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 15 of 15 for “"coccolithophores"”.
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Trace metal effects on phytoplankton in subpolar seas with special emphasis on coccolithophores
Coccolithophores are a biogeochemically important phytoplankton group, fulfilling an important role in the global carbon cycle through primary production and the formation and export of calcium carbonate. Despite this biogeochemical importance, relatively little is known about their ecophysiology, …
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The effects of light, temperature and nutrients on coccolithophores and implications for biogeochemical models
Coccolithophores are one of the important groups of phytoplankton in the global oceans, which makes it important to know how this group will react to changes in their environment due to climate change. Modellers already recognized their importance and included this group independently in global …
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Coccolithophores in high latitude and Polar regions: Relationships between community composition, calcification and environmental factors
Coccolithophores are a unique group of calcifying phytoplankton that dominate pelagic biogenic calcification and facilitate carbon export. Changes in coccolithophore calcite production through changes in their abundance, species distribution or cellular calcification could affect the oceanic carbon …
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Mineralised phytoplankton community composition in the Scotia and Weddell seas (Southern Ocean), with emphasis on diatoms and coccolithophores Amy Harington.
Phytoplankton community composition in the Southern Ocean (SO) determines levels of primary production, which support marine ecosystems and export of material to the deep sea. Nanoplankton (cell diameters 2-20 μm) are poorly resolved by traditional microscopy, and it is becoming apparent that …
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Seasonal characteristics of phytoplankton bloom phenology in the northern Benguela Upwelling System
… structure of diatoms, dinoflagellates and coccolithophores in the northern BUS. The seasonal cycle of satellite chlorophyll was used to determine the timing of bloom initiation at inshore and offshore boxes that overlapped the in situ stations. An ocean colour algorithm to detect …
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Phytoplankton dynamics in the northeast subarctic Pacific during the 1998 El Niño, the 1999 La Niña and 2000 with special consideration to the role of coccolithophores and diatoms
Phytoplankton dynamics and chemical characteristics of the euphotic zone were measured from 1998-2000 (an El Niño/La Niña cycle) at the 5 major stations along Line P. Near-shelf and offshore stations exhibited low seasonality in chlorophyll and moderate seasonality in particulate organic carbon …
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The role of diatoms in the global carbon cycle
… are highest for mixed-phytoplankton and coccolithophores. Meso-zooplankton, mixed-phytoplankton and diatom abundances are more sensitive to changes in temperature-dependence, while coccolithophores respond more to photosynthesis parameters.
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Determining the Refractive Index of Phytoplankton via Direct Measurement of Cellular Structures
… differentiated by external membrane (Diatoms, Coccolithophores, Dinoflagellates, and Ciliates). Additionally, differences between species were seen in the volume portions of different structures, further necessitating the use of different bulk RIs for different species of phytoplankton. The …
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UNDERSTANDING OF THE VARIABILITY OF PHYTOPLANKTON ECOSYSTEM FUNCTION PROPERTIES: A SYNERGISTIC USE OF REMOTE SENSING AND IN SITU DATA
… diatoms but may benefit smaller plankton such as coccolithophores and/or dinoflagellates. Finally, the knowledge gained though the developed methodological approaches was used to identify/discriminate phytoplankton functional groups (diatoms, dinoflagellates, coccolithophores and …
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Diffraction and Spectroscopy of Marine Calcite Biominerals: Insights into Structure and Geochemistry
… organisms. Organisms such as foraminifera and coccolithophores provide an unparalleled 'proxy’ archive of past marine conditions. The way in which these organisms record these proxy archives is largely unknown, and is a fundamental question in applying and interpreting palaeoclimate proxies. In …
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The combined effect of daylength and CO2 on coccolithophore physiology
… confounded by methodological inconsistencies. Coccolithophores, particularly the species Emiliania huxleyi, are both ecologically and biogeochemically important phytoplankton; however, one strain (NZEH) has produced highly varied results. Here, we present a multivariate analysis that suggests …
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Forcings on Coccolithophore Evolution and Assemblage Changes
… and abrupt climate change, with a focus on coccolithophores—a calcifying marine phytoplankton group. Coccolithophore assemblage analysis of annually laminated sediments from the northeastern Arabian Sea spanning the last century reveals their sensitivity to changes in the Indian monsoon …
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Understanding ocean iron dynamics and impacts on marine ecosystems
… Indian Ocean, compensated by increases in coccolithophores growth and carbonate carbon export. These changes lead to a decrease in the carbon dioxide uptake over the Indian Ocean.
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Phytoplankton growth and diel variations in beam attenuation through individual cell analysis
… ultraphytoplankton, nan~phytoplankton, and coccolithophores. Assuming that division was phased, specific growth rates were estimated based on volume and carbon changes between minimum and maximum values over the day. Phytoplankton group-specific loss rates, and also separate day and night …