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February 5-18, 2001 |
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If you choose to follow any links to the abstracts and/or complete text of articles, books, and documents listed below, you will be leaving the Strategian Web site. If you wish to return to this page from the Web page you are sent to, please use the Back option of your browser. Feature Items: David B. Donald, Narine P. Gurprasad, Lynne Quinnett-Abbott, and Kevin Cash Diffuse Geographic Distribution of Herbicides in Northern Prairie Wetlands. (... hypothetically, the concentrations of herbicides in water from wetlands that are located on land where herbicides are not used should be less than from wetlands on conventional farms where herbicides are used in a moderate fashion and from wetlands on minimum-till farms where herbicides are used more intensely. Testing wetlands situated in the Boreal Plains Ecozone of central Saskatchewan, Canada, however, these researchers found that this hypothesis was not supported. The data showed that the overall detection frequency of 10 commonly used herbicides was not significantly different among wildlife habitat with no pesticide use [44.4%], farms with no pesticide use [51.6%], conventional farms [54.9%], and minimum-till farms [56.5%]. And, generally, the frequency of detection and the concentrations of the herbicides were similar on all land-use types. The authors explain their findings by suggesting that many agricultural pesticides are rapidly lost to the atmosphere at the time of application by processes such as volatilization [or vaporization] from soil and plant evapotranspiration [evaporation]. Then, the herbicides used throughout the region may be directly absorbed to the surface of wetlands from the atmosphere, or they become entrained in local convective clouds, and are redistributed by rainfall in a relatively homogenous mixture over the agricultural landscape. The authors also reported that the low levels of individual herbicides we found in most of the wetland waters would not cause chronic effects to aquatic animals and plants. Other keywords and phrases -- agricultural, agriculture, bromoxynil, dicamba, diclorprop, (4-chloro-2-methylphenoxy) acetic acid (MCPA), mecoprop, 2,4-dichlorophenoxyacetic acid (2,4-D) -- from the text of the abstract) Environmental Toxicology and Chemistry Volume 20, Number 2 (2001): 273-279. **An abstract of the article is currently available through the Web site of Environmental Toxicology and Chemistry** How to find the above journals, magazines, and other publications? See Step 3: Locate of the Information Strategy for details. Questions about any or all of the above? Please let me know. |
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