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 25 for “"competitive exclusion"”.
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Geomechanical impact of bio-competitive exclusion chemical on reservoir rocks.
… study describes a novel approach known as "bio-competitive exclusion", which uses chemical nitrates as an oilfield chemical to treat reservoir souring and control the activities of sulfate-reducing bacteria. Because of its flexibility and extensive use in oil production, this oilfield treatment …
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Competition among simulated plant species in a toy local vegetation model
… competition for resources, which often leads to competitive exclusion and thus to low diversity of plant types. Here we sought to revisit Kleidon and Mooney’s study by simplifying their modelling approach in a local mid-latitude temperate environment but including explicit competition for water. …
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Mathematical models in evolutionary dynamics
… of model. The second model is an extension of a competitive exclusion model studied by DeVille et. al. We again consider both a mean field deterministic approach and a weak noise stochastic approach, this time with the focus on the former where we are able to prove numerous global stability …
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Population dynamics: general results from local analysis
… it is shown that the strong form of the famous competitive-exclusion principle only occurs because of certain degeneracies that exist in simple ecological models.
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Plant-Soil Feedback and Perennial Forage Systems
… to leverage PSF benefits while mitigating competitive exclusion.
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Effect of container size and larval competition on adult fitness of Aedes aegypti and Aedes albopictus (Diptera: Culicidae)
… may help account for the observed patterns of competitive exclusion and coexistence seen in the field for Ae. aegypti and Ae. albopictus.
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The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… in situations that would otherwise lead to competitive exclusion. When implemented in a size-structured NPZ model, stronger switching increases the evenness of the distribution of biomass between coexisting size classes, which is used as a proxy for taxonomic diversity. I also describe a …
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Linking microbes and climate : insights into the marine oxygen and nitrogen cycles with microbial metabolic functional types
… Resource ratio theory is used to explain the competitive exclusion of anaerobic metabolisms in oxygenated environments as well as the stable coexistence of aerobic and anaerobic metabolisms when oxygen is limiting. The onset of this coexistence is a function of the relative availability of …
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Biological and Ecological Trait Associations and Analysis of Spatial and Intraspecific Variation in Fish Traits
… studies. Lower resource competition, and / or competitive exclusion of fishes with similar niche requirements are possible mechanisms. All three objectives support understanding of trait association and variability as a useful foundation in ecological applications and for formulating plans for …
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Spatial, temporal and within-species variation in the foraging ecology of a marine predator across a dynamic seascape
… patches than their larger conspecifics due to competitive exclusion. Overall, these findings highlight the foraging plasticity of ringed seals to changing environmental conditions and resource availability.
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Assessing risk to native ecosystems: using exotic ants as a model
… observations to determine whether ants may be competitively excluding important pollinators. I found trophic position varied between native and invasive ant species; although two invasive species represented the two lowest trophic positions, most other species reflected trophic positions …
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The Effect of Habitat Fragmentation on Forest Mammals: An Experimental Analysis of Three Squirrel Distributions in the Agricultural Landscape of East Central Illinois
… absences were due to poor habitat suitability or competitive exclusion by resident fox squirrels. Radio-telemetry data from juvenile females of both species that were released into the agricultural landscape demonstrated that fox squirrels have superior dispersal ability, as fox squirrels moved …
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Trait-based approaches to marine microbial ecology
… variability of the environment led to the competitive exclusion of phytoplankton with slower growth rates and to lower diversity. The relatively weak seasonality of the stable subtropical and tropical oceans in the global model enabled long exclusion timescales and prolonged coexistence of …
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Listeria monocytogenes in the mushroom production environment: biofilm formation and control measures
… utilised as a biocontrol agent in the form of a competitive exclusion organism against L. monocytogenes. However, in a similar pattern to the biocidal products, this efficacy did not translate well in pilot-scale trials as it was found to be ineffective when applied during a standard mushroom …
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In vitro model development for novel prevention measures against foodborne pathogens
… adhesion has not been well characterized as a competitive exclusion mechanism. Mechanisms of adhesion to host tissue have been intensively studied in numerous pathogens, such as Escherichia coli and Pseudomonas aeruginosa, and many are mediated by attachment to oligo- and polysaccharide …
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Dynamics in Discrete Time: Successional Communities, Spatial Models, and Allee Effects
… not previously seen in pioneer–climax models. Competitive exclusion of the pioneer species and of the climax species are both possible depending on the relative strength of competition. Stable coexistence of both species may also occur at both fixed population-densities and fluctuating …
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Plant ecology of the Namaqualand Strandveld : community structure and dynamics in a winter-rainfall desert
… was certainly no evidence for any deterministic competitive exclusion. The species make-up of the vegetation clumps suggests that a large element of chance is involved in the assembly of clumps, and the lack of any strong relationships in populations between the size of individuals and their …
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Microbial diversity and groundwater chemistry in a pristine aquifer
… as commonly believed to occur as a result of competitive exclusion. Instead, we found the two groups co-existing in the subsurface in a relationship that we argue is not only competitive, but mutualistic. Through further use of sediment traps to evaluate the attached microbial community, we …
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Characterisation of the HIV inhibitory activity of vaginal lactobacilli isolates from young South African women at high risk of HIV acquisition
… other hand are thought to protect against HIV by competitive exclusion, producing virucidal hydrogen peroxide (H2O2), maintaining an acidic pH by producing lactic acid and regulating immune responses in the FGT. This dissertation aimed to characterise the relative HIV inhibitory properties of …
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