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 590 for “"Community composition"”.
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Spectral Irradiance and Phytoplankton Community Composition In Blackwater Estuaries
… irradiance (water color) and phytoplankton community composition in blackwater habitats. Spatial and temporal variability in water color and phytoplankton community composition were examined in two South Carolina estuaries: Winyah Bay and North Inlet. In Winyah Bay, the composition of the …
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Bacterioplankton community composition and activity in the Atlantic Ocean
… detect standing stock changes and characterise community<br/>structure in the Northern and Southern oligotrophic gyres and in the equatorial region.<br/>There was no statistically significant inter-annual variability in Prochlorococcus or<br/>Synechococcus abundance or integrated biomass in any …
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Grazing Management and Plant Community Composition on Bodmin Moor
The research presented in this thesis was focused on aspects of the dynamic response of upland vegetation to grazing, to allow evaluation of the suitability of Countryside Stewardship (CS) management for the rehabilitation of dwarf-shrub cover in the upland landscape of Bodmin Moor. Initial …
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Productivity and community composition change in prairie biomass feedstocks
1 PDF file (vii, 57 pages)
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Picophytoplankton of the Northeast U.S. Shelf: community composition and dynamics
… daily division and loss rates for a nearshore community of picoeukaryotes over a 16-year period. I compare their cell concentrations, vital rates, and responses to environmental variables to those of the cyanobacteria, Synechococcus. Next, to reveal how these dynamics relate to changes in …
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Picophytoplankton of the Northeast U.S. Shelf: Community Composition and Dynamics
… daily division and loss rates for a nearshore community of picoeukaryotes over a 16-year period. I compare their cell concentrations, vital rates, and responses to environmental variables to those of the cyanobacteria, Synechococcus. Next, to reveal how these dynamics relate to changes in …
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Dynamics of phytoplankton community composition in the western Gulf of Maine
… is founded on the importance of phytoplankton community composition to marine biogeochemistry and ecosystem processes and motivated by the need to understand their distributions on regional to global scales. The ultimate goal was to predict surface phytoplankton communities using satellite …
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Gastrointestinal microbiota community composition has significant effects on systemic immune responses
… effects of early life colonization on microbiome composition and systemic immune responses. One group of newly weaned pigs was inoculated with an oral microbial inoculum (modulated), while another group (control) was not. Sequencing results show a successful modulation of the GI microbiome through …
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Changes in archaeal and bacterial community composition following entombment in halite crystals
… and that Bacteria are about 0.25% of the overall community in both conditions. Remarkably, few differences were observed in terms of abundance and community structure between communities in 21-week-old halite and those found in the parent brines. Evidently, all organisms of a mixed microbial …
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Investigation of bacterial community composition and abundance in a lowland arable catchment
This study aimed to characterise the bacterial community composition and abundance in the River Wensum in Norfolk using epifluorescence microscopy (EFM), automated ribosomal intergenic analysis (ARISA) and 454 pyrosequencing. It also aimed to determine the effects of spatial and temporal variations …
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Zooplankton abundance, community composition and grazing in the James River Estuary (Virginia, USA)
… algal-food resources. Zooplankton abundance, community composition and grazing rates were assessed at three locations which included a site with high algal production (near the VCU Rice Center) and two sites where algal production was lower. Grazing rates were measured by determining the rate …
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Arthropod Predation in Brassica Agroecosystems: Effects of Latitude, Community Composition, and Diet Breadth
… populations and can impact predation in a community context by determining whether predatory taxa will compete over shared prey, attack each other as intraguild prey, or partition herbivore taxa into distinct prey niches. To assess the effect of latitude, I first compared predation rates on …
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Environmental, spatial and temporal drivers of plant community composition in British forest habitat
… have an important effect on the trait composition of communities. Preserving large, well connected areas of habitat is therefore likely to be key for the conservation of many species, particularly rarer forest specialists which often possess traits linked to low dispersal ability. …
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Herbicide management alters fungal biomass and community composition in Great Lakes coastal wetlands
… We assessed microbial and fungal biomass, fungal community composition, greenhouse gas emissions, soil physiological profiles, and decomposition rates. Fungicide treatments of the substrate induced respiration assays had significantly lower microbial biomass carbon (p = 0.027), indicating that …
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Community Composition and Function of the Hindgut Microbiome in Seaweed-Eating Marine Fish
… and Bacteroidia and Clostridia dominated the gut community. Genes encoding endo-acting carbohydrate-active enzymes (CAZymes) associated with both classes suggest their involvement in initiating glycan depolymerization. Bacteroidia contributed the most to CAZyme-related gene expression in the …
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Investigating the effect of phytoplankton on bacterial community composition across different environmental contexts
… seasonal succession effects changes in bacterial community composition and characterizing interactions between phytoplankton and bacteria across different environmental contexts. Observational and experimental approaches were combined to determine the effect of phytoplankton on the composition of …
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The effects of invasive European Buckthorn (Rhamnus cathartica) on soil microbial community composition
… soil nitrogen and carbon by stimulating rapid decomposition of litter. Because decomposition and nitrogen cycling are microbial processes, I hypothesize that buckthorn invasion changes the community composition of soil microbes, and these changes should increase with increasing severity of …
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Determining the impact of carrion decomposition on soil microbial activity levels and community composition.
… have made it possible to compare microbial community profiles obtained from evidence or crime scenes to individuals and vice versa. Profiling microbial communities associated with cadaver decomposition may provide useful information concerning post-mortem intervals and aid in the …
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Factors affecting plant community composition and dynamics in the Ossipee Pine Barrens, New Hampshire
… Pine Barrens to identify and describe tree community types and investigate factors controlling forest composition and dynamics. Every site had three site-time assemblages (STA's) representing past, present, and future trees. Past (1952) vegetation was calculated based on reverse growth …
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