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 13 of 13 for “"Marine plankton"”.
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The production of non-methane hydrocarbons by marine plankton
… source for many alkenes, and a phytoplanktonic source for isoprene. The focus of this thesis was to gain further insight on marine microbiological cycling of NMHC. This included investigations on two main themes. The first was the effect of different physiological conditions on …
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Size distributions, population dynamics, and single-cell properties of marine plankton in diverse nutrient environments
… relationship between the community structure of marine microorganisms and nutrient availability. To this end, size spectra of microbes were studied over a range of nutrient regimes, both natural and manipulated. Three transects in the Atlantic provided a natural range of nutrient environments, …
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Plankton studies of the Tomales Bay, California
<p>These studies on the plankton of Tomales Bay were designed to determine the effects of such physical factors as tides, temperatures, salinities and sunshine on the quantities of various types of organisms, and to obtain a more comprehensive picture of estuarine life at the Pacific Marine …
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Underwater Refractive Camera Calibration and 3D Scene Reconstruction
… oceanic applications, including quantifying marine parameters, spatially mapping the seafloor, and digitally documenting plankton. Given that the majority of Earth's surface lies in deep-sea regions, achieving these objectives necessitates the use of unmanned vehicles equipped with waterproof …
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Functional and Molecular Diversity of the Diatom Family Leptocylindraceae
… regarding the ecology and evolution of phytoplankton. A wide range of tools, spanning from microscopical observations and physiological measurements to molecular techniques and high throughput sequencing, is utilized during this attempt. The genus <i>Leptocylindrus</i> has been chosen as the …
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Triple oxygen isotopes and oxygen/argon ratio measurements to enhance coastal and open ocean production/respiration comparisons
The accurate measurement of marine plankton production is required to constrain the global carbon balance. Traditional methods rely on bottle incubations, which are thought to underestimate plankton production. This study presents in situ measurements of gross oxygen production (G) derived from …
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Planktonic foraminifera in the sea of Okhotsk : population and stable isotopic analysis from a sediment trap
The relationship of planktonic foraminiferal populations and stable isotopes to synoptic sea surface temperatures (SST's) was examined in the Sea of Okhotsk, using sediment trap samples (trap deployed Aug. '90 - Aug. '91; 53°19'N, 149°50'E) and AVHRR satellite sea surface temperature data. Synoptic …
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Palynological insights into the Mid Jurassic dinoflagellate radiation
… eukaryotes, the majority of which are marine plankton, and are one of the most important groups of primary producers in the world’s oceans. The dinoflagellate fossil record is based on their zygotic resting cysts; this record indicates that the Bajocian of the Mid Jurassic (~170–168 Ma) …
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The influence of differential production and dissolution on the stable isotope composition of planktonic foraminifera
Planktonic foraminifera from plankton tows, sediment traps and sediments from the central North Atlantic were studied in order to understand how they acquire their oxygen and carbon isotope compositions. Shallow dwelling planktonic foraminifera (mostly spinose species), collected in plankton tows …
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Structural characterization and bacterial degradation of marine carbohydrates
… of carbohydrate degradation by anaerobic marine bacteria. Polysaccharides produced by five species of marine plankton, Dunaliella tertiolecta, Emiliania huxleyi, Stephanopixis palmeri, a Phaeocystis sp., and Synechococcus WH7335, were surveyed using one- and two-dimensional nuclear …
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Microbial size spectra from diverse marine ecosystems
… of microbial size spectra (bacteria and phytoplankton) were examined in relation to changes in ecosystem productivity and environmental perturbations. Samples were obtained from productive coastal waters in Massachusetts and Cape Cod Bays, oligotrophic waters in the Sargasso Sea and high …
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Plankton dynamics of the open Southern Ocean and surrounding the (Sub)Antarctic islands
… ~30-40% of global ocean CO2 absorption annually. Marine plankton play a major role in the Southern Ocean CO2 sink as they fix dissolved atmospheric CO2 into organic carbon biomass, much of which supports the ocean food web and a portion of which sinks into the ocean interior, thereby removing …
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Modeling Nutrient and Plankton Processes in the California Coastal Transition Zone
… spatial and temporal development of nutrient and plankton distributions in the CTZ. The first of these models considers only time- and vertical processes at specific locations in the CTZ. The model food web components include: silicate, nitrate, ammonium, two phytoplankton size fractions, …