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Glyphosate herbicides are the most widely used non-selective broad-spectrum herbicides in the world. In Canada they are extensively used in forestry for site preparation and for conifer release. This report summarizes current literature on the non-target impacts of glyphosate herbicides on amphibians and combines reviews of published studies with a review of the application guidelines and the use patterns of this herbicide in silviculture in BC, identifies knowledge gaps in the assessment of herbicide impacts on native amphibians in this province. Recent studies have shown that amphibians are one of the most sensitive vertebrate groups to the toxicological effects of this herbicide. British Columbia ranks second in Canada in the use of glyphosate in forestry, with glyphosate herbicides used over appr. 20,000 ha of forested land, primarily for conifer release. This review suggests that the silvicultural use of glyphosate needs to be re-evaluated with respect to non-target impacts on amphibians in BC. The impact of glyphosate herbicides on salamander species and on terrestrial stages of amphibians is not well understood. These knowledge gaps need to be addressed so that best management practices can be developed to minimize non-target impacts on amphibians from the use of glyphosate herbicides in forestry.
Govindarajulu, P. P.. 2008. Literature review of impacts of glyphosate herbicide on amphibians: What risks can the silvicultural use of this herbicide pose for amphibians in BC?. B.C. Ministry of Environment. Wildlife Report. R28
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Keywords: amphibian, salamander, frog, herbicide, british columbia, silviculture, forestry, best management practices
English Name: Boreal Chorus Frog, Tiger Salamander, Columbia Spotted Frog, Coastal Giant Salamander, Long-toed Salamander, Great Basin Spadefoot, Red-legged Frog, Oregon Spotted Frog, Wood Frog, Western Toad, Northern Leopard Frog, Rough-skinned Newt, Pacific Treefrog, Rocky Mountain Tailed Frog, Northwestern Salamander
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