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 38 for “"mesocosm experiment"”.
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Aquatic community response to Zequanox®: a mesocosm experiment
… Using a six-week-long replicated aquatic mesocosm experiment, I simulated open-water applications of Zequanox® (100 mg/L of the active ingredient) to determine the responses of primary producers, zooplankton, and macroinvertebrates to Zequanox® exposure in a complex aquatic environment. …
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Interactions Among Invasive Species in Lakes: a Mesocosm Experiment
… three common snails in a three-factor split-plot experiment conducted in 12 outdoor tanks (2.1 m3). Results indicate that RC had significant negative effects on final biomass of all but one plant species, with the greatest total effects on single-stemmed and branched species. Rusty crayfish …
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Effects of ash from native and alien plants on phytoplankton biomass and mosquito abundances: A mesocosm experiment
… guava Psidium guajava)] based on a six–week mesocosm experiment with different ash concentrations (1 and 2 g L–1). We assessed concentrations of chemical elements, i.e., N, P, K, Ca, Mg, Na, Mn, Fe, Cu, Zn and B from ash collected, and observed significant differences amongst the species. …
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Benthic and pelagic responses to endobenthic bioturbator (Kraussillichirus kraussi) density, temperature and eutrophication in a global change mesocosm experiment
… and benthic compartments, using an indoor mesocosm experiment. Results from Chapter 3 of the thesis revealed that sandprawn water filtration (reduction in phytoplankton biomass) remained robust under simulated warming to levels predicted by the year 2100, with elevated temperatures …
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Estimating Nitrogen Fixation Rates, Importance, and Short-Term Efficiency in Small, Temperate Reservoirs Using Delta15N Techniques
… and water quality are not well-understood. A mesocosm experiment and ecosystem-scale observational study were conducted to 1) determine the efficiency of N2 fixation under varying N relative to phosphorus (P) supply, 2) examine the effects of N2 fixation on autotrophic biomass accumulation and …
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Effects of burrowing sandprawns (Callichirus kraussi) on urban estuarine water quality
… of C. kraussi on water quality, a laboratory mesocosm experiment and comparative in situ analysis were used in this study. In the mesocosm experiment, water quality at 3 increasing C. kraussi densities (0 [control], 100 and 200 individuals·m-2 ) were compared. At the end of the experiment, the …
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Water Flow and Sediment Texture as Co-Varying Submersed Aquatic Vegetation (SAV) Habitat Requirements
… (SAV) in the Chesapeake Bay. An outdoor mesocosm experiment was conducted to test the response of SAV (Zostera marina and Ruppia maritima) to combinations of water flows and sediment grain sizes characterized by sediment deposition, bedload transport and erosion. Water flow, sediment and …
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Spatial and Seasonal Patterns of Above- and Belowground Vegetation Biomass and Potential Drivers in the Pascagoula River Delta, MS
… approach and an <em>in situ</em> controlled mesocosm experiment, called a marsh organ. The West Channel of the Pascagoula River contained significantly higher belowground biomass than the East Channel, which is more anthropogenically modified. Vertical distribution of belowground biomass did …
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The Impact of Nutrient Loading from Canada Geese (Branta canadensis) on Water Quality, a Mesocosm Approach
We conducted a mesocosm experiment to determine the impact of Canada Goose (Branta cana.densis) feces on water quality parameters. After 30 days of fecal additions (treatments of 2.419 g, 1.209 g and 12.090 g every 3 d) we found no significant impact on soluble reactive phosphorus, total …
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Size Structure and Intraguild Interactions between Two Ambystoma Species
… (<em>Ambystoma tigrinum</em>) using an outdoor mesocosm experiment. I hypothesized that 1) <em>A. opacum</em> survivorship and growth would be negatively impacted when both species start at a similar size because tiger salamanders grow faster and are more aggressive 2) <em>A. tigrinum</em> will …
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THE IMPACT OF SEA-LEVEL RISE ON COASTAL WETLANDS USING IN-SITU MESOCOSM EXPERIMENTS, LANDSCAPE MODELING, AND TRADITIONAL ECOLOGICAL KNOWLEDGE MAPPING
… metrics to these stressors using a controlled mesocosm experiment in the western channel of the Pascagoula River, Mississippi. I found varying strategies of growth between species and differing responses between the short- and long-term. Overall <em>Spartina alterniflora</em> performed better …
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Lipoxygenase Activity in Diatoms : A New Tool to Study the Antiproliferative Effects of Diatoms on Copepod Reproduction
… at sea, under semi-natural conditions during a mesocosm experiment, and in the laboratory, with special emphasis on <i>Skeletanema marinai</i>. The effect of diatom oxylipin production on copepod reproductive success was also examined.<br></br><br></br>Increased oxylipin production was found …
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Interactive effects of climate change and management on grassland greenhouse gas emissions
… grassland management is investigated in a field experiment over two growing seasons with varied microclimate effects, and the effect of plant composition manipulation in a controlled temperature mesocosm experiment. Overall, interactions between warming and management significantly affected GHG …
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Disentangling the influence of dispersal on community assembly and stability
… although the body of work in modeling and experimental research is growing. Future research should incorporate innovative methods to directly monitor dispersal at finer spatial and temporal scales. To address this knowledge gap, we experimentally manipulated dispersal mode (aerial and …
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The Influence of Trees on Soil Hydraulic Properties : Species Effects and the Provision of Ecosystem Services.
… higher soil macroporosity and macropore flow. A mesocosm experiment, undertaken to investigate the influence of tree roots and associated soil macrofauna on Ks, was found to be of insufficient duration for significant changes to occur; however non-significant higher Ks observed under Scots pine …
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Marine phytoplankton in a high CO2 world
… biogeochemical cycles. I participated in a large mesocosm experiment that observed altered community structure and carbon drawdown in response to increased CO2. There was a 27% reduction in community primary production at the peak of an Emiliania huxleyi-dominated bloom in mesocosms initially at …
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Survival strategies of eelgrass in reduced light
… by light reduction (Chapter II). An outdoor mesocosm experiment explained eelgrass response to a gradient of light conditions, improving the understanding of the relationship between light availability, growth and survival (Chapter III). The study concluded that at temperatures between …
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Woodland Restoration on Landfill Sites: Earthworm Activity and Ecosystem Service Provision
… such interactions. A large-scale field experiment and a nursery-based mesocosm experiment revealed the responses of the tree species Italian alder (Alnus cordata) and Norway maple (Acer platanoides) to CGW and earthworm addition in reclaimed soil. Findings revealed a synergistic effect …
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From single species to mesocosms: responses of freshwater copepods and their community to PCP
… derived laboratory microcosms and in situ mesocosms dosed with pentachlorophenol (PCP). Acute 48 h lethality tests used two copepod life stages (nauplii and adults). Tests were conducted at 22°C with laboratory cultured animals of all species and at varying temperatures with seasonally …
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Are aquatic food webs vulnerable to copper and gold engineered nanoparticles?
… nutrient conditions. In the 2016 CEINT Wetland Mesocosm study, mesocosms were exposed repeatedly with low, environmentally realistic concentrations of nanoparticles and nutrients over the course of a 9-month experiment. My work during this study determined decreased insect emergence in …
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