00000nam 2200000za 4500 9.856997 CaOODSP 20241203113643 cr ||||||||||| 180528s1991 oncd o f00| 0 eng d CaOODSP eng eng fre n-cn--- CW69-5/137E-PDF Rogers, Catherine A. A feasibility study comparing birds from organic and conventional (chemical) farms in Canada [electronic resource] / Catherine A. Rogers, Kathryn E. Freemark. Ottawa : Canadian Wildlife Service, Headquarters, 1991. vii, 43 p. : charts. Technical report series ; no. 137 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (p. 16-17). "The study reported here was conducted in 1989 to investigate the feasibility of comparing birds between organic and conventional (chemical) farms in Canada, as a novel approach for assessing these effects. Since then, more extensive field studies have been conducted in Ontario, Saskatchewan and Quebec. The current report provides the background information used to justify the implementation of and specific design for those studies. The preliminary findings reported here, that the use of chemical pesticides and/or fertilizers contribute to a reduction in the number and variety of farmland birds, has been corroborated by analyses of the more extensive sample from Ontario"--Abstract. Includes summary in French. gccst Birds gccst Habitats Freemark, K. E. Canada. Environment Canada. Canadian Wildlife Service. Headquarters. Technical report series (Canadian Wildlife Service) no. 137. (CaOODSP)9.504438 PDF 1.87 MB https://publications.gc.ca/collections/collection_2018/eccc/cw69-5/CW69-5-137-eng.pdf