The impact that herbicides can have on aquatic environments is broadly recognized. Herbicides used in urban and rural areas for industrial and non-industrial purposes can cause fish and invertebrate mortality, avoidance response by fish and invertebrates and in the case of glyphosate increased algal productivity if spilled, leached, or directly applied to quatic systems. The biological response echibited is dependant upon several factors including the type of herbicide used, its applied concentration, the species and life stage of organisms exposed and the physical characteristics of the water body affected including pH, temperature and water hardness. Forest industry use of herbicides is primarily focussed on site preparation and stand management (Agriculture Canada 1991a & b). Prior to the field application of herbicides, licensees must apply for and obtain pesticide use permits. These permits, in combination with the Forest Practices Code help determine operational boundaries, buffer strips, mode of herbicide application and concentration of active ingredient, typically expressed as kg/ha. In addition to these permit requirements, all pesticide applicators are trained in the proper use of pesticides, which includes application techniques, handling, storage, and environmental effects. Although these steps satisfy our legislative requirements they may not address concerns about herbicide use and environmental expressed by some resource mangers, First Nations, the general public, and special interest groups.
Rex, John. 2000. Guidelines for Monitoring Glyphosate and Triclopyr Residues in Forest Streams
Topic: Water Quality
Keywords: aquatic environments, herbicides, fish mortality, invertebrate mortality, increased algal productivity, aquatic systems, biological response, pH, kg/ha, environmental effects, water quality data
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