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 46 for “"phytoplankton blooms"”.
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Climate impact on phytoplankton blooms in shallow lakes
… understanding of climate impacts on freshwater phytoplankton, which forms the basis of the food chain and decisively influences water quality. The analyses were, for the most part, based on a long-term data set of physical, chemical and biological variables of a shallow, polymictic lake in …
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The development and decline of phytoplankton blooms in the southern Benguela upwelling region
… estimates reported for other upwelling areas. Phytoplankton biomass in the upper 50 metres ranged between 8 and 506 mg phll �- m- 2 (mean 208 mg chll �.m- 2); on average, about half the biomass occurred below the 1% light level indicating that self-shading is an important factor limiting …
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Application of machine learning methods to predict phytoplankton blooms and determine microbial biomarkers using marine microbiomes
… between bacterioplankton and coastal phytoplankton blooms is key to understand coastal ecosystems functioning, which are the most productive areas for fisheries. With that knowledge, we could predict and may be mitigate, the effects of global change or contamination events in these …
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A turbulent diatom vs dinoflagellate phytoplankton biomass model
Phytoplankton blooms play an important role in global primary productivity and the dynamics of blooms are of interest to modellers. Diatom dominated phytoplankton blooms followed by dinoflagellate blooms are common in the Southern Benguela, and are often associated with Harmful Algal Blooms. A …
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A potential mechanism sustaining the biological hotspot around Palmer Deep Canyon
… of warm, nutrient-rich water was fueling phytoplankton blooms in the area. These phytoplankton blooms would support Antarctic krill (Euphausia superba) in the region who feed on the phytoplankton blooms occurring over the canyon, providing a reliable food source for marine predator …
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Air-sea CO2 cycling in the southeastern Beaufort Sea
… by a slow increase over the winter until spring phytoplankton blooms caused strong undersaturation at break–up. Over the summer, pCO2sw increased until becoming slightly supersaturated due to surface warming. Along the southern margins of Amundsen Gulf and on the Mackenzie Shelf we found pCO2sw …
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Dynamics and variability of the Subantarctic mixed-layer as determined from a high resolution glider dataset
… shown to result in the early onset of spring phytoplankton blooms at high latitudes. To date these ML eddies have been researched primarily in models with few observational studies available. To test the ML eddy hypothesis in the Subantarctic Zone (SAZ) we use high-resolution (~3km, 4-hourly) …
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Partitioning the influence of anthropogenic and oceanic nutrient fluxes in the coastal ocean, and the question of cultural eutrophication
… in the frequency and magnitude of marine phytoplankton blooms along the eastern Australian coast off New South Wales. This coastal region is frequently impacted by the western boundary flow of the East Australian Current (EAC), and anthropogenic discharges from major estuaries, and sewage …
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Seasonal and interannual variability of the marine carbonate system at the ice shelf in the eastern Weddell Gyre and its sensitivity to future ocean acidification
… Eastern Weddell Gyre (EWG), seasonal summertime phytoplankton blooms were a critical factor in the observed decrease in summer surface water CO 2 and the subsequent increase in summer surface water Ωarag.
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The biogeochemistry of marine nitrous oxide
… such as nitrifier cell abundances and coastal phytoplankton blooms that may influence N2O production by ammonia oxidizers as well. Ammonia oxidizers can produce N2O through two separate biochemical mechanisms that have unique isotopic signatures. Using culture- based measurements of these …
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Quantifying spatial and temporal scales of phytoplankton variability in the Sub-Antarctic Ocean using a high-resolution glider dataset
Phytoplankton in the Sub-Antarctic Southern Ocean have a distinct seasonal cycle, which is highly variable in both space and time. The seasonal and spatial distribution of chlorophyll can be attributed to the complex nature of the physical and biogeochemical factors controlling phytoplankton …
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The biogeochemistry of marine nitrous oxide
… such as nitrifier cell abundances and coastal phytoplankton blooms that may influence N₂O production by ammonia oxidizers as well. Ammonia oxidizers can produce N₂O through two separate biochemical mechanisms that have unique isotopic signatures. Using culture-based measurements of these …
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Carbon export from natural iron fertilisation in the Southern Ocean
… which is an essential<br/>micronutrient for phytoplankton growth. In HNLC regions biological production can be<br/>enhanced with artificial mesoscale iron fertilisation. However, the ability of artificially<br/>induced phytoplankton blooms to efficiently sequester carbon to mesopelagic depths …
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Iron and Prochlorococcus/
… scale we understand how iron addition induces phytoplankton blooms through meso-scale iron-addition experiments. At the atomic scale, we can describe the length and type of bonds that connect iron atoms to components of photosystem I, the most efficient light-harvesting complex in nature. Yet, …
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Distributed autonomy and formation control of a drifting swarm of autonomous underwater vehicles
… highly dynamic oceanographic phenomena such as phytoplankton blooms and the use of an AUV swarm as a virtual acoustic receiver for sea-bottom seismic surveying or the monitoring of naturally occurring acoustic radiation from cracking ice. However, the limitations of the undersea environment …
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Seasonal characteristics of phytoplankton bloom phenology in the northern Benguela Upwelling System
Seasonal phytoplankton blooms in the Benguela Upwelling System (BUS) play a crucial role in ecosystem services and driving climate change through air-sea gas exchanges. Upwelling systems are particularly are sensitive to effects of climate change including the transport of nutrients, which …
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Distributed autonomy and formation control of a drifting swarm of autonomous underwater vehicles
… highly dynamic oceanographic phenomena such as phytoplankton blooms and the use of an AUV swarm as a virtual acoustic receiver for sea-bottom seismic surveying or the monitoring of naturally occurring acoustic radiation from cracking ice. However, the limitations of the undersea environment …
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Biology and potential biogeochemical impacts of novel predatory flavobacteria
… on animals, the degradation and lysis of phytoplankton blooms and, now, predation on bacterial communities. Strains from the two genera were found to exhibit divergent prey specificities and growth yields when growing predatorily. Olleya sp. predatory cells accumulated to an order of …
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Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… with nutrients, resulting in strong summer phytoplankton blooms and the sustenance of one of Europe’s largest fisheries. The episodic nature of these upwelling events result in considerable challenges studying the region using traditional shipboard observations. This thesis demonstrates an …
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