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 32 for “"salinity gradient"”.
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Evaluating the role of flow and specific conductivity on stream metabolism across a mining-induced salinity gradient in the Appalachian Coalfield
… but there are few measurements assessing how salinity effects on organisms influence whole-ecosystem processes, specifically stream metabolism. Understanding how gross primary production (GPP) and ecosystem respiration (ER) respond to salinity, stream flow, and their association is needed to …
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Salt in the Wound: Trophic Mismatches Emerge Between Macroinvertebrate Secondary Production and Basal Food Resources Along a Salinity Gradient in Central Appalachian Headwaters
… ions (e.g. Cl-, Ca2+, SO42-) that increase salinity, as measured by specific conductance (SC). It has been long understood that benthic macroinvertebrate communities, particularly Ephemeroptera and scraper feeding groups, decline in abundance and biomass at elevated SC in streams, though …
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Sedimentology and Shallow Groundwater Responses of a Coastal Marsh Along a Salinity Gradient: A Case Study In Grand Bay National Estuarine Research Reserve, Mississippi
… 2015 and Fall 2016 are established along a salinity gradient at four sites using water levels, temperature, and conductivity monitored at the surface and in piezometers at depths of 0.75m, 1.5m, and 2.25m.</p> <p>Sediment analysis indicates reducing conditions throughout with redoximorphic …
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The effects of salinity on the cutaneous microbiome and pathogen infection on the Pacific Tree frog (Pseudacris regilla) in Monterey Bay, California, USA
… declines worldwide. Changes in precipitation and salinity have altered watershed systems and microbial communities, reducing habitat availability and physiological performances for amphibian survival. The salt refuge hypothesis, however, is a proposed explanation that higher saline environments …
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Finestructure and turbulence in the deep ocean
… with finestructure profiles of temperature, salinity and density and compared to models of ocean turbulence. Images with vertically aligned periodic structure, called bands, are identified as salt fingers, while others with chaotic structure are turbulent. Images are found on interfaces that …
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The Application of Improved Numerical Techniques to 1-D Micellar/Polymer Flooding Simulation
… among the models was rather large with constant. salinity, a salinity gradient produced high oil recovery and low surfactant trapping with all three models. Since surfactant trapping is important and it is highly uncertain, this is another reason for designing a micellar flood with a salinity …
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Ion Transportation and Adsorption in Two-Dimensional Materials
… water desalination, ion capture and storage, and salinity gradient energy harvesting. Most of the ionic devices function based on the transportation or adsorption of ions. Hence, it is of critical importance to study the fundamentals and applications of ion transportation and adsorption. 2D …
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Effects of Freshwater Salinization and Associated Base Cations on Bacterial Ecology and Water Quality
… uptake rates responded across a freshwater salinity gradient of different salt profiles. Survival rates (t90) of Escherichia coli, the EPA recommended freshwater FIB, increased by over 200% as salinity increased from 30 to 1,500 µS cm-1. Survival rates were also significantly higher in water …
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Ectoparasites of the southern mullet Liza Richardsonii in the Berg Estuary, South Africa
… abundance and diversity on fish in relation to salinity gradients in the Berg Estuary. The host species studied was the commercially important, euryhaline southern mullet Liza richardsonii that is superabundant in estuaries of the Western Cape. A total of 210 fishes were sampled by using a …
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Phytoplankton Abundance and Species Composition in Relation to Environmental Paramenters in Coastal Mississippi Waters
… the Mississippi Bight (station 8), following a salinity gradient. A time series of the observations documented the variability of different taxonomic groups and phytoplankton abundance in Mississippi waters. Phytoplankton abundance and species group composition were related to environmental …
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Mechanisms and variability of salt transport in partially-stratified estuaries
… determines the variation of the length of the salinity intrusion and the large-scale density gradient in an estuary. This thesis contains three studies that address salt transport and the salt balance. The variation of salt transport with the depth, the along-channel salinity gradient, and the …
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Mechanisms and variability of salt transport in partially-stratified estuaries
… determines the variation of the length of the salinity intrusion and the large-scale density gradient in an estuary. This thesis contains three studies that address salt transport and the salt balance. The variation of salt transport with the depth, the along-channel salinity gradient, and the …
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A finite element model of submarine ground water discharge to tidal estuarine waters
… to be essential to replicating the complex salinity gradients observed in the ground water within the intertidal zone. Field data and model results confirmed the presence of a region of ground water where an inverted salinity gradient existed. In this region the concentration of salinity …
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Phase Speciation of Carbohydrates and Dioxins in Rivers and Coastal Waters in the Northern Gulf of Mexico
… to examine the behaviour of CHO species along a salinity gradient. The phase partitioning of dioxin among three different phases, i.e., colloidal organic matter, particulate organic matter and sediments, was also determined for Mississippi River and Pearl samples. MCHO was the dominant species in …
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Dominant substrates used by methanogens in hypersaline environments
… extent than the controls across the entire salinity gradient sampled and there was also demonstrated use of 13C-labeled methanol at all of the Guerrero Negro sites. Apparent fractionation factors were calculated to determine if they could be used to predict dominant substrates of hypersaline …
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Effects of Landscape Age and Salinity on Plant Community Composition and Productivity in Opportunistic and Constructed Wetlands in the Athabasca Oil Sands Region, Alberta
… in adjacent areas in the AOSR to determine how salinity and age influence the vegetation community composition, and the biomass of six dominant wetland plant species (Carex aquatilis, Calamagrostis canadensis, Carex atherodes, Carex utriculata, Schoenoplectus tabernaemontani, and Typha …
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Gulf Stream temperature, salinity and transport during the last millennium
… changes in Gulf Stream cross-current density gradient during the last millennium. These data imply that Gulf Stream transport during the Little Ice Age (LIA: 1200-1850 A.D.) was 2-3 Sv lower than today. The timing of reduced flow is consistent with cold conditions in Northern Hemisphere …
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Sodium-Calcium Ratios in the Planktic Foraminifera <i>Trilobatus Sacculifer</i> as a Proxy for Sea Surface Salinity
… positive correlation between seawater salinity and the incorporation of sodium into foraminiferal calcite, suggesting a potential new proxy for reconstructing past changes in sea surface salinity (SSS) (Mezger et al., 2016 and Bertlich et al., 2018). In order to test the applicability …
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Spatial and temporal variability of carbon stocks within the River Colne Estuary
… content. Therefore, three saltmarshes along the salinity gradient of the Colne Estuary were studied. The effect of the study sites’ locations along the estuary, higher plant species distribution, above-ground biomass and aerobic respiration on TOC content was investigated. The spatial and …
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Mechanisms of tidal dispersion in a salt marsh estuary
Dispersion in estuaries sets the length of salinity intrusion and the horizontal mixing rate of waterborne constituents, including larvae, nutrients, sediments, and contaminants. While bulk calculations of dispersion are readily estimated using traditional field measurements, the mechanisms …
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