Global ETD Search

1	Primary Production and Nutrient Dynamics of Urban Ponds Rolon dos Santos Mérette, Muriel 01 February 2012 (has links) In urban areas, stormwater management ponds (SWPs) are built to mitigate polluted runoff. Although these ponds are increasing in numbers, their ecology is not well understood. Physical and chemical characteristics of 17 SWPs in the City of Ottawa were measured to determine the drivers of phytoplankton biomass (Chl. a) and primary production (PP). While total phosphorus was the best predictor of algal biomass in the ponds (as in lakes), the imperviousness of the catchment could also predict Chl. a. Planktonic PP in two ponds measured seasonally was more closely related to water residence time than to nutrient concentrations with rates approaching at times the theoretical maximum for aquatic systems. In one pond, whole ecosystem metabolism, estimated using diel changes in dissolved oxygen and δ18O-O2, suggested that these hypereutrophic systems were net sinks for carbon in the summer but likely sources to the atmosphere at other times of the year. Urban pond Phytoplankton primary production Whole ecosystem metabolism Chlorophyll a Nutrients Water residence time Trophic state Urban limnology PoRGy δ18O Oxygen isotope Phytoplankton Stormwater management ponds
2	Primary Production and Nutrient Dynamics of Urban Ponds Rolon dos Santos Mérette, Muriel 01 February 2012 (has links) In urban areas, stormwater management ponds (SWPs) are built to mitigate polluted runoff. Although these ponds are increasing in numbers, their ecology is not well understood. Physical and chemical characteristics of 17 SWPs in the City of Ottawa were measured to determine the drivers of phytoplankton biomass (Chl. a) and primary production (PP). While total phosphorus was the best predictor of algal biomass in the ponds (as in lakes), the imperviousness of the catchment could also predict Chl. a. Planktonic PP in two ponds measured seasonally was more closely related to water residence time than to nutrient concentrations with rates approaching at times the theoretical maximum for aquatic systems. In one pond, whole ecosystem metabolism, estimated using diel changes in dissolved oxygen and δ18O-O2, suggested that these hypereutrophic systems were net sinks for carbon in the summer but likely sources to the atmosphere at other times of the year. Urban pond Phytoplankton primary production Whole ecosystem metabolism Chlorophyll a Nutrients Water residence time Trophic state Urban limnology PoRGy δ18O Oxygen isotope Phytoplankton Stormwater management ponds
3	Primary Production and Nutrient Dynamics of Urban Ponds Rolon dos Santos Mérette, Muriel January 2012 (has links) In urban areas, stormwater management ponds (SWPs) are built to mitigate polluted runoff. Although these ponds are increasing in numbers, their ecology is not well understood. Physical and chemical characteristics of 17 SWPs in the City of Ottawa were measured to determine the drivers of phytoplankton biomass (Chl. a) and primary production (PP). While total phosphorus was the best predictor of algal biomass in the ponds (as in lakes), the imperviousness of the catchment could also predict Chl. a. Planktonic PP in two ponds measured seasonally was more closely related to water residence time than to nutrient concentrations with rates approaching at times the theoretical maximum for aquatic systems. In one pond, whole ecosystem metabolism, estimated using diel changes in dissolved oxygen and δ18O-O2, suggested that these hypereutrophic systems were net sinks for carbon in the summer but likely sources to the atmosphere at other times of the year. Urban pond Phytoplankton primary production Whole ecosystem metabolism Chlorophyll a Nutrients Water residence time Trophic state Urban limnology PoRGy δ18O Oxygen isotope Phytoplankton Stormwater management ponds

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