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 20 of 679 for “"Phytoplankton"”.
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Phytoplankton in flow
Phytoplankton are small, unicellular organisms, which form the base of the marine food web and are cumulatively responsible for almost half the global production of oxygen. While phytoplankton live in an environment characterized by ubiquitous fluid motion, the impacts of hydrodynamic conditions on …
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Iodate Transformation By Marine Phytoplankton
… the oceans are partly under biological control. Phytoplankton are suspected to mediate the transformation of iodate to iodide via reduction by the enzyme nitrate reductase. However, there has been no direct evidence to support this hypothesis.</p> <p>The influence of phytoplankton on the …
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A metabolic lens on phytoplankton physiology
Phytoplankton are communities of diverse groups of prokaryotic and eukaryotic single-celled organisms responsible for nearly 50% of global primary production. The relative abundance of individual groups changes dynamically in response to environmental perturbations. Recent studies suggest that such …
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Optical characterisation of Southern Ocean phytoplankton
… the optical properties of Southern Ocean (SO) phytoplankton with high confidence is critical to understanding the role of the Biological Carbon Pump (BCP). Satellite-based ocean colour remote sensing radiometry is the only observational capability that can provide synoptic views of upper ocean …
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A Metabolic Lens on Phytoplankton Physiology
Phytoplankton are communities of diverse groups of prokaryotic and eukaryotic single-celled organisms responsible for nearly 50% of global primary production. The relative abundance of individual groups changes dynamically in response to environmental perturbations. Recent studies suggest that such …
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Estimating phytoplankton growth rates from compositional data
I build on the deterministic phytoplankton growth model of Sosik et al. by introducing process error, which simulates real variation in population growth and inaccuracies in the structure of the matrix model. Adding a stochastic component allows me to use maximum likelihood methods of parameter …
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Factors regulating phytoplankton populations at Churchill, Manitoba.
Dept. of Biological Sciences. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1987 .G739. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.Sc.)--University of Windsor (Canada), 1987.
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Investigations of Phytoplankton Diversity in Chesapeake Bay
… microbial organisms remains relatively limited. Phytoplankton represent a diverse and important group that contribute approximately half of global primary productivity and are intrinsically connected to changing environmental conditions, especially in systems as dynamic as estuaries. To better …
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Factors Affecting Phytoplankton Biodiversity and Toxin Production
… and ammonium. Algal assays were conducted for phytoplankton identification and numbers, and indices of biodiversity (richness and evenness) were calculated to ascertain relationships between nutrients and algal growth, especially beneficial Chlorophyta and toxic Cyanophyta. After identifying …
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Phytoplankton Ecology in the Skidaway River Estuary
… and light availability strongly influence total phytoplankton biomass but less is known about their effects on species-level changes due to difficulties associated with identifying and enumerating individual taxa. Understanding taxon-specific shifts is important as species often contribute …
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Marine phytoplankton in a high CO2 world
Marine phytoplankton is responsible for ~50% of global primary productivity, it supports the oceanic food web and affects biogeochemical cycles. I participated in a large mesocosm experiment that observed altered community structure and carbon drawdown in response to increased CO2. There was a 27% …
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Phytoplankton productivity of tropical Lake Chapala, Mexico.
Phytoplankton productivity and other environmental variables were measured for one year (June 1983 - June 1984) at five stations on Lake Chapala, Mexico. Contrary to expectations, productivity in this shallow, tropical lake 14 was low. Phytoplankton productivity, estimated from C data, was 76.4 g C …
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Cobalt substitution for zinc in marine phytoplankton
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Estimating phytoplankton growth rates from compositional data
I build on the deterministic phytoplankton growth model of Sosik et al. by introducing process error, which simulates real variation in population growth and inaccuracies in the structure of the matrix model. Adding a stochastic component allows me to use maximum likelihood methods of parameter …
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Physical influences on phytoplankton ecology : models and observations
… environment in the oceans dictates not only how phytoplankton cells are dispersed and their populations intermingled, but also mediates the supply of nutrients to the surface mixed layer. In this thesis I explore both of these aspects of the interaction between phytoplankton ecology and ocean …
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Uncovering Mechanisms of Phytoplankton Response to Climate Change
Phytoplankton are responsible for approximately half the primary production on earth, fueling marine food webs and driving the cycling of carbon and inorganic nutrients in the oceans. Climate change is predicted to alter the marine environment by elevating carbon dioxide, increasing temperature, …
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Environmental Causes of Pigment Heterogeneity In Phytoplankton Species
… with the ability to identify single-cells of phytoplankton species based on the presence of different types of pigments within each cell. Classifying phytoplankton species is important to understand biogeochemical cycles and the pelagic food chain system in the ocean, which could be …
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Climate impact on phytoplankton blooms in shallow lakes
… understanding of climate impacts on freshwater phytoplankton, which forms the basis of the food chain and decisively influences water quality. The analyses were, for the most part, based on a long-term data set of physical, chemical and biological variables of a shallow, polymictic lake in …
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