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 347 for “"Blooms"”.
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Predicting estuarine algal blooms using artificial neural networks
… a tributary of the Hawkesbury River, NSW. Algal blooms in this estuary are a regular feature of seasonal cycles and develop in response to non-periodic disturbances. Toxic algae, mostly Dinophyta, have led to fish kills and estuary closure. Most non-toxic algae present are from the division …
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Climate impact on phytoplankton blooms in shallow lakes
… by lengthening the growing period advanced algal blooms and consequently also peaks in zooplankton abundance. Investigating the reasons for the contrasting development of cyanobacteria during two recent summer heat wave events revealed that anomalously hot weather did not always, as often …
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The bio-optical detection of harmful algal blooms
… designed for the detection of harmful algal blooms. The adopted framework focuses on establishing quantitative relationships between optically important algal intracellular properties and inherent optical properties (IOPs), such as the absorption and backscattering coefficients, and the …
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Nitrogen nutrition of harmful algal blooms in upwelling systems
Blooms of toxic, or otherwise harmful phytoplankton species are known to occur in eastern boundary upwelling systems, coincident with the relaxation of upwelling in late<br/>summer/autumn. Field studies were carried out in 3 consecutive summers (March/April 06-08)<br/>in the Benguela and in the …
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Study of the Origins of the Sigma-0 Blooms
… These phenomena have been referred to as sigma-0 blooms, and are accompanied by an increase in noise in the significant wave height (SWH) and altitude measurements. Since approximately 5% of all data recorded by the satellite contains sigma-0 blooms, it is important to understand their causes so …
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Dinoflagellate blooms and physical systems in the Gulf of Maine
Numerous studies have shown dinoflagellate blooms to be closely related to density discontinuities and fronts in the ocean. The spatial and temporal patterns of the dinoflagellate population depend on the predominant mode of physical forcing, and its scales of variability. The present study …
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Measuring and modelling estuarine macroalgae blooms and water column nutrients
… examines the dynamics of estuarine macroalgae blooms of the genus Ulva and the environmental factors controlling them, using process-based mathematical models as well as observation data from Tauranga Harbour (North Island, New Zealand). Based on long-term monitoring datasets of water column …
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Assessing the risk to aquaculture from Harmful Algal Blooms (HABs)
Harmful Algal Blooms (HABs) occur worldwide with regionally based differences in their<br/>occurrences. Some of these events have human health consequences due to associated<br/>shellfish poisoning symptoms after consumption of contaminated organisms. Negative<br/>economic implications from HABs …
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Landscape and climate drivers of harmful algal blooms in Iowa
1 PDF file (viii, 74 pages)
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Improving the predictability of harmful algal blooms around the Shetland Islands
Toxin producing harmful algal blooms (HABs) are one of the principal challenges facing the shellfish aquaculture industry. This is important because biotoxins are a serious threat to human health. Symptoms of algal toxin poisoning can range from the embarrassing and debilitating to neurological …
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Quantitative Mapping of Cyanobacterial Blooms Using Oceansat-1 OCM Satellite Data
… for remote characterization of cyanobacteria blooms because of their seasonal occurrence. This dissertation makes a contribution to research methodology pertaining to atmospheric correction of satellite data and development of remote sensing algorithms to quantify cyanobacterial pigments. The …
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Harvesting natural algal blooms for concurrent biofuel production and hypoxia mitigation
… of harvesting detrimental environmental algal blooms and conversion of the harvested biomass into biofuels. An engineering model was developed to compare the energy efficiency of different harvesting methods and biofuel conversion techniques. The modeling data was largely compiled from a …
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Effects of hydrothermal liquefaction on algal toxins from harmful algae blooms
The formation of harmful algae blooms (HABs) in natural waters is an intensifying issue throughout the world and poses risks to the environment due in part to the toxins they release. A promising mitigation technique is to physically collect the HABs from the environment and convert them into …
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Dynamics and impacts of toxic Alexandrium catenella blooms in the Pacific Arctic
… is facilitating the emergence of harmful algal blooms (HABs) in polar waters, posing a significant threat to northern communities and ecosystems. Of particular concern is the dinoflagellate Alexandrium catenella, a cystforming species that produces a potent suite of paralytic shellfish toxins …
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Environmental Monitoring of Cyanobacterial Harmful Algal Blooms Using Small Unmanned Aerial Systems
Cyanobacterial harmful algal blooms (CHABs) degrade water quality and may produce toxins. The distribution of CHABs can change rapidly due to variations in population dynamics and environmental conditions. Biological and ecological aspects of CHABs were studied in order to better understand CHABs …
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Cyanobacterial Harmful Algal Blooms Vary Within and Across Years at Lake Fayetteville, Arkansas
<p>The occurrence of cyanobacterial harmful algal blooms (HABs) and toxins are a nationwide concern. Although Lake Fayetteville likely experienced HABs for many years, microcystin, an algal toxin, was not monitored until 2019. The objectives of this study were to: 1) observe temporal variation in …
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Exploring undergraduate students’ topic interest, topic knowledge, and attitudes regarding harmful algal blooms
<p>Harmful algal blooms (HABs) are a growing concern in the US and abroad. Persistent misconceptions regarding HABs can increase the negative effects of bloom events by decreasing the effectiveness of communication efforts and impeding mitigation, monitoring, and recovery efforts. Addressing the …
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Sediment Resuspension in a Microtidal Estuary: Causative Forces and Links with Algal Blooms
… species diversity has increased, however, algal blooms (primarily dinoflagellates) persist, occurring nearly every summer. Dinoflagellates produce resting cysts that accumulate in the bottom sediments and are thought to provide seed populations for future algal blooms when they are resuspended. …
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The development and decline of phytoplankton blooms in the southern Benguela upwelling region
[page ii, 27 missing] These "Redfield productivity 14 estimates" were similar to C-uptake productivity but lower than estimates obtained from changes in particle volume. If the period of maximum nutrient decrease was used for the calculations, the "Redfield productivity 14 estimates" lie between …
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