Effects of different habitats versus agricultural practices on farmland birds in Ontario / Kathryn E. Freemark, Myriam Csizy.: CW69-5/280E-PDF

"The extent and intensity of modern agriculture have significant adverse implications for farmland wildlife and their habitats. A comparative field study was conducted on organic farms and conventional (chemical) farms in Ontario to identify important crop and non-crop habitats and agricultural practices for different groups of farmland birds, and to quantify their effects on bird species richness and abundance. Birds were surveyed using 180° point counts from field edges in May and June, 1990, on 20 organic and conventional farms paired geographically tor their similarity in crop and non-crop habitats. A total of 68 species were observed over ail sites, 59 on each farm type. Numbers of species and birds per site averaged 13.9 and 16.9, respectively, for unlimited distance (but still on farm) surveys. Abundance was significantly higher on organic than conventional farms. Data from limited distance surveys (100-m radius semicircle) showed similar patterns between farm types and among bird classes and species"--Abstract, p. i.

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