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 11 of 11 for “"Picoplankton"”.
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Short-term dynamics of nano- and picoplankton in the southern Benguela upwelling system
… These environmental changes can influence picoplankton (0.3–3 µm) and nano-picoplankton (0.3–10 µm) at different time scales; in this thesis daily changes were of interest because of the cyclic (3–7 days) nature of wind-driven upwelling. Daily variability of picoplankton was studied during …
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Seasonal and Diel Patterns of Abundance and Productivity of Phototrophic Picoplankton in the Lower Chesapeake Bay
… Chesapeake Bay. A 15 month study of phototrophic picoplankton abundance and productivity was made from June 1988 to October 1989. Annual picoplankton abundance using epifluorescence microscopy ranged from 7.26 x 10<sup>6</sup> cells/1 in the winter to 9.28 x 10<sup>8</sup> cells/1 during late …
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FLOW CYTOMETRIC INVESTIGATION OF THE SIZE SPECTRUM OF NORTH SEA PHYTOPLANKTON COMMUNITIES
… (<200 μm), nanoplankton (2-20 μm) and picoplankton (≤ 3 μm). Differences in cell volume govern variations in carbon content, nutrient uptake and influence cell fate. Reduced diameters equate to lower sedimentation rates and promote participation within the microbial loop and recycling …
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Dimensions of microbial biodiversity in the North Pacific subtropical Gyre
… in the abiotic environment, using near monthly picoplankton samples collected across a 2-year period at 25m depth, we observed that microbial community composition correlated with solar irradiance, thereby demonstrating seasonal trends. Ocean surface microbes are known to differ fundamentally …
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The relative role of protozoans in the flux of phytoplankton nitrogen through pelagic food webs
… size classes of phytoplankton (net-, nano-, and picoplankton) was measured using ¹⁵N isotope techniques. Microzooplankton grazing on autotrophic picoplankton and nanoplankton was quantified by predator:prey dilution experiments. Between 7 and 52 copepods in species assemblages representative of …
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Picophytoplankton photoacclimation and mixing in the surface oceans
… cell optical properties for the photosynthetic picoplankton, Prochlorococcus spp. Diel time-series observations from the Sargasso Sea reveal patterns in single-cell fluorescence distributions within Prochlorococcus spp. populations which appear to correspond to decreasing mixing rates and …
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Organic Copper Binding Ligands and Thiol Compounds Produced by Bacteria and in the Elizabeth River, Virginia
… in abundance of bacterioplankton, autotrophic picoplankton, and chlorophyll a, suggesting a biological source. Data indicate thiol compounds contribute to the ligand pool with conditional stability constants (log K′<sub>CuL</sub>) between 11.7–12.6.</p> <p>A simple box model was developed for …
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Persistent pharmaceutical concentrations in an urban Western Cape Estuary and the effects on microalgal assemblages
… pelagic microalgae biomass, where micro- and picoplankton declined with sulfamethoxazole concentrations but nanoplankton and benthic microalgae was unaffected. The high levels of pharmaceuticals found in the Zandvlei Estuary are likely a result of increasing sewage spills due to malfunctioning …
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Characterization of swimming motility in a marine unicellular cyanobacterium
… microaggregates may play an important role in picoplankton nutrient dynamics.
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The role of heterotrophic microflagellates in plankton communities
… abundance of microflagellates relative to other picoplankton (0.2-2.0 μm) and nanoplankton (2-20 μm) populations in water samples in the North Atlantic and in Lake Ontario and on macroaggregates in the North Atlantic was determined using direct microscopical and culture estimation techniques. …