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 33 for “"Vertical distributions"”.
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Vertical distributions of megafauna on inactive vent sulfide features correspond to their feeding modes
… of environmental conditions on megafaunal distributions using highresolution imagery of two inactive sulfide features, Lucky's Mound and Sentry Spire, to determine how taxonomic composition and feeding traits vary with vertical position on the features. A total of 51 morphotypes, each …
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Vertical distributions of megafauna on inactive vent sulfide features correspond to their feeding modes
… of environmental conditions on megafaunal distributions using highresolution imagery of two inactive sulfide features, Lucky's Mound and Sentry Spire, to determine how taxonomic composition and feeding traits vary with vertical position on the features. A total of 51 morphotypes, each …
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Vertical Distributions of Zooplankton at the Mouth of Chesapeake Bay and Calibration of Backscatter From an Acoustic Doppler Current Profiler
… the physical factors influencing the vertical distribution of zooplankton at the mouth of the Chesapeake Bay and attempted to derive biological data from acoustic Doppler current profiler (ADCP) backscatter. A single site was occupied in the North Channel at the mouth of Chesapeake Bay …
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Adult demography and larval processes in coastal benthic populations : intertidal barnacles in Southern California and Baja California
… in Southern and Baja California. Horizontal and vertical distributions, and the mortality rates of larvae, were assessed from short term (i.e. days) small- scale observations (0.1-1 km) in nearshore waters. Observations on spatial variability of adult barnacle demography were gathered over 1.5 …
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Adult demography and larval processes in coastal benthic populations intertidal barnacles in Southern California and Baja California
… in Southern and Baja California. Horizontal and vertical distributions, and the mortality rates of larvae, were assessed from short tenn (i.e. days) smallscale observations (0.1-1 km) in nearshore waters. Observations on spatial variability of adult barnacle demography were gathered over 1.5 …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… 2, analyses of field observations of ontogenetic vertical distributions of coral reef fish revealed a diversity of behaviors both between and within families. In Caribbean-wide particle-tracking simulations of representative behaviors, surface-dwelling larvae were generally transported longer …
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Effects of landlocked alewife introduction on white bass and walleye populations, Claytor Lake, Virginia
… of eight species of piscivorous fishes. The vertical distributions by season of alewives, channel catfish, white crappie, walleye, and white bass are given. Each of the predator fishes seem to be found in close proximity to the alewife. Changes in the fish fauna of Claytor Lake between 1950 …
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The spatial and temporal abundance patterns of chaetognaths in the western North Atlantic Ocean
… of this thesis was to identify the horizontal, vertical and seasonal abundance patterns of chaetognaths in this region and to relate these patterns to environmental conditions. Twenty one chaetognath species were identified, of which eighteen were abundant enough for analysis of the spatial and …
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Numerical simulation of the effects of sea level rise on estuarine processes
… the tides, currents, and sediment and salinity distributions within estuaries. To see the nature of these effects, a parametric study was performed on the Rappahannock River in Virginia with a two-dimensional, laterally averaged, time-dependent numerical model which simulates the movement of …
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Larval dispersal and population connectivity: implications for offshore renewable energy structures
… play an important role in water column vertical positioning. The importance of vertical positioning to horizontal transport and dispersal of larvae was identified in field surveys of the horizontal and vertical distributions of cirripede larvae, which revealed the interplay of …
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Linking microbial metabolism and organic matter cycling through metabolite distributions in the ocean
… was used to characterize the latitudinal and vertical distributions of particulate and dissolved metabolites in samples gathered along a transect in the Western Atlantic Ocean. The assembled dataset indicates that, while many metabolite distributions co-vary with biomass abundance, other …
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A multi-disciplinary approach to the characterization of waterlogged burial environments : assessing the potential for the in situ preservation of organic archaeological remains
… cm depth, to allow for the examination of the vertical distributions of the variables being studied. Redox potential, water level variation and other physico-chemical parameters were measured down the soil profile. Bacterial abundance was determined by direct counts; activity was assayed by …
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Linking microbial metabolism and organic matter cycling through metabolite distributions in the ocean
… was used to characterize the latitudinal and vertical distributions of particulate and dissolved metabolites in samples gathered along a transect in the Western Atlantic Ocean. The assembled dataset indicates that, while many metabolite distributions co-vary with biomass abundance, other …
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Improving the applicability of metabarcoding to monitor salmon farming impacts on benthic environments
… at farms of two different sediment types. The vertical distributions of bacteria in sub-surface sediments were also assessed along with their function. Sulphur metabolism-related functions were identified as indicators of farm impact. This thesis contributes to the knowledge base required in …
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Distribution patterns of fish during the planktonic period of their life history
… Zealand. Emphasis was given to horizontal and vertical distributions, and these were described on scales encompassing broad areas of the outer Hauraki Gulf and smaller areas of 1 - 100m. The ages of these small fish were also investigated by examining daily increments in the otoliths, and this …
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Lattice Boltzmann modeling for shallow water equations using high performance computing
… is used to solve for each layer coupled by the vertical viscosity forcing term. To increase solution stability, an implicit step is suggested to obtain stratified flow velocities. Numerical examples are presented to verify the multi-layer LB model against analytical solutions. The model’s …
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Distribution, growth, and transport of larval fishes and implications for population dynamics
… 2, analyses of field observations of ontogenetic vertical distributions of coral reef fish revealed a diversity of behaviors both between and within families. In Caribbean-wide particle-tracking simulations of representative behaviors, surface-dwelling larvae were generally transported longer …
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Trace Metal Biogeochemistry in the Western North Pacific
… were analyzed to determine the surface and vertical distributions of Cd, Co, Cu, Mn, Ni Zn and Pb across the western and central North Pacific.</p> <p>Dissolved trace metal concentrations were measured using a novel isotope dilution-ICP-MS method after extraction over an 8-hydroxyquinoline …
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Depositional environments of the upper part of the Sentinel Butte Formation, southeastern McKenzie County, North Dakota
… tabular sand bed, but they have similar vertical distributions of cross-stratification and grain size. </p><p> Yellow- to red-brown sand, silt, and clay beds occur above and adjacent to the three sand beds. The sand, silt, and clay beds become thinner and finer away from the sand beds. …
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