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 22 for “"sediment depth"”.
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Tracing viable bacteria in Wadden Sea sediments using phospholipid analysis
… different types of lipids from bacteria and sediments. Special emphasis was placed on the analysis of intact phospholipids by HPLC-ESI-MS/MS, because phospholipids appear to be suitable biomarkers to trace viable bacteria. The specificity of phospholipids as biomarkers was tested by …
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Pore water biogeochemistry and trace metal dynamics in deep intertidal flat sediments
… which allows pore water sampling down to 5 m sediment depth. Sulphate, DOC, and nutrients were studied for the identification of organic matter remineralization pathways. Differences in sediment structure and hydrological conditions explain spatial variations in pore water depth profiles of …
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A study of nutrient distributions and productivity potential in lake sediments
… purpose of this investigation was to study the sediment in the upper reaches of Claytor Lake. The lake is a manmade impoundment on the New River near Radford, Virginia. Eleven core samples, varying in length from 66 cm. to 141 cm, were taken from the lake. The concentration of various water …
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Habitat suitability and population characteristics of smallmouth bass and rock bass in the Powell River, Virginia
… reach appeared to have been impacted by sedimentation less than either of the other reaches. Habitat Suitability Index (HSI) models were used to identify habitat variables that were below optimum for these species in the Powell River, Virginia. Habitat sampling yielded HSI scores for …
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The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico
… seeps, wood falls, octocoral, and deep-sea sediments. However, it was unknown if the presence of man-made structures on the seafloor, including historic shipwrecks, also resulted in a distinct core microbiome. To determine how historic shipwrecks impact sediment microbiomes under varying …
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Effect of riparian land use on the biotic integrity of fish assemblages in Black Creek, Chattanooga, Tennessee
… some level of habitat degradation (bank erosion, sedimentation, loss of riparian vegetation) was observed at all sites. Electrofishing samples yielded a total of29 species and 9,178 fish. Index ofbiotic integrity (IBI) scores ranged from 30 to 42, corresponding to IBI ratings of "poor" to "fair," …
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Influences of watershed urban development on habitat heterogeneity and native fish diversity in a ridge and valley stream in Southeastern Tennessee
… in the watershed was positively correlated with sediment depth and negatively correlated with species richness, substrate diversity, and variation in stream shape. Riparian natural cover was positively correlated with variation in current velocity. Results of this study emphasize the negative …
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Determination of sediment, water quantity and quality for swat modelling of sedimentation in the Makoye reservoir, southern province, Zambia.
Reservoir sedimentation is one of the temporally and spatially distributed challenges facing managers of small reservoirs today. Fluvial system formed the geomorphological plinth of the study. The study was motivated by the problem of sedimentation in the Makoye Reservoir (about 60500 m2), which …
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Identification of Ecosystem Stressors in Developing an Enhancement Plan for the Leading Creek Watershed, Meigs County, Ohio
… parameters studied included water and sediment quality, algal colonization upon artificial substrates, benthic macroinvertebrate sampling (qualitatively and quantitatively), acute water column toxicity, sediment chronic toxicity and </i>in situ</i> clam toxicity. Evaluation of habitat …
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Characterization of microbial primary and secondary metabolism in the marine realm
… particularly oxygen-depleted water columns and sediments, however, remain under-represented in these studies. Analysis of BGCs in free-living and particle-associated microbial communities along the oxycline water column of the Cariaco Basin, Venezuela, revealed that differences in water column …
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Characterization of Microbial Primary and Secondary Metabolism in the Marine Realm
… particularly oxygen-depleted water columns and sediments, however, remain under-represented in these studies. Analysis of BGCs in free-living and particle-associated microbial communities along the oxycline water column of the Cariaco Basin, Venezuela, revealed that differences in water column …
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The effects of coal mining on sedimentation and fish assemblages in the Powell River, Virginia
… of land uses on hydrology, water quality, sedimentation (particle size < 2 mm), and fish assemblages and to derive ecological indicators for monitoring. The hydrologic (disturbance) regime of the sixth order reach was Classified. Although surface coal mining appears to have reduced flow …
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Chlorophyll diagenesis in the water column and sediments of the Black Sea
… of chlorophyll in the Black Sea water column and sediments. Measurements are made of total chlorophyll in sediment traps from two locations and depths in the water column, and at two locations in surface sediments. Individual chlorophyll degradation products are also identified. This data is used …
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Carbon storage and preservation in seagrass meadows
… to retention and persistence of OC in seagrass sediments. The research summarised in this dissertation examined 37 sediment cores from twelve Australian seagrass meadows (Posidonia australis and Halophila ovalis) in order to improve our understanding of OC storage and preservation in seagrass …
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Development of an Algal Diet for Rearing Juvenile Freshwater Mussels (Unionidae)
… 145-L recirculating culture systems containing sediment (< 600 μm) of two depths, 5 mm and 15 mm. Mussels were fed a bi-algal diet of Nannochloropsis oculata and Neochloris oleoabundans. Survival differed significantly between treatments (p=0.04), and was higher for juveniles reared in 5 mm of …
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An Ecotoxicological Evaluation of Active Coal Mining, Sedimentation and Acid Mine Drainage in Three Tributaries of the Leading Creek Watershed, Meigs County, Ohio
… mining, agricultural and abandoned mined land sedimentation and acid mine drainage (AMD), respectively. An ecotoxicological evaluation was performed using physical (water chemistry and sediment depth analyses), toxicological (acute water column, chronic sediment and 35-day in situ toxicity …
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Assessment of sediment and water quality in Sembrong Reservoir, Johor
… Pahat. Depletion of storage capacity due to the sedimentation process and eutrophication has recently been the most concerning issues at the reservoir. The objectives of this research are to analyze the distribution of sediment and sedimentation rate in Sembrong reservoir by using GIS. Also, to …
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Effects of sedimentation on water-linked sectors in the Lusitu river catchment in southern Zambia.
The problem of sedimentation and drying-up of rivers is very pronounced globally, continentally, and nationally. In Southern Zambia and, Lusitu River Catchment in particular, sedimentation and eventual drying up of the river during most parts of the year punctuated diverse environmental and …
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Effects of sedimentation on water-linked sectors in the Lusitu river catchment in southern Zambia.
The problem of sedimentation and drying-up of rivers is very pronounced globally, continentally, and nationally. In Southern Zambia and, Lusitu River Catchment in particular, sedimentation and eventual drying up of the river during most parts of the year punctuated diverse environmental and …
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