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.
Results
Showing 1 to 20 of 92 for “"phytoplankton community"”.
-
Spectral Irradiance and Phytoplankton Community Composition In Blackwater Estuaries
… between spectral irradiance (water color) and phytoplankton community composition in blackwater habitats. Spatial and temporal variability in water color and phytoplankton community composition were examined in two South Carolina estuaries: Winyah Bay and North Inlet. In Winyah Bay, the …
-
Dynamics of phytoplankton community composition in the western Gulf of Maine
… dissertation is founded on the importance of phytoplankton community composition to marine biogeochemistry and ecosystem processes and motivated by the need to understand their distributions on regional to global scales. The ultimate goal was to predict surface phytoplankton communities using …
-
Predicting phytoplankton community dynamics: understanding water quality responses to global change
… environmental heterogeneity and ecological community structure, both of which are currently undergoing unprecedented alterations due to global change. In particular, many freshwater phytoplankton communities are experiencing multiple global change stressors, altering phytoplankton community …
-
Phytoplankton community structure determined through remote sensing and in situ optical measurements
Linking variability in optical signals with phytoplankton community characteristics is important to extend the use of the vast resource that is the satellite ocean colour archive. Detection of species, functional types or size classes has been addressed through a spectrum of empirical to analytical …
-
Phytoplankton community structure response to groundwater-borne nutrients in the Inland Bays, DE
… experiments, coupling seepage meters directly to phytoplankton enclosure experiments to determine the impacts of groundwater-borne nutrients on biomass and response in community structure of phytoplankton. To assess the impacts of groundwater-borne nutrients, we measured chlorophyll a …
-
The role of zooplankton - phytoplankton community interactions in the nutrient dynamics of Lake Chapala, Mexico.
… and grazing by zooplankton and their effects on phytoplankton production and biomass. Two sets of experiments were conducted on samples from Lake Chapala, Mexico from September through December, 1983. One set of experiments was designed to measure zooplankton NH^-N regeneration, and the other set …
-
The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… role of nutrient supply and grazing in promoting phytoplankton diversity. Zooplankton switching plays a significant role in promoting diversity because it allows competing phytoplankton types to coexist in situations that would otherwise lead to competitive exclusion. When implemented in a …
-
Phytoplankton community structure and cyanobacterial blooms in reservoirs in the semi-arid highlands of Tigray, Ethiopia
… to be characterized by high nutrient loads and phytoplankton blooms, including cyanobacteria blooms. This has indeed observed in a field survey of reservoirs, most of them suffer from heavy blooms of cyanobacteria. In this study we started with a field survey of a set of 32 shallow semi-arid …
-
A bio-optical approach to phytoplankton community sturcture, physiology and primary production on the Weddell Gyre
… nature of this region, in situ measurements of phytoplankton variability are scarce. Consequently, satellites, autonomous floats and gliders are increasingly being utilized as platforms for observing biogeochemical variability over broad spatial and temporal scales, through satellite ocean …
-
Are distinct particle spectra an indication of the state of the phytoplankton community in St Helena Bay?
The potential of phytoplankton particle spectra to be used as the basis for an indicator of the suitability of feeding habitat for fish recruits in the Southern Benguela was investigated. Phytoplankton samples collected on regular cruises on the St Helena Bay Monitoring Line (SHBML) off Elands Bay …
-
Seasonal and Spatial Distribution of the Plankton of Barren Lake, Kentucky, with Special Reference to the Phytoplankton Community
… and pH was consistently slightly alkaline. The phytoplankton community was dominated by taxa considered to be characteristic of both eutrophic and oligotrophic waters, but maxima were relatively low (77000 - 155000 cells/1). During the study, five major phytoplankton populations were present: …
-
Effect of future CO2 and temperature regimes on phytoplankton community composition, biomass and photosynthetic rates in the western English Channel
… processes. Production of organic matter through phytoplankton photosynthesis drives CO2 sequestration, which feeds back to atmospheric CO2 and global climate. The ongoing increase in atmospheric CO2 and temperature is strongly associated with changes in ocean chemistry and increasing seawater …
-
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 …
-
Spectral Fluorometric Characterization of Phytoplankton Community Composition and Biomass, Chromophoric Dissolved Organic Matter, and Photosynthetic Capacity Using the Algae Online Analyzer
<p>The composition of phytoplankton communities in estuaries can be highly variable in space and time. There is a general lack of information on how community composition varies on short time scales (hours to days). This stems, in part, from the fact that continuous monitoring of phytoplankton is …
-
Effects of light and nutrient gradients on the taxonomic composition, size structure and physiological status of the phytoplankton community within a temperate eutrophic estuary
… and this is the contribution of this thesis for phytoplankton communities in Southampton Water. The size structure and species composition were investigated during 2002 and 2003, with special attention to nanophytoplankton (cells < 5µm in diameter). The main sampling stations were Empress Dock …
-
Phytoplankton community structure, productivity and nitrogen metabolism as a function of light availability in the Atlantic sector of the southern Ocean by Erika Anne Kean.
This study covered six oceanic regions within the south Atlantic sector of the Southern Ocean during austral summer 2008/2009. Four transects from Cape Town to Antarctica, Antarctica to South Georgia Island and the return reciprocal legs surveyed the following regions, the Subtropical zone (STZ) …
-
Colonization and succession of phytoplankton species in upwelling plumes off the Cape Peninsula
Colonization and temporal changes in phytoplankton diversity and biomass in the upwelling plumes off the Cape Peninsula are described for two different communities. A drogue study showed the presence of a fast-developing mixed phytoplankton community with Chaetoceros compressus Laud. and …
-
FLOW CYTOMETRIC INVESTIGATION OF THE SIZE SPECTRUM OF NORTH SEA PHYTOPLANKTON COMMUNITIES
… biogeochemical processes are closely linked to phytoplankton community assemblages. Cell abundance and biomass are a measure of the successful conversion of inorganic to organic carbon. Carbon estimates are therefore often used to analyse metabolism and energy transfers within marine …
-
Lake remediation by top-down and bottom-up management : an ecosystem-scale experiment in the English Lake District
… sediments and the effects of climate change on phytoplankton community structure appear to have buffered against the desired impact of reduced external nutrient loads. Analysis of contemporary surface sediments revealed a legacy of phosphorus enrichment from years of high external loading, …
Page 1 of 5