Browsing University of Waterloo by Subject "phytoplankton"
Now showing items 1-12 of 12
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Application and assessment of multi-wavelength measurements of variable chlorophyll a fluorescence for analysis of irradiance stress, physiological state and community composition in freshwater phytoplankton
(University of Waterloo, 2018-04-24)Phytoplankton are a diverse group of organisms of fundamental importance in aquatic ecosystems. Exposure to high levels of photosynthetically active and ultraviolet radiation (PAR and UVR) is unavoidable for most phytoplankton ... -
Assessment of Drivers of Algal Biomass in North American Great Lakes via Satellite Remote Sensing
(University of Waterloo, 2024-04-02)Lakes are regarded as sentinels of change, where shifts in environmental conditions significantly affect lake phenology. A significant consequence of the change is the perceived increase in the frequency, magnitude, and ... -
Automatic Identification of Algae using Low-cost Multispectral Fluorescence Digital Microscopy, Hierarchical Classification & Deep Learning
(University of Waterloo, 2019-12-05)Harmful algae blooms (HABs) can produce lethal toxins and are a rising global concern. In response to this threat, many organizations are monitoring algae populations to determine if a water body might be contaminated. ... -
Bio-optical Modeling of Aquatic Photosynthesis in the Laurentian Great Lakes
(University of Waterloo, 2010-05-19)The methodology of phytoplankton production measurements in the Laurentian Great Lakes and other freshwater lakes has remained largely unchanged in the past 40 years. In most studies photosynthesis from a single water ... -
Effects of Nutrients, Photoinhibition & Photoacclimation on Photosystem II Function of Freshwater Phytoplankton Communities
(University of Waterloo, 2011-12-21)Electron flow through Photosystem II (PSII) is essential to all life on Earth. The efficiency of this process in freshwater phytoplankton can be depressed by nutrient limitation, ultraviolet radiation (UVR), and excessive ... -
Examining the growth and stable isotopes of phytoplankton and periphyton communities exposed to oil sands reclamation strategies
(University of Waterloo, 2013-01-28)The impacts of oil sands processed materials (OSPM) on phytoplankton and periphyton community growth and stable carbon and nitrogen isotopes were examined. Estimates of plankton and periphyton community growth, measured ... -
Investigating the use of variable fluorescence methods to detect phytoplankton nutrient deficiency
(University of Waterloo, 2013-04-29)Variable fluorescence of chlorophyll a (Fv/Fm), measured by pulse amplitude modulated (PAM) fluorometers, is an attractive target for phytoplankton-related water quality management. Lowered Fv/Fm is believed to reflect ... -
Long-term changes in spring phytoplankton community composition in five south-central Ontario lakes and their relations with spring water chemistry and climate
(University of Waterloo, 2019-05-23)Spring is an ecologically important period for phytoplankton communities, as environmental stressors such as acid deposition and recovery, climate warming, and shoreline development may exert strong influence at this time ... -
Phytoplankton dynamics in nearshore and offshore regions of the Great Lakes Erie, Malawi, Tanganyika, and Victoria
(University of Waterloo, 2008-02-22)My doctoral thesis challenges the traditional paradigm of phosphorus (P) limitation of phytoplankton communities in freshwaters by suggesting colimitation of P, nitrogen (N), and iron (Fe) in Great Lakes. Oceanographers ... -
Plankton Metabolic Balance and its Controlling Factors in the Coastal Zone of the Laurentian Great Lakes
(University of Waterloo, 2007-10-01)Plankton metabolic balance (PMBm) of the surface mixed layer was calculated as the ratio of areal rates of gross photosynthesis (AGP) to community respiration (AR), and estimated for four Laurentian Great Lakes coastal ... -
Primary Production by Phytoplankton in Lake Simcoe 2010-2011
(University of Waterloo, 2013-05-07)Degradation of water quality, introduction of dreissenid mussels (notably <i>Dreissena polymorpha</i>) and depletion of oxygen concentrations in the hypolimnion in Lake Simcoe, Ontario prompted a study of phytoplankton ... -
System and plankton metabolism in the lower Grand River, Ontario
(University of Waterloo, 2008-12-23)Currently our understanding of both system and phytoplankton metabolism in large rivers is somewhat limited. Knowledge of the metabolic balance in such systems is necessary not only for proper management of the river itself, ...