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 35 for “"SPECIES COEXISTENCE"”.
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PATTERNS OF SEEDFALL AND SEEDLING ESTABLISHMENT IN AN EAST TEXAS RIVER FLOODPLAIN FOREST: THE CONTRIBUTION OF SEEDLING DYNAMICS TO SPECIES COEXISTENCE (PLANT DEMOGRAPHY, DISPERSAL, TREE REGENERATION, SURVIVORSHIP, MORTALITY)
… attack in causing seedling mortality. Tree species fell into two groups on the basis of their demographic characteristics and responses to unfavorable conditions. For heavy-seeded species, of which water oak was the primary example, few seeds were produced, but seedling survival was high. …
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The role of life history traits for coexistence and forest recovery after disturbance – a modelling perspective. Towards a better understanding of species-rich forests
… forests are well known for their exceptional species richness – high diversity of plant species constitutes the basis for an equivalently rich fauna. An astonishing variety of plant life strategies has evolved, manifesting itself also in different compositions of life history traits in trees. …
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Occurrence, Composition, and Habitat Associations of Terrestrial Herbaceous Plants in a Tropical Forest Community
… a central hypothesis for the maintenance of species diversity. However, all plants require seemingly identical resources, which would appear to limit the number of niche dimensions available for species to inhabit. Woody species continue to be used to characterize the dynamics of tropical …
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Host Specificity, Negative Feedbacks, and Pathogen Defense in the Plant Phyllosphere Microbiome
… (Panicum virgatum) and across 19 plant species within the Asteraceae family. In these works, I found contrasting results for the importance of host specificity, where fungal endophytes did not preferentially colonize specific host ecotypes within a single species, but did preferentially …
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Influence of soil water regime on nitrogen availability and plant competition in wet meadows
… drivers controlling the equilibrium of species coexistence in wet meadows include site hydrology, soil nutrient availability and grazing. Of these, depth and annual variation of the water table has been considered as a primary factor and been frequently used in management decisions. A …
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Effect of Population Sources and Species Pools on Community Phylogenetic and Functional Diversity During Restoration
… new insights into how variation within dominant species interact with the local species pool to influence the structure of restored plant communities. Many studies have examined the effect of dominant species and species pools in structuring plant communities, but few have investigated their …
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A quantitative model of density-dependent habitat selection: integrating isodar and isoleg theories
… 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 existing models being mostly conceptual and limited in application. …
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Spatial point process modelling of a biodiverse plant community
… mechanisms that sustain biodiversity and allow species coexistence through an analysis of a biodiverse plant community in Western Australia.<br/><br/>Terrestrial plants are non-motile organisms and hence interact mainly with their nearest neighbours. Therefore, plant community dynamics need to …
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An experimental test of intra- and inter-specific competition between invasive western mosquitofish (Gambusia affinis) and native plains topminnow (Fundulus Sciadicus)
1. Invasive species are a major threat to freshwater conservation. Species coexistence in invaded habitats depends on the relative strength of intra- versus inter-specific competition, where inter-specific competition from invasive species to native species is often stronger than intra-specific …
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Biotic and abiotic mechanisms shaping multi-species interactions
… structure, which makes the study of multi-species interactions critical for understanding the ecology and evolution of organisms. This dissertation includes four data chapters that examine the biotic and abiotic mechanisms that shape multi-species interactions in both tropical and temperate …
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Ecology and evolution of invasive maple tree species
… has thus been devoted to the study of invasive species, which in tum has shown to provide valuable insights on ecological and evolutionary processes regulating species coexistence. A proper test of mechanisms promoting invasions requires nonetheless the use of a biogeographical approach between …
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Spatio-Temporal Patterns, Correlations, and Disorder in Evolutionary Game Theory
… to understand the emergence of biodiversity and species coexistence. Meanwhile, it has been realized that techniques from statistical physics can aid us to gain novel insights into this interdisciplinary field. In our research, we mainly employ individual-based Monte Carlo simulations to study …
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Reproductive ecology and population dynamics of two sympatric species of Macoma (Bivalvia)
… of seasonal gonadal changes indicate that both species undergo dormancy in the winter months and rapid gamete proliferation in the spring. However, the timing of spawning differs. The M. secta population synchronously spawned in August while the M. nasuta population spawned lightly in late …
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Growth release of trees following fine-scale canopy disturbances in old-growth forests of coastal British Columbia, Canada
… on release of the three shade-tolerant tree species that constitute these stands: western red cedar (Thuja plicata), western hemlock (Tsuga heterophylla), and Pacific silver fir (Abies amabilis). As a first step, I calibrated the radial-growth averaging method to account for regional-scale …
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Conditions Responsible For The Success Of Carnivorous Plants In Nutrient-Poor Wetlands
… between carnivorous and non-carnivorous plant species. I addressed the following three questions: (1) does niche complementarity promote coexistence between fire-adapted carnivorous and non-carnivorous species? (2) do carnivorous plants rely on both leaf traps and arbuscular mycorrhizal fungi …
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Examining neotropical primate community structure at regional and local scales : insights from taxonomic and phylogenetic approaches
… structure. I investigate the variation within species ranges in relation to species richness and patterns of species relatedness. Results suggest positive associations among species throughout their distributions, whereby species tend to present higher richness within their ranges than average …
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Ecological assembly of high-diversity plant communities: dispersal, competition, and environmental filtering in longleaf pine savannas
… through their effects on established plant species and recruitment from the species pool. Consistent with dispersal-assembly theory, I found that dispersal from the species pool strongly limited local species diversity regardless of the presence of these three niche-based ecological filters. …
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Evolutionary palaeoecology of the megaherbivorous dinosaurs from the Dinosaur Park Formation (upper Campanian) of Alberta, Canada
… partitioning played an important role in the coexistence of these animals, with each species consuming a different plant resource than the next, thereby minimizing interspecific competition. This dissertation uses the megaherbivorous dinosaur assemblage from the upper Campanian Dinosaur Park …
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Ecological significance of seed traits in the genus Macaranga
… and pathogens. In this study ten Macaranga species (Euphorbiaceae) varying in seed mass and adult crown illumination were used as a study system to test hypotheses linking seed mass to light and soil moisture requirements for germination, investment in seed chemical and physical defense, and …
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