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Effects of the Herbicide Glyphosate on Bird Community Structure, Western Oregon

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Abstract:

A study was conducted on vegetative changes induced by the herbicide glyphosate, and the resultant habitat use of birds nesting on two clearcuts in western Oregon. About 23 percent of total plant cover was initially damaged by aerial application of glyphosate. Most measures of vegetation on the treated site decreased relative to the untreated site 1 year after glyphosate application. By 2 years post-spray, vegetation on the treated site had recovered to near pre-spray status. No difference in density of the bird community was evident between treated and untreated sites during all years of study although individual species densities were modified. Several bird species decreased their use of shrub cover, and increased their use of deciduous trees 1 year after treatment. By 2 years post-spray, many species had returned to pre-spray use of most measured habitat components. Results indicated that application of glyphosate can modify the density and habitat use of birds. Forest Sci. 30:95-106.

Keywords: Avifauna; bird density; bird diversity; bird habitat use; clearcuts; habitat modification

Document Type: Journal Article

Affiliations: Leader, Cooperative Wildlife Research Unit, Oregon State University, Corvallis, Oregon 97331

Publication date: March 1, 1984

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