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 23 for “"community similarity"”.
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Amphibian Community Similarity Between Natural Ponds And Constructed Ponds Of Multiple Types In Daniel Boone National Forest, Kentucky
… between amphibian species and habitat variables. Community comparisons were made using canonical correspondence analysis (CCA) and one-way analysis of similarity (ANOSIM). Stepwise regression models were developed to predict individual species abundance based on the habitat variables. Amphibian …
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Landscape history and contemporary environmental drivers of microbial community structure and function
… biogeographic patterns and connecting microbial community composition to ecosystem function. My objective was to investigate the relative influences of landscape legacies and contemporary environmental factors on the distribution of soil microbial communities and their contribution to ecosystem …
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Macroinvertebrate Community Response to Spatial Patterns of Water Quality and Habitat within Mining-influenced Headwater Streams of Appalachia
… This study aimed to determine macroinvertebrate community responses to physical and chemical gradients within six Appalachian headwater streams (four mining-impacted, two reference). Streams were sampled for benthic macroinvertebrates, habitat characteristics, and water chemistry in fall 2021 and …
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Changes in colonization dynamics and community structure of protozoans and macroinvertebrates in response to stress
… is considered, along with Pinkham and Pearson's community similarity index and traditional community structural parameters. The response of both communities is similar with respect to equilibrium number of taxa at both sites; however, the fitted rate constant, G, was accelerated in the organic …
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Assessing The Impacts Of Grazing By Piney Woods Cattle And Controlled Burning On The Herbaceous Layer In An East Gulf Coastal Plain Longleaf Pine Woodland
… burning have on plant diversity, biomass, and community similarity in a longleaf pine savanna in the East Gulf Coastal Plain.</p> <p>For this study, controlled burning combined with grazing yielded the highest diversity, with no burning with grazing yielding the lowest diversity. Controlled …
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Factors influencing the abundance, community composition and activity states of bacterioplankton from the tidal freshwater James River
… including changes in abundance, shifts in community composition and variable activity states. In the tidal-freshwater James River, variation in bacterial abundance was linked to nutrient availability and autochthonous production with highest bacterial densities associated with low-nutrient, …
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Assessing Wetland Restoration on the Delmarva Peninsula using Vegetation Characteristics
… for above-ground vegetation and seed bank community composition, annual biomass production, and vegetation carbon content (10 restorations from prior-converted cropland (aged 5-31 years), and 5 natural forested depressions). Within each wetland, hydrologic zones (emergent, transition, …
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Survey and Comparison of Amphibian Assemblages in Two Physiographic Regions of Northeast Tennessee.
… Assemblages were compared using an index of community similarity.</p> <p>Sites differed regarding amphibians detected. Temporal activity was not compared because of different species compositions. Instead, temporal data were compared to literature. Data will be used in future amphibian …
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Community Structure and Production of the Macrobenthos on Four Artificial Reefs in the Mississippi Sound in Relation to Substrate and Profile Type
… PERMANOVA found significant differences in community similarity between high and low profile structures. SIMPER further disclosed how the abundances of multiple taxa drove dissimilarity values between reef profile types and substrates.</p>
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Characterizing the ecology of coral reef microorganisms across different scales within the Caribbean
… in terms of influencing shifts in the microbial community. At a larger scale, seawater microbial communities collected from the protected reefsystem of Jardines de la Reina, Cuba had higher alpha diversity and community similarity, lower nutrient concentrations, and higher abundances of …
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The Influence of the Clean Water Act and Tributaries on the Fish Community of the Big Sioux River, South Dakota
… higher in 1994 than in 1967. The greatest fish community changes between years, as indicated by low community similarity indices, were below Brookings and Sioux Falls, and in the lower river. Distributions of reproductive and feeding guilds were not different between years, however, some …
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Fish and Habitat Relations at Multiple Spatial Scales in Cheyenne River Basin, South Dakota
… clusters had lower fish species richness and community similarity than river clusters. Using relative species composition, nine fish species were classified as stream specialists, whereas eight species were river specialists. To further analyze factors driving assemblages in small streams, the …
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Soil Microbial Community Distributions And Disease Suppressiveness In The Coastal Plain Of Georgia
… and metazoan communities by analysis of similarity (ANOSIM) revealed high within-group similarity by vegetation type, indicating land management intensity and vegetation cover is a strong determining factor in community similarity. Further analysis of fragments obtained by LH-PCR revealed …
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The impacts of seven silvicultural alternatives on vascular plant community composition, structure, and diversity in the southern Appalachians
… effects of each treatment on the vascular plant community were characterized by changes in species diversity, species composition, exotic species richness, Raunkiaer's life-forms, and growth-forms. Pre-treatment, baseline data, and a randomized block design ensured the precision of post-treatment …
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Efficacy of agroecological approaches to ameliorate trade-offs between food production and biodiversity conservation
… farming. Nonetheless, whilst the bird community similarity to natural forests was improved, ZBNF still has very limited value in conserving forest-specialised species. Chapter 4 is based on the same field data, but I use it to examine the relationships between the proportional cover of …
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Effects of a Textile Mill Effluent and a Low Water Dam on Benthic Macroinvertebrate Community Structure of the Guadalupe River in Comal County, Texas
… used to assess the impact of the effluent on the community structure of the Guadalupe River. Although the results of the RBA showed that the sites within the effluent were moderately to severely impaired, the effluent had little if any impact on sites downstream from the point of discharge. …
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A Survey of the Fishes and Habitat of the White River, South Dakota
… at 10 study reaches and composed 4% of the fish community. Excluding incidental species, 94% of the fish species were native to the White River. The Morisita-Horn index of community similarity indicated that the fish community was similar between years (CmH=0.9519) and among segments (CmH=0.8773 …
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'Islands' in an island: multiscale effects of forest fragmentation on lowland forest birds in Taiwan
… of forest fragmentation on species richness and community composition of lowland-forest birds in Taiwan. At a regional scale, Island Biogeography Theory was applied to examine area and isolation effects on species richness of lowland-forest birds using bird data derived from Breeding Bird Survey …
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Environmental Controls Over the Distribution and Function of Antarctic Soil Microbial Communities
Microbial community composition plays a vital role in soil biogeochemical cycling. Information that explains the biogeography of microorganisms is consequently necessary for predicting the timing and magnitude of important ecosystem services mediated by soil biota, such as decomposition and …
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Bacteriophages in the honey bee gut and amphibian skin microbiomes: investigating the interactions between phages and their bacterial hosts
… the role of geographic distance in bacteriophage community similarity. A total of 12 apiaries across a transect of the United States, from Virginia to Washington, were sampled and honey bee viromes were sequenced, focusing on the lytic and actively lysing temperate community of phages. Although …
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