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 17 of 17 for “"Microzooplankton"”.
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Microzooplankton Dynamics in Lower Chesapeake Bay and Its Major Tributaries
… the temporal and spatial variability of microzooplankton density and biomass at 14 stations located within Chesapeake Bay and four rivers. Microzooplankton are defined as those heterotrophic organisms which range from 20 to 200 $\mu$m in size, and in this study were mainly composed of …
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Effects of Selective Grazing by Microzooplankton on Phytoplankton Composition in a Subtropical Estuary
<p>Rates of phytoplankton growth and microzooplankton grazing were measured at two locations within the Bay of St. Louis, MS, over the course of three months to explore the dynamics of the phytoplankton community. Community growth rates were estimated based on the changes in chlorophyll a (chl a) …
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The relative role of protozoans in the flux of phytoplankton nitrogen through pelagic food webs
… 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 the natural communities were incubated in 11 samples of …
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Endobenthic Ecosystem Engineering: influence of sandprawns (Callichirus kraussi) on zooplankton assemblages
… of zooplankton assemblages; mesozooplankton and microzooplankton, based on the premise that water pumping activities would lead to a decline in abundance of phytoplankton (adsorption onto burrow walls), thereby, resulting in negative bottom-up effects on zooplankton assemblages. This aim was …
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The biogeochemistry of lipid derived infochemical signals in the ocean
… bloom decline and viruses, and oxylipins deter microzooplankton grazing. Sinking particles collected in the North Atlantic were determined to be hot spots for PUAs with concentrations in the micromolar range. Natural particle associated microbial communities exhibited a dose dependent response …
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The biogeochemistry of lipid derived infochemical signals in the ocean
… bloom decline and viruses, and oxylipins deter microzooplankton grazing. Sinking particles collected in the North Atlantic were determined to be hot spots for PUAs with concentrations in the micromolar range. Natural particle associated microbial communities exhibited a dose dependent response …
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Microbial food web interactions in two Long Island embayments
… revealed high energy flux through the nano- and microzooplankton assemblages of these estuarine environments.
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Microbial food web interactions in two Long Island embayments
… revealed high energy flux through the nano- and microzooplankton assemblages of these estuarine environments.
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Population Dynamics and Pattern Formation in an Info-chemical Mediated Tri-trophic Plankton Model
… model. In the latter, the grazing pressure of microzooplankton (M) on phytoplankton (P) is controlled through external infochemical (C) mediated predation by copepods (Z). We undertake a stability analysis of both the two species model and the four species model and compare the system dynamics. …
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Os copépodes na região de Cabo Frio: variação qualitativa e quantitativa, durante um ciclo de ressurgência, Rio de Janeiro, RJ, Brasil
… b) collection with van Dorn bottle to study the microzooplankton. FFifty five copepod species were identified. Paracalanus parvus, Calanoides carinatus, Oithona plumifera, Oncaea media e Temora stylifera were the most abundants. Quantitatively, tall size classes copepods contributed to the …
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Ocorrência, distribuição e reprodução de Cladocera (Crustacea: Branchiopoda) na Baía de Guanabara - RJ, Brasil
… in November, period of relative higher microzooplankton densities in study region. These two species exhibited a marked seasonal variation in their planktonic occurrence: Penilia avirostris disappeared of plankton from May to August, while Evadne tergestina was absent oneself in August …
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Nutritional regulation of egg production of Calanus Finmarchicus in the North Atlantic
… ingestion rates, a method to account for microzooplankton grazing in particle removal experiments was developed.<br/>Balanced physiological budgets were compiled for C. finmarchicus in both seasons. The input terms of these budgets consisted of ingestion and the use of biomass, and the …
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Bacterioplankton dynamics in the Southern Benguela upwelling region
… copepods may switch to omnivory, ingesting microzooplankton of the microbial food web, and stimulating enhanced remineralisation to further sustain primary production. A generic size-based simulation model of the dynamics of the plankton community indicated that bacteria and the microbial …
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A model of copepod population dynamics in the southern Benguela upwelling region
… the role of major size-class groups, such as the microzooplankton and macrozooplankton, in mediating the flow of energy from phytoplankton to fish.
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OVERLOOKED AND UNDERSTUDIED: A SURVEY OF THE SMALL AND HIDDEN FRESHWATER INVERTEBRATE TAXA (PHYLUM ROTIFERA AND SUBPHYLUM CRUSTACEA)
During a 2018 parasitic crustacean survey of Oneida Lake, four adult female specimens of the Asiatic parasitic copepod Neoergasilus japonicus (Harada, 1930) were collected, one specimen was from a white sucker (Catostomus commersonii), another from a green sunfish (Lepomis cyanellus), and two from …
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Particulate fluxes in the subtropical convergence region and other marine environments of New Zealand
… of organic material out of surface layers. Microzooplankton grazing of organic material is likely to be important in preferentially increasing particle residence times in the upper ocean. This mechanism may be concomitant with other processes including bacterial decomposition, …