphysiological approach and a density-dependent migrations. In the first model we considered the case when the environment is constant, and we constructed a system of four perturbed ordinary differential equations describing the dynamics when only herbivores allowed to move …
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Determining the role of density-dependent effects in disease induced population impacts
… at low host densities to be effective. Density-dependent contact rates are generally assumed to be the mechanism driving these decline patterns. However, other density-dependent processes that influence transmission probability could also influence mortality in a density-dependent …
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Strain rate and density dependent behaviour of bovine cancellous bone in compression
… modulus as a function of both strain rate and density were investigated. Results show that, as expected, density has a far greater effect on the mechanical properties of cancellous bone than strain rate. Due to the high scatter in results, the exact relationships are difficult to determine, …
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A quantitative model of density-dependent habitat selection: integrating isodar and isoleg theories
… conceptual models have been advanced to explain density-dependent habitat selection, but few models address multiple species interactions and even fewer simulate these phenomena. Moreover, the development of quantitative models that incorporate multiple species interactions is in its infancy with …
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The importance of density-dependent mechanisms in determining cohort survival in largemouth bass
… explore mechanisms of recruitment, because both density-dependent and independent processes have been identified as important in regulating populations. Timing of hatching can influence growth and survival of largemouth bass. Individuals hatched relatively early have a period of growth prior to …
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A test of the variable nature of density-dependent mortality in fish populations
… in power-plant cooling systems was questioned. Density-dependent dynamics were hypothesized as variable, not constant, making previous analyses based on constant density-dependent or density-independent mortality in error. This hypothesis was tested with a simulation model based on complex …
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Normal Mode Analysis Of Single Bunch, Charge Density Dependent Behavior In Electron/Positron Beams
… science in coming years will be increasingly dependent upon high singlebunch charges and/or small emittances. Under these conditions, single-particle dynamics are not a sufficient description of beam behavior and interactions between the beam particles must be taken into account. One such …
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A novel algorithm for creating density dependent, coarse-grained models for the simulation of surfactant systems
… studies of proteins and colloids where the local density can vary considerably. This work examines implicit solvent potentials within a more general coarse-graining framework. While a pairwise potential between solute sites is relatively simple and ubiquitous, an additional parameterization based …
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White storks (Ciconia ciconia) of Eastern Germany: age-dependent breeding ability, and age- and density-dependent effects on dispersal behavior
… be determined by the age of the individual. Age-dependent as well as density-dependent dispersal patterns are common in many bird species. In this thesis, I first present age-dependent breeding ability and natal site fidelity in white storks (Ciconia ciconia); migratory birds breeding in large …
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A comparison of individual-based and matrix projection models to applied to fish population and community dynamics
… interactions with walleye. I created density-dependent and stochastic age-structured and stage-within-age matrix models from an Oneida Lake walleye-yellow perch IBM, and then changed perch survival rates within the matrix models and IBM and compared their predicted responses. The …
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Non-Linear Density Dependence in a Stochastic Wild Turkey Harvest Model
… gallopavo silvestris</I>) harvest models assume density-independent population dynamics despite indications that populations are subject to a form of density dependence. I suggest that both density-dependent and independent factors operate simultaneously on wild turkey populations, where the …
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On the economic optimality of marine reserves when fishing damages habitat
… between individuals, thereby increasing density-dependent mortality rates. I then optimize effort distribution and fish stock density according to three management cases: (1) a sole owner, with jurisdiction over the entire fishery, who seeks to maximize profit by optimizing effort …
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On the economic optimality of marine reserves when fishing damages habitat
… between individuals, thereby increasing density-dependent mortality rates. I then optimize effort distribution and fish stock density according to three management cases: (1) a sole owner, with jurisdiction over the entire fishery, who seeks to maximize profit by optimizing effort …
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Investigation of quorum sensing process in Bacillus licheniformis
… and some fungal, populations. This cell density dependent phenomenon is based on the accumulation of small diffusible molecules, termed as quorum sensing molecules, in the extracellular milieu until a threshold concentration triggers alteration in the expression of specific genes …
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Simulating the evolution of recruitment behavior in foraging Ants
… pheromone trails selectively, depending on the density of other food available in the area where food was found. We found that the density-dependent trail-laying model fit the field data better. We found that in this density-dependent recruitment model, colonies of all sizes evolved intense …
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Modeling Effects of Mortality on Indiana Bat (Myotis Sodalis) Populations at Wind Energy Facilities
… incorporating mortality and carrying capacities. Density-independent, density-dependent fecundity and density-dependent survival Leslie matrix models were developed and run. Results suggest that, depending on the model used, and the method by which mortality is incorporated, the effect of …
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Molecular, Genetic and Physiological Studies on the Regulation of Conjugal Transfer of the Ti Plasmid pTiC58 by Agrobacterium Tumefaciens
… determined that the bacteria mate in a cell density dependent manner, known as quorum-sensing. Analysis of transfer frequencies using a transfer-constitutive mutant of pTiC58 showed that quorum sensing requires both the opine induction and autoinduction systems. Analysis of lacZ fusions …
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