Global ETD Search
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Showing 1 to 15 of 15 for “"Microplankton"”.
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Detailed studies of the Callovian and Oxfordian microplankton from the Warboys and Warlingham boreholes
… and palaeoenvironmental analyses of microplankton assemblages from the Kellaways Beds and Oxford Clay (Upper Jurassic) of the Warboys and Warlingham Boreholes, based on 118 samples. Chapter one sets out the aim of the study as being (i) to evaluate the significance of microplankton …
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Organic-walled microplankton paleoecology and biostratigraphy of the Upper Cretaceous Ripley Formation, southwestern Georgia
This study documents the occurrence of dinoflagellate, chlorophyte, and acritarch cysts from the Upper Cretaceous upper Cusseta, Ripley, and lower Providence Formations in the USGS Fort Gaines core, drilled in Clay County, Georgia. A total of 75 taxa were identified, consisting of 36 genera, 61 …
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Interactive effects of temperature, nutrient level and sandprawns (Kraussillichirus kraussi) ecosystem engineering on microplankton community structure
Global warming and eutrophication are leading global change stressors that threatened coastal environments. Water quality degradation has gained scientific attention in particular, especially from the perspective of finding nature-based solutions (NBS) to microbiological proliferation. Endobenthic …
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Organic-walled microplankton biostratigraphy and paleoecology of the Maastrichtian Prairie Bluff Chalk formation of central and western Alabama
Marine organic-walled microplankton biostratigraphy of the Maastrichian Prairie Bluff Chalk is documented. A total of 69 dinoflagellate species were identified in the Prairie Bluff Chalk. Samples were studied from three sites in central and western Alabama (Tombigbee River, Millers Ferry, and …
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Forcings on Coccolithophore Evolution and Assemblage Changes
Marine microplankton play an integral role on Earth, not only in supporting entire ecosystems but also in affecting fundamental components of the climate system. However, our understanding of the factors driving microplankton evolution and assemblage changes is still incomplete. Here, I explore how …
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A palynological investigation of Upper Jurassic basal Cretaceous sediments from England, France and Iberia
… ha ve considerable potential for sourcing oil. Microplankton assemblages (dinoflagellate cysts and acritarchs are recorded and described from the English and French sections which are well dated upon independent palaeontological evidence. The various taxa constituting the microplankton …
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Limnological investigations of a natural, subalpine lake in the early stages of eutrophication: Mountain Lake, Giles County, Virginia
… of K₂HPO₄ and/or NH₄NO₃ in the pico-, nano-, and microplankton size classes. The smaller size fractions (picoand nanoplankton) responded more strongly to the N enrichment, whereas the microplankton responded more with the P enrichment. In all cases, ammonium-N was the preferred inorganic nitrogen …
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Palynological investigations of Cenomanian chalks and marls from England
… largely diverse and abundant, well-preserved microplankton assemblages. Four sections have been investigated, three from the Dover-Folkestone Warren area, south-east England and the fourth from South Ferriby, South Humberside, north-east England. The dinoflagellate cysts present accord well …
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Nano- e microfitoplâncton da Baía de Guanabara (RJ, Brasil) em condições tróficas distintas: aspectos estruturais e pré-funcionais
… nanoplankton and 10^5 - 10^7 cells. L^-1 for the microplankton, while biomass values varied around 10^2 - 10^3 μgC. L^-1 and 10 - 10^3 μgC. L^-1, respectively. At Urca, lower relative and absolute abundances of heterotrophs were also found. The species list for the microphytoplankton included 168 …
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FLOW CYTOMETRIC INVESTIGATION OF THE SIZE SPECTRUM OF NORTH SEA PHYTOPLANKTON COMMUNITIES
… into functional types based on cell size: microplankton (<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 …
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A size-based model of carbon and nitrogen flows in plankton communities
… principles, it can be used to simulate microplankton community interactions in any planktonic ecosystem. Two coastal ecosystems from the southern Benguela region in South Africa are simulated; one typical of the relatively stable surface waters on the Agulhas Bank and one typical of …
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The relative role of protozoans in the flux of phytoplankton nitrogen through pelagic food webs
… budget the nitrogen flux through the different microplanktonic compartments leading to copepods. Uptake of nitrate and ammonium by three different size classes of phytoplankton (net-, nano-, and picoplankton) was measured using ¹⁵N isotope techniques. Microzooplankton grazing on autotrophic …
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Emiliania huxleyi and climate change: a genetic and biogeographic investigation of bloom dynamics for a key phytoplankton species in the global carbon cycle
… large diatoms and E. huxleyi, and a number of microplankton (20 – 200 ?m) diatom species. Overall, the work contributes substantially to our understanding of the molecular population structure, extent of phenotypic plasticity, and environmental parameters affecting the key phytoplankton E. …
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Fish spawning strategies in the variable southern Benguela Current region
… from 5 depths down to a maximum depth of 75m. Microplankton (37-100 μm fraction) particle concentration, chlorophyll concentration and salinity were determined from the samples. A vertical temperature profile was obtained at each station using a bathythermograph. Twenty plastic drift cards were …
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Investigations into the seasonal deep chlorophyll maximum in the western North Atlantic, and its possible significande to regional food chain relationships
… of the DCM had more total biomass and more microplankton biomass than above and below. Further, at DCM depths, the abundance of particular zooplankton functional groups appeared to reflect the size of the dominant phytoplankton. Not only presumed herbivores but a purely carnivorous group, …