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 12 of 12 for “"Phaeocystis"”.
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Characterizing cobalamin cycling by Antarctic marine microbes across multiple scales
… two keystone phytoplankton types: diatoms and Phaeocystis antarctica. This thesis investigates microbe-driven cobalamin cycling in Antarctic seas across multiple spatiotemporal scales. I conducted laboratory culture experiments with complementary proteomics and transcriptomics to investigate …
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Feeding, Dark Survival, and Foreign Organelle Retention in an Antarctic Dinoflagellate
… (RSD) retains plastids from its haptophyte prey Phaeocystis antarctica. It is a member of the Kareniaceae, a dinoflagellate family whose other members all contain permanent tertiary plastids of haptophyte origin. A subset of its cells also contain foreign nuclei. The following chapters describe …
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Physiological characterization and molecular ecological investigation of diverse organisms of the Roseobacter clade isolated from the North Sea
… In Experimenten mit den Phytoplanktonalgen Phaeocystis globosa und Leptocylindrus danicus konnte die bakterielle Verwertung von durch Algen produzierten gelösten organischen Kohlenstoff gezeigt werden.
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Variabilité des concentrations cellulaires phytoplanctoniques de diméthylsulfoniopropionate (DMSP) et de diméthylsulfoxyde (DMSO) en Baie Sud de la Mer du Nord
… Sea has been benefitting to the prymnesiophyte Phaeocystis globosa (P. globosa). This species is a known high dimethylsulfoniopropionate (DMSP) producer whose bloom accounts for 95% of spring phytoplankton biomass. An increase in DMS(P) and its oxidation product dimethylsulfoxide (DMSO) cellular …
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Effect of future CO2 and temperature regimes on phytoplankton community composition, biomass and photosynthetic rates in the western English Channel
… of the harmful algal bloom (HAB) species, Phaeocystis in spring and autumn, while the combination of elevated pCO2 and temperature promoted biomass of the HAB species, Prorocentrum minimum in autumn. The results indicate that experimental simulations of year 2100 pCO2 and temperature may …
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Cellular viability and the occurence and significance of chlorophyll allomers during phytoplankton turnover.
… Peaks in allomers were associated with blooms of Phaeocystis spp., Guinardia delicatula, Chaetoceros socialis and Emiliania huxleyi and associations were dependent on the cause of the taxas’ declines. In situ allomer measurements were also taken during a research cruise in the central and southern …
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Characterizing cobalamin cycling by Antarctic marine microbes across multiple scales
… two keystone phytoplankton types: diatoms and Phaeocystis antarctica. This thesis investigates microbe-driven cobalamin cycling in Antarctic seas across multiple spatiotemporal scales. I conducted laboratory culture experiments with complementary proteomics and transcriptomics to investigate …
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, sources and cycling
… weissflogii, Emiliania huxleyi and Phaeocystis, were cultured in seawater and their HMW DOM exudates examined by variety of analytical techniques. Both the T. weissflogii and E. huxleyi exudates contain compounds that resemble APS indicating that phytoplankton are indeed a source of …
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Antarctic phytoplankton and climate change using Holocene sedimentary DNA, fossils and chemical proxies.
… in the older part but sedaDNA reveals recent Phaeocystis dominance and documents very recent phytoplankton turnover associated with enhanced melt. Together, the chapters provide an integrated late-Holocene perspective on how WAP climate forcing reorganises Southern Ocean ecosystems, and how to …
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, dources and cycling
… weissflogii, Emiliania huxleyi and Phaeocystis, were cultured in seawater and their HMW DOM exudates examined by variety of analytical techniques. Both the T. weissflogii and E. huxleyi exudates contain compounds that resemble APS indicating that phytoplankton are indeed a source of …
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Structural characterization and bacterial degradation of marine carbohydrates
… Emiliania huxleyi, Stephanopixis palmeri, a Phaeocystis sp., and Synechococcus WH7335, were surveyed using one- and two-dimensional nuclear magnetic resonance spectroscopy (NMR). Two carbohydrates from Synechococcus WH7335 were characterized in detail. Synechococcus produced an α(1,4) glucose …
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Phytoplankton's role in the biological pump during the growth season across the Atlantic Southern Ocean
… Here, the phytoplankton community shifted from Phaeocystis Antarctica- to diatom-dominated as the growth season progressed, coincident with an increase in upper water-column stratification. This shift may have further decreased carbon export as P. Antarctica can fix up to 50% more carbon per …