Browsing Theses by Supervisor "Hall, Roland"
Now showing items 1-13 of 13
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Application of artificial substrate samplers to assess enrichment of metals of concern by river floodwaters to lakes across the Peace-Athabasca Delta
(University of Waterloo, 2021-05-19)Potential for downstream delivery of contaminants via Athabasca River floodwaters to lakes of the Peace-Athabasca Delta (PAD), northeastern Alberta (58.6°N, 111.8°W), has raised local to international concern. Prior ... -
Assessing relations among multiple environmental gradients for shallow lakes in Old Crow Flats, Yukon, using hydrological, limnological and community-collaborative research approaches
(University of Waterloo, 2018-01-09)Shallow freshwater ecosystems are undergoing marked hydrological changes associated with a warming Arctic, which causes concern for remote northern communities that access these regions to maintain their traditional ... -
Developing pre-industrial baselines from floodplain lake sediment cores to quantify the extent of metals pollution within the Alberta Oil Sands Region
(University of Waterloo, 2018-11-28)Oil sands mining operations began in 1967, but the onset of a monitoring program to assess water and sediment quality in the Athabasca River watershed began 30 years later. Consequently, no knowledge of pre-industrial, ... -
Development and application of paleolimnological analyses to disentangle the roles of natural processes and anthropogenic activities on contaminant deposition and hydrological conditions across a northern delta
(University of Waterloo, 2022-08-29)Freshwater ecosystems across northern Canada provide important habitat for wildlife and have long supported the traditional lifestyles of Indigenous communities. Multiple potential stressors threaten the security of water ... -
Development and Application of Periphyton-Based Biomonitoring Methods to Elucidate Aquatic Ecosystem Responses of Lakes in a Water-Rich Northern Landscape (Old Crow Flats, Yukon, Canada) to Climate Change
(University of Waterloo, 2022-12-13)Shallow freshwater lakes are abundant in Arctic and subarctic regions, where they provide important wildlife habitat and sustain the cultural heritage and traditional land use of Indigenous communities. Concern over effects ... -
Environmental controls of sediment mercury accumulation in a large, glacially-fed lake
(University of Waterloo, 2017-07-19)Mercury is an environmental contaminant of concern, especially in northern regions where human exposure to mercury through fish consumption can be high. Mercury accumulation in northern lakes has increased over the past ... -
Evaluating the role of local climate change on reduced freshwater availability at the Peace-Athabasca Delta using paleolimnology
(University of Waterloo, 2022-06-02)Abundant small, shallow lakes across northern freshwater landscapes are particularly sensitive to alteration of hydrological processes, which makes them vulnerable to multiple potential stressors. At the Peace-Athabasca ... -
Investigating the role of the Smoky River watershed on past ice-jam flood regimes at the Peace-Athabasca Delta via analysis of oxbow lake sediment cores
(University of Waterloo, 2022-06-06)The Peace-Athabasca Delta (PAD) in northern Alberta has been a focus of concern for decades due to decline in frequency and magnitude of ice-jam floods that sustain ecologically and culturally significant shallow perched ... -
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 ... -
Paleohydrology of the Wabasca River and relations with past flood regimes at the downstream Peace-Athabasca Delta
(University of Waterloo, 2022-08-22)The Peace-Athabasca Delta (PAD; northern Alberta) is internationally recognized for its ecological, historical, and cultural significance, yet controversy persists over the roles of hydroelectric regulation of Peace River ... -
Reconstruction of past variation in lake water balance at upstream Smoky and Wabasca watersheds to improve understanding of causes of lake drying in the Peace-Athabasca Delta
(University of Waterloo, 2023-01-23)Controversy persists regarding causes of recent lake-level drawdown within the internationally recognized Peace-Athabasca Delta (PAD), northern Alberta. Central to this debate are conflicting interpretations of causes of ... -
Spatiotemporal patterns of arsenic, antimony, and lead deposition in a sub-arctic gold mining region of Canada
(University of Waterloo, 2021-01-25)Mining operations at Giant and Con mines (Northwest Territories, Canada) resulted in the release of >20,000 tonnes of arsenic trioxide (As2O3) into the atmosphere, mainly during the 1950s, which were deposited on the ... -
Using paleolimnology to assess influence of Peace River regulation on lakes along two transects in the northern portion of the Peace-Athabasca Delta
(University of Waterloo, 2022-08-18)The Peace-Athabasca Delta (PAD), northern Alberta, Canada, is an ecologically and culturally important floodplain where debate has persisted for more than 60 years about causes of water-level drawdown of its abundant, ...