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 118 for “"mesocosm"”.
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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
Nonindigenous invasive species (NIS) have become increasingly common worldwide and are one of the leading causes of biodiversity loss in freshwater. Three widespread NIS in Wisconsin lakes are rusty crayfish (Orconectes rusticus, RC), banded mystery snails (Viviparus georgianus, BMS), and Eurasian …
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A Mesocosm Study of Bioretention Functionality Under Frozen Conditions
… function under frozen conditions using 24 mesocosm cells in Okotoks, Alberta. The mesocosm cells were lined and had three types of media, three types of vegetation, and two different impervious to pervious ratios. Media types included two typical bioretention media as well as an …
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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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Design and evaluation of a modified in situ mesocosm to study denitrification in the Karlsruhe aquifer
To simplify the in situ mesocosm (ISM) design given in Schlag (1999), a modified ISM was designed and built in which a 6-inch long sand point replaces three 16-inch diameter screens. The modified design also includes an optional submersible pump mounted on top of the ISM chamber, making it capable …
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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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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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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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THE IMPORTANCE OF PHYSICAL MIXING AND SEDIMENT CHEMISTRY IN MERCURY AND METHYLMERCURY BIOGEOCHEMICAL CYCLING AND BIOACCUMULATION WITHIN SHALLOW ESTUARIES
The objective of this study was to examine, using mesocosm experiments, the long-term effects of sediment resuspension on the fate, transport, and bioaccumulation of Hg and MeHg in shallow ecosystems. A bioenergetic-based model including sediment resuspension was developed to assess MeHg …
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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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Effects of turbidity on the kelp Ecklonia radiata
… the Hauraki Gulf, north-eastern New Zealand, and mesocosm experiments, to determine the effects of turbidity, and light, on the physiological performance, productivity and persistence of a subtidal kelp, Ecklonia radiata. Results from field studies showed that light was a primary driver of the …
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Variations in coral reef net community calcification and aragonite saturation state on local and global scales
… correlation based on data from 15 field and mesocosm studies around the globe. The general relationship agrees well with results from mesocosm experiments. This general relationship implies that NCC will transition from net calcification to net dissolution at a Ωa of 1.0 ± 0.6 and predicts …
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Variations in coral reef net community calcification and aragonite saturation state on local and global scales
… correlation based on data from 15 field and mesocosm studies around the globe. The general relationship agrees well with results from mesocosm experiments. This general relationship implies that NCC will transition from net calcification to net dissolution at a [Omega]a of 1.0 ± 0.6 and …
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Ecosystem Functional Consequences of Top Predator Mortality Due to the Invasive Shrub, Lonicera maackii
… phenolic compounds that inhibit respiration. A mesocosm experiment was developed to characterize the cascading effects of increased top predator (Ambystoma maculatum) mortality on larval salamander growth, macroinvertebrate densities, zooplankton densities, leaf litter mass loss, chlorophyll a …
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Carbon dosing of denitrifying bioreactors to remove nitrate from agricultural drainage
… Through observations ranging from field to mesocosm experiments, this thesis sought to (1) determine whether and to what extent external carbon dosing could improve nitrate removal in bioreactors and (2) assess the potential adverse effects of carbon dosing, such as reduced hydraulic …
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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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Large and small-scale movement patterns of the West Coast rock lobster, Jasus lalandii
… program, (2) observations on rock lobsters in a mesocosm aquarium, (3) surveys that monitored the seasonal fluxes in activities and abundance of rock lobsters in the field, (4) video recordings of movement behaviour in small aquaria and (5) acoustically tracking the movements of four individual …
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Influence of soil water regime on nitrogen availability and plant competition in wet meadows
… dependent on soil water regime. Laboratory and mesocosm experiments alongside field observations were undertaken to explore the interrelationships between water regime, nitrogen availability and plant competition.Three coexisting meadow species: meadow fescue, <i>Festuca pratensis</i>, common …
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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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