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 22 for “"species pool"”.
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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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On the assembly of a grassland plant community
The species pool for a site is defined as that set of species which have a non-zero probability of maintaining viable populations under the prevailing environmental conditions. it may contain many more species than are actually present in the community of the site. The science of community assembly …
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Seasonal patterns of colonization by protozoa in an oligotrophic lake
… a season, changes in the lake's planktonic species pool were more prominent during the decay of the thermocline than during Fall or Spring overturn and Summer stratification. For different seasons, the relationship between changes in the lake's planktonic species pool and species accrual on …
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Seed mix design and application to overcome seed limitation in floodplain forest restorations
… focused primarily on the establishment of canopy species, operating under the assumption that understory species will naturally recolonize. However, the compositional differences between restored and reference forest understories are apparent. To enhance the compositional similarity of restored …
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EFFECTS OF TIME, SEED SOURCE, AND PLANT COMPOSITION ON MACROINVERTEBRATES IN RESTORED PRAIRIE
… and examine whether the source of dominant plant species and the composition of non-dominant plant species influence aboveground macroinvertebrates community structure in restored prairie. A chronosequence design (space for time substitution) was used to determine the role of restoration age, …
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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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Habitat models for plant functional groups with respect to soil parameters and management
… to preserve the local and regional floristic species pool. For this purpose presence/absence data of the occurring plant species were recorded along with abiotic parameters such as soil and climatic factors and management strategy on variously utilised investigation plots. For selected species …
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Insects in urban brownfields: analyses of species occurrences, community composition, and trait frequencies along a successional gradient
… (derelict sites) are home to a variety of species. Brownfield habitats show high spatio-temporal dynamics, forcing species constantly track suitable habitat. The thesis provides insight into the mechanisms of leafhopper and grasshopper species survival in brownfield habitats. Within a …
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FORAMINIFERAL COMMUNITY DYNAMICS OF THE CHESAPEAKE GROUP, CALVERT CLIFFS, MARYLAND, USA
… Cliffs dataset and relative abundance of all species were documented over the ~4-million-year period represented by the sampling scheme. The majority of abundant species occurred, with little change in relative abundance, over several sea-level cycles. Many rare species, however, occurred …
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When do propagules matter? The role of ecological filters and regeneration dynamics during community assembly in tallgrass prairie restorations
… the role of regeneration dynamics and dominant species on community assembly during tallgrass prairie restoration. In the first study, patterns in the abundance, richness, and diversity of seed and bud banks were quantified across an 11-year chronosequence of restored prairies and in prairie …
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Zooplankton Species Composition and Diversity in Floodplain Ponds: Effects of Flooding and Local Site Characteristics
… and dispersal of colonists from the regional species pool together shape local communities. Physicochemical characteristics and biotic interactions influence local conditions and physical connection through flooding provides dispersal corridors for inundated pond communities. I explored …
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The impacts of voluntary private lands programs on stream fish diversity in the Kaskaskia River Basin, Illinois
Freshwaters support over 40% of fish species diversity, as well as one-third of all vertebrate species, yet remain one of the most threatened habitats globally. Anthropogenic disturbances have caused many negative impacts throughout history, and continue to do so today. After the dust bowl we began …
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The Role of Native Diversity and Successional Processes on Communityinvasibility in Riparian Primary Forest
… and address the following: 1) Does exotic species richness and percent cover change across successional time? 2) What is the relationship between native and non-native diversity and does that relationship change through succession? Vegetation surveys were conducted to quantify plant species …
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Emergent behaviors in complex microbial ecosystems
… communities harbor diverse and abundant species. Understanding the complex emergent phenomena of diversity, stability, and invasibility in these communities within a unified framework has been a significant challenge. My PhD thesis addresses this knowledge gap by conducting the first …
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Community persistence and the pattern of community variability over time: a test using fossil assemblages from four marine transgressions in the Breathitt Formation (Middle Pennsylvanian) of Eastern Kentucky
… environments. Fossil collections were made and species abundance distributions were obtained for each paleontological sample. Multivariate statistical analyses such as cluster analysis and principle components analysis were used to classify fossil assemblages sampled into a variety of …
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Assessing the Role of Declining Calcium in Biological Recovery on Zooplankton in Historically Acidified Lakes
… on zooplankton communities, with reductions in species richness, and in extreme cases, local extirpations. Although lake pH is recovering due to emission control policies, many acid-sensitive species (e.g. large Daphnia) have failed to re-establish in lakes, despite their occasional detection in …
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The Effects of Vegetation on Ecosystem Services Provisioning by Stormwater Bioretention
… guidance in arid regions favors stress tolerant species whereas planting guidance in humid regions favors competitive species rela- tive to the native species pool. Across all climate zones, there is a notable anti-ruderal bias, which could limit bioretention resilience by reducing its capacity …
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Drivers of plant and arthropod diversity and community structure in a grassland ecosystem
… different spatial scales are known to influence species coexistence and community organization, although the relative importance of these forces is debated. While niche-based models emphasize the effect of local processes on community structure, regional species pools and dispersal abilities of …
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Chemosynthetic communities in the deep sea : ecological studies
… seawater. Patterns in the distribution of species that occur at hydrothermal vents can be used to predict locations of the vent sites. Patterns in the distributions of species among vents along ridge segments are used to identify the spatial scales over which biological and physical …
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The value of animal behaviour as a bio-indicator of restoration quality
… through the planting of fast growing non-native species is no longer thought of as responsible restoration practice. We have a better understanding of ecological thresholds, the creation of novel ecosystems and the ways ecosystems move between stable states through transitional processes. Yet …
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