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Communication at the NABS Annual meeting, Keystone, 2000
(265) DETERMINANTS OF HERBICIDE DISSIPATION IN GREAT PLAINS WETLANDS.
B. Friesen-Pankratz and L.G. Goldsborough. Department of Botany, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
Natural wetlands on the North American Great Plains are closely situated to agricultural land and thus can receive herbicide inputs via surface water runoff, groundwater discharge, and atmospheric deposition. Possible toxic effects on primary producers (algae and macrophytes) may have fundamental consequences for wetland fauna. The environmental fate of a herbicide in the wetland is determined by its chemical properties, such as susceptibility to photolysis by ultraviolet radiation and sorption to organic matter, and the biotic and abiotic conditions of the wetland. To investigate factors affecting the fate of herbicides in Great Plains wetlands, we collected samples of water, sediment, algae, and macrophytes from 60 wetlands distributed throughout the “prairie pothole” region (43–53°N, 94–108°W). In addition to a wide suite of chemical analyses, we measured the concentrations of two major agricultural herbicides, atrazine and 2,4-D, in the sampled wetlands and the vertical extinction of visible and ultraviolet light. Multivariate statistical analyses will be used to elucidate relationships between the measured variables.
Presented at 11:30 AM on Thursday, June 1, 2000 in Ecotoxicology
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