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 73 for “"Density Dependence"”.
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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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Nonsmooth Bifurcations and the Role of Density Dependence in a Chaotic Infectious Disease Model
… bifurcations for alternate functional forms for density dependence in the growth function of a given model. These demonstrate interesting structures and chaotic behaviors with biologically feasible interpretations such as intrinsic growth rate and probability of death. The choice of density …
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Dispersal of Fry and Distribution of Redds Interact to Shape Density Dependence in Winter Steelhead of the Skagit River
… within 312m of their natal redd. Evidence of density-dependent dispersal was found at sites with multiple redds, where mean displacement increased to 270 m, though individual kernel tails could not be resolved. This limited dispersal resulted in strong spatial clustering of fry in areas with …
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Population Demographics of Cougars in the Black Hills: Survival, Dispersal, Morphometry, Genetic Structure, and Associated Interactions with Density Dependence
… assess population status and document effects of density dependence as they relate to overall population demographics of the cougar population in the Black Hills. Cougars were captured and fitted with radio-transmitters to assess these objectives as well as acquiring ancillary data through …
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Adaptation in a Changing World: Evolutionary mechanisms of salt tolerance in a coastal amphibian
… that influence likelihoods of evolution (e.g., density dependence, phenotypic plasticity). Chapter 1 used field surveys, meta-analysis, and common garden experiments to show that Hyla cinerea are unique among frog species in their ability to inhabit saline wetlands. Coastal H. cinerea laid more …
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Density Effects on Growth, Survival and Diet of June sucker (Chasmistes liorus): A Component Allee Effect in an Endangered Species.
Density-dependence is considered one of the most important regulators of population growth, and it has been documented across a wide variety of species. Typically, population growth rate and components thereof decline with increasing density (i.e., negative density-dependence); however, in species …
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Muon regeneration in muon catalyzed dt-fusion
The origin of the experimentally observed density dependence of the effective muon alpha sticking fraction will in muon catalyzed deuterium- tritium fusion has been comprehensively reanalyzed with the particular emphasis put on the density dependence of the stopping power in dense hydrogen. The …
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Dynamique des populations de caribous migrateurs (Rangifer tarandus) basée sur des indices de condition corporelle
… and conservation. High population size or density can negatively affect demographic parameters including reproduction, recruitment and survival. These parameters are intricately linked to individual body size and condition. Migratory caribou ( Rangifer tarandus ) are a keystone species in …
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The Impact of Neighborhood-Based Processes on Demography and a Decline in Species Diversity in a Temperate Deciduous Forest
… the maintenance of species diversity, including density-dependence, interspecific competition, and disturbance, should be able to elucidate not only the causes of the maintenance of species diversity, but also its decline. This study investigated how these three processes contributed to a decline …
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High Pressure Light Scattering Studies of Dense Fluids (Collision, Induced, Lineshape)
… experiments are a powerful tool for probing the density dependence of both molecular motion and intermolecular interactions. This thesis describes high pressure light scattering studies of the vibrational relaxation of the nitrate ion in aqueous solutions of sodium nitrate and of collision …
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Migratory Behavior and Survival of Adult Female Elk in a Partially Migratory Population
… both resident and migratory characteristics, and density-dependent switching such that at higher winter densities, elk switched from resident to migrant, whereas at lower densities, elk reversed direction. This evidence for flexibility in migration supports the idea of behavioral plasticity in …
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Migratory Behavior and Survival of Adult Female Elk in a Partially Migratory Population
… both resident and migratory characteristics, and density-dependent switching such that at higher winter densities, elk switched from resident to migrant, whereas at lower densities, elk reversed direction. This evidence for flexibility in migration supports the idea of behavioral plasticity in …
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High Pressure NMR Studies of Supercooled Viscous Fluids
… and toluene. It was shown that the nature of the density dependence of $\kappa$ for isopropylbenzene-d$\sb1$ is the same as the density dependence of $\kappa$ for isopropylbenzene-d$\sb5$. However, toluene represents a transition between molecules with no axis of unhindered reorientation like …
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The general continuum model for structured populations, with two case studies in plant ecology
… all possible combinations of three types of size dependence in somatic growth and mortality is formulated. Qualitative parameter estimation for the various models yields size distributions that can be classified into the following biologically meaningful groups: group (i) has no models that use …
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Depolarized Light Scattering Studies of the Orientational Structure of Liquid Benzene, Dipole-Induced Dipole Models for Molecular Polarizabilities, and the Cotton-Mouton Effect
… ratio (tau)(,LS)/(tau)(,SP) has no observable density dependence and increases slightly with increasing temperature. The dependence of (tau)(,LS) on the viscosity of the liquid is also examined and found to agree qualitatively with the Debye equation.
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Community- and species-level consequences of competition in an unproductive environment: an experimental approach using boreal forest understory vegetation
… plants. The second study used the Community Density Series (CDS) methodology. The first of these was a 10-speciesexperimental community established from seed and grown in sandboxes at 6 densities with 2 watering levels and 2 fertilizer levels in a factorial design. At the community level, …
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Cooperative Optical Non-linearity in a blockaded Rydberg Ensemble
… characterised as a function of probe power and density for both attractive and repulsive interactions, demonstrating a non-linear density dependence associated with cooperativity. For the case of repulsive interactions, excellent agreement is obtained at low densities between experimental data …
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Population dynamics in meerkats, Suricata suricatta
… Notably, groups 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 …
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An Equation of State with the Complete SU(3)f Baryon Octet for Neutron Star Mergers
Above 2–3 times saturation density (n0), the neutron star equation of state (EoS) is predicted to contain strange quarks, but it is difficult to model the strange degrees of freedom in a way that correctly predicts a maximum neutron star mass in excess of the heaviest known neutron stars, such as …
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Resource competition and soft selection in Sabatia angularis
… where individual fitness is a function of the density and genetic composition of competitors, selection is considered ‘soft’. The extent to which soft selection occurs in natural populations remains an open question and a critical one, given it can explain phenomena such as the maintenance of …
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