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 22 for “"phytoplankton populations"”.
-
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.
-
Responses of Boom-Forming Phytoplankton Populations to Changes in Reservoir Chemistry and Physics
Phytoplankton populations are integral to the structure and function of aquatic ecosystems, and phytoplankton are an excellent study system for exploring ecological questions. Reservoirs often exhibit high horizontal (inflow to dam) and vertical (surface to sediments) environmental heterogeneity, …
-
Dynamic behavior of phytoplankton populations far from steady state : chemostat experiments and mathematical modeling
… does the environment influence the behavior of populations? And what does the transient behavior look like? As a result from environmental influences on demography, so called cohorts form. They are age or size classes that are disproportionally represented in the demographic distribution of a …
-
Characteristics of Nitrogen- and Iron-Limited Growth in the Diatom Phaeodactylum tricornutum, and in Natural Phytoplankton Populations.
… involved in nitrogen (N) utilisation by marine phytoplankton have received considerable attention over the last forty years, but our understanding of these processes, and how they are affected by environmental change is still far from complete. This study investigates N metabolism in marine …
-
Effect of rate of water discharge on phytoplankton in Claytor Lake, Virginia
… the effect of water discharge on reservoir phytoplankton. Number/liter, areal units/liter, average cell size, and chlorophyll a content were used as measures of phytoplankton abundance. Rate of water discharge had an adverse effect on reservoir phytoplankton populations during spring and …
-
Phytoplankton Dynamics of Two Northern Prairie Lakes and Possible Relations to Dissolved Nutrients
Phytoplankton populations in Enemy Swim Lake were observed to be quite different. Although these lakes lie within the same geographic area (Coteau des Prairies), major differences in water quality were recorded. The differences in water quality were reflected in the phytoplankton populations and …
-
Investigating exudate- and habitat-mediated effects of phytoplankton on lake bacterial community dynamics
… and composition are commonly observed between phytoplankton and bacterial communities. There are a number of potential explanations for correlated dynamics. Recent observations of temporal succession in lake microbial communities provide evidence for phytoplankton populations acting as …
-
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: …
-
Toward an improved understanding of the Southern Ocean's biological pump: phytoplankton group-specific contributions to nitrogen and carbon cycling across the Subantarctic Indian Ocean
Iron (and silicate) (co-)limitation of phytoplankton is considered a primary cause of the Southern Ocean's inefficient biological pump. However, the role of phytoplankton community structure and response to nutrient cycling remains poorly understood. In a mass balance sense, phytoplankton …
-
Identification and Characterization of Phytoplankton in Barnegat Bay, New Jersey
… have led to eutrophication and proliferation of phytoplankton algal blooms. Harmful algal blooms (HABs) cause a decrease in dissolved oxygen levels in the water as well as the release of harmful toxins that affect organisms inhabiting the bay, including humans.</p> <p>To research and develop …
-
Genetic variability and differentiation in niche components of marine phytoplankton species
… in asexual reproduction rates in individual phytoplankton populations ranged from 3 t o 13% (coefficients of variation). There is no obvious relationship between the amounts of genetic variability in the populations and the variability or predictability of the environments from which they …
-
The ecology of the Chironomidae (Diptera) in a new eutrophic reservoir
… from the inundated terrestrial vegetation. Phytoplankton populations showed erratic changes in species composition and standing crop during the first year of filling. Seasonal fluctuations, similar to those observed at other eutrophic reservoirs, occurred in subsequent years. Chironomid …
-
The combined effect of daylength and CO2 on coccolithophore physiology
… photosynthesis and calcification, and as such phytoplankton have been a main topic of OA studies. While research has accelerated over the last decade, establishing general trends still remains confounded by methodological inconsistencies. Coccolithophores, particularly the species Emiliania …
-
Phytoplankton induced changes of air bubble residence time in seawater
… been investigated. It is hypothesised that phytoplankton influence BRT through the production of dissolved organic material (DOM) and oxygen.<br/>Laboratory experiments were carried out in a seawater mesocosm tank system to investigate the influence of phytoplankton growth on the BRT of …
-
Ecological forces affecting microbial eukaryotes in the coastal ocean
… communities comprise carbon-fixing eukaryotic phytoplankton, which comprise the base of the marine food web, heterotrophic protists, which are predators of other microbes, and mixotrophs, which engage in a combination of these nutritional modes. The total abundance of a protistan population at …
-
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 …
-
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 …
-
Investigating the effect of phytoplankton on bacterial community composition across different environmental contexts
… aimed at testing the hypothesis that phytoplankton seasonal succession effects changes in bacterial community composition and characterizing interactions between phytoplankton and bacteria across different environmental contexts. Observational and experimental approaches were combined …
-
An investigation of factors influencing the spatial and temporal distribution of surface phytoplankton in the English Channel and Bay of Biscay in 2003 and 2004
… the ferry provided information<br/>on nutrients, phytoplankton biomass and speciation. Measurements include chlorophyll<br/>a concentrations (calibration of the fluorimeter is discussed), High Performance Liquid<br/>Chromatography (HPLC) determined pigments concentrations, phytoplankton …
Page 1 of 2