Descriptive and experimental studies on the biotic and abiotic determinants of selected pesticide concentrations in prairie wetland water columns / Bruce Friesen-Pankratz.
Material type:
TextPublication details: 2004. Winnipeg, MB : University of Manitoba,Description: xiv, 327 leaves : ill., maps, plates. 29 cmSubject(s): Online resources: Dissertation note: Thesis (Ph.D.)--University of Manitoba, Fall 2004. Abstract: The determinants of high use agricultural pesticide concentrations in the water columns of Prairie Pothole Region (PPR) wetlands were examined to evaluate if these ecosystems had characteristics of pesticide sinks.For an ecosystem to function as a pesticide sink it needs to receive,retain, and reduce pesticides. A survey of sixty PPR wetlands (distance between two farthest sites 1,700 km) was conducted to determine the extent to which they received high use pesticides (atrazine and lindane). Sixty-two percent of the wetlands were contaminated with either atrazine or lindane. Pesticide presence was directly related to wetland proximity to pesticide use and precipitation prior to sampling. In June-July lindane presence was positively correlated with phytoplankton concentration; however, in August lindane presence was negatively correlated with phytoplankton concentration.
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Thesis (Ph.D.)--University of Manitoba, Fall 2004.
Includes bibliographical references (leaves 231-315).
The determinants of high use agricultural pesticide concentrations in the water columns of Prairie Pothole Region (PPR) wetlands were examined to evaluate if these ecosystems had characteristics of pesticide sinks.For an ecosystem to function as a pesticide sink it needs to receive,retain, and reduce pesticides. A survey of sixty PPR wetlands (distance between two farthest sites 1,700 km) was conducted to determine the extent to which they received high use pesticides (atrazine and lindane). Sixty-two percent of the wetlands were contaminated with either atrazine or lindane. Pesticide presence was directly related to wetland proximity to pesticide use and precipitation prior to sampling. In June-July lindane presence was positively correlated with phytoplankton concentration; however, in August lindane presence was negatively correlated with phytoplankton concentration.