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 14 of 14 for “"biomass distribution"”.
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Benthic microalgae on the Louisiana inner continental shelf: biomass, distribution, and contribution to benthic food-webs
… of sediment microalgae to investigate how the biomass, composition, and degradation state of sediment-associated microalgae varies along the Louisiana inner shelf across a continuum of water column and sediment conditions. The contribution of microalgae to higher trophic levels was also …
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Reef fish demographics on Louisiana artificial reefs : the effects of reef size on biomass distribution and foraging dynamics
… to examine high-resolution spatial and temporal distribution around two standing and two toppled platforms, and to examine the trophic ecology of common reef-associated fishes, such as red snapper (Lutjanus campechanus). Spatial distribution of fish biomass was examined using a multifrequency …
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Investigation of some characteristics of the Nitella population in Mountain Lake, Giles County, Virginia
… with depth, pigment content changed with depth, biomass distribution had decreased since an earlier study, primary productivity was low and was associated with the depth of maximum biomass and pigment content, and the furcations of the branchlets increased in shallower water.
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The influence of macrofauna on intertidal sediment stability and biogeochemical properties.
… and relative erosion rate, microphytobenthos biomass and health, sediment particle size and size distribution, sediment water content, chlorophyll a and b concentration, and colloidal carbohydrate concentration. Mudflat sediment macrofaunal biomass was removed using cryo-defaunation and the …
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Systems informatics and analysis for optimization of biomass feedstock provision
… How to develop an efficient and effective biomass production and provision system is important for successful large-scale biofuels production. The overall objective of this dissertation is to develop multiple-scale supply chain optimization models and decision support tools to facilitate …
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The Growth and Activity of Genetically Diverse Prochlorococcus
… to the Eubacterial community and described the biomass distribution (rDNA) and activity (rRNA) patterns from two representative depths (25 and 100 m) at a well-studied oligotrophic ocean station. These results show that for some populations the abundances and activities are significantly …
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Investigating and modelling the body size structure of benthic communities
… were investigated in terms of their body size distributions at three environmentally contrasting study sites: (i) a shallow-water location on the Fladen Ground, North Sea, (ii) a deep-water location in the Faroe-Shetland Channel and (iii) and a mid-slope oxygen minimum zone location on the Oman …
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Optimization of an integrated grain-biomass-ethanol supply chain with event-based decision-making
… of renewable technologies. When considering biomass for fuel production, farm and distribution management become key in turning such renewable alternatives into successful large-scale systems. This research effort proposes an integrated approach to a grain-biomass-ethanol supply chain, with …
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Evaluation of Prairie Cordgrass (Spartina pectinat, link) for Biomass Production on Marginal Land
<p>Biomass is a renewable resource that offers many advantages to a successful perennial grass-based bioenergy model. Many of today’s economic problems have led scientists and farmers to search for new crops that increase agricultural sustainability and profitability. The use of bioenergy crops …
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Distribution and Characteristics of Biomass in an Upflow Biological Aerated Filter
The biomass from a pilot-scale two-stage (carbon oxidation first stage, ammonia oxidation second stage) fixed-film biological aerated filter (BAF) was divided in three fractions depending on their attachment strength to the media: detached, easily detachable and strongly attached. VSS measurement …
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Effects of light and nutrient gradients on the taxonomic composition, size structure and physiological status of the phytoplankton community within a temperate eutrophic estuary
… parameters and phytoplankton carbon biomass.<br/><br/>The phytoplankton populations at the four stations were relatively similar. Maximum values of chlorophyll (chl) and carbon biomass were observed between May and August in both years, with a late diatom bloom in 2002, and a mid …
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The role of life history traits for coexistence and forest recovery after disturbance – a modelling perspective. Towards a better understanding of species-rich forests
… of complexity (e.g. basal area and stem size distribution). We then use this forest model to investigate the influence of landslide disturbances on forest dynamics both on the local scale of a single landslide and on the landscape scale. On landslide sites, changes in environmental conditions …
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Bio-physical controls on tidal network geomorphology
… control on network evolution depending on their biomass distribution within the tidal frame. However, tidal channel morphodynamcis appears to be sensitive to the way biomass growth is mathematically parameterised in the model. In view of the current challenges in transcribing mathematically such …
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3D SENSING APPROACHES FOR PRECISION AGRICULTURE: APPLICATIONS TO PLANT FEATURES CHARACTERIZATION AND TO WEED CONTROL IN MAIZE
… characterization of plant geometric properties, biomass estimation with non-destructive methods and discrimination between crops and weeds for use in precision agriculture applications. Following an introductory section, the first part of the work, which corresponds to Chapters 3 and 4, involves …