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 27 for “"Large rivers"”.
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Modelling of toxic contaminants in large rivers.
Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1988 .Y845. Source: Dissertation Abstracts International, Volume: 62-13, Section: A. Thesis (Ph.D.)--University of Windsor (Canada), 1988.
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Influence of stream connectance and network spatial position on fish assemblage structure in the Kansas River basin, USA
… size or abruptly at transition zones between large rivers and their tributaries. We evaluated the relative importance of these gradual and abrupt habitat transitions in regulating stream fish assemblages by quantifying roles of stream size and spatial position within a drainage network as a …
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Bacterial Assemblages And Microbial Enzyme Activity In The Major Tributaries Of The Lower Mississippi River
… analyses of bacterial assemblages in large rivers. Rivers form important connections between terrestrial land use and marine biogeochemistry and act as conduits for organisms and allochthonous nutrients. Bacteria dominate carbon cycling and nutrient processing in rivers, and therefore …
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The evolution of the Congo- Kalahari Watershed: African mega-geomorphology
… drainage divide separates two of the world's large rivers: the Congo and Zambezi Rivers. This study focuses on the large rivers which form the Congo–Kalahari Watershed. The analysis of their longitudinal profiles, through the use of a geographic information system and remotely sensed imagery …
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Food webs in the lower Waikato River and the role of hydrogeomorphic complexity
Large rivers are fundamental to human societies and consequently their ecosystems have come under increasing pressure from a range of developments and uses. Despite this, there is still a major knowledge gap understanding food webs supporting fisheries of large river ecosystems. Quantifying the …
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Satellite remote sensing of mixing dynamics at a large river confluence
… are detectable on remotely sensed images of rivers downstream from confluences, no systematic methodology has been developed for assessing mixing over distance of confluent flows with differing suspended sediment concentrations. In contrast to field measurements of mixing below confluences, …
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Relation of Missouri river flows to sandbar morphology with implications for selected biota
… and flow regulation in historically braided large rivers, have reduced sandbars and associated highly productive habitats for riverine biota. Sandbars are an important interface between aquatic and terrestrial environments, i.e. an aquatic-terrestrial zone (ATTZ), within the main channel of …
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Spatial distribution of anuran assemblages from Caxiuanã, Brazil : testing the riverine barrier hypothesis and the influence of life-history traits
… riverine barrier hypothesis, which assumes that large rivers act as main ecological drivers of diversification. However, life-histories, functional traits and environmental factors other than rivers have also been shown to affect the distribution of species in the Amazon. Typically, the riverine …
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Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape
… of the Tibetan plateau is characterized by large rivers dissecting regional topography that has been uplifted in association with the continued convergence of the Indian subcontinent and Eurasia. In this thesis, I utilize field observations, digital topographic data, cosmogenic isotope data, …
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Quantifying the Effects of Watershed Size and Land Development on Stream Nutrients
… water quality issues in very small streams to large rivers. Nutrient enrichment is exacerbated by urbanization and agricultural land use; however, the magnitude of the problem differs by regional landscape and environmental characteristics. Currently, we do not understand how regional variables …
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Morphodynamics of large anabranching rivers : the case of the Madeira River, Brazil
… channels are the dominant channel pattern of large rivers worldwide. The top nine largest rivers of the world by water discharge, in particular, all develop anabranching channels. Given the limited understanding on large river morphodynamics and the mechanisms of formation and process of …
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ECOLOGY AND COEXISTENCE OF SCAPHIRHYNCHUS STURGEON AT MULTIPLE SCALES
… are two species that depend solely on the large rivers of North America. Both species have experienced declines from habitat loss within the Mississippi River basin and overharvest due to the demand for black egg caviar, and are now protected from harvest where they overlap in range. …
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Reconstructing late Holocene Artctic climate change using high resolution sediment records from Simpson Lagoon, Alaska and the Colville River alluvial valley
Arctic nearshore environments proximal to large rivers, like Simpson Lagoon, Alaska, potentially contain high-resolution sediment archives that can be utilized to reconstruct paleoclimate variability over the late Holocene. The ongoing, rapid environmental changes recently observed in the Arctic …
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Spatial and temporal influences on the physiological condition of invasive silver carp
… which includes the Illinois, Ohio, and Wabash rivers, and their range is expanding. The establishment of Asian carp has the potential to negatively influence the community structure of native species. For example, Asian carp are efficient, filter-feeding planktivores that may negatively affect …
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Life history and secondary production of Cheumatopsyche spp. in a small Appalachian stream with two different land uses on its watershed
… obtained at streams in agricultural areas and large rivers. Production was less than from sites below food-enriched reservoir releases or from snag habitat in southeastern, coastal-plain rivers. Detritus was the greatest component of the diet of Cheumatopsyche at the two sites, but detritus and …
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Distributional analysis of the freshwater mussel fauna of the Tennessee River system, with special reference to possible limiting effects of siltation
… habitats spanning the transition from medium to large rivers; reaches now altered by impoundment. The maximum number of species reported in recent collections from any one site in the Tennessee drainage is less than 40, which seems to be the maximum number of species niches available. …
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Relationships Among Swimming Ability, Habitat use, and Morphology of Freshwater Fishes from Texas and Louisiana
… inhabiting areas of swifter currents (medium to large rivers) and those with lesser absolute speeds inhabiting areas of slower currents (springs, creeks, and small rivers) (r2 = 0.40; N = 37; P < 0.01 ). Similarly, swimming ability primarily explained spatial (i.e., runs, pools, and riffles) …
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Modelling of environmental change impacts on water resources and hydrological extremes in Germany
… 2051-2060. Water discharge in all six studied large rivers (Ems, Weser, Saale, Danube, Main and Neckar) would be 8 – 30% lower in summer and autumn compared to the reference period (1961 – 1990), and the strongest decline is expected for the Saale, Danube and Neckar. The 50-year low flow is …
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Geographic expansion and small stream use by three species of invasive Asian carp in Illinois
… on Asian carp has focused nearly exclusively on large rivers (e.g., the Mississippi, Missouri, and Illinois rivers) and little is known about the use of smaller rivers and streams by Asian carp. Because small streams are usually less productive than larger rivers, they may be more vulnerable to …
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