||Modification of Point Counts for Surveying Cropland Birds.
Freemark, K. ;
Rogers, C. ;
||Corvallis Environmental Research Lab., OR. ;National Wildlife Research Centre, Ottawa (Ontario).
Farm crops ;
Environmental impacts ;
Seasonal variations ;
Foreign technology ;
Point count method
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The extensive use of commercially-synthesized pesticides and fertilizers in modern agriculture has significant implications for farmland wildlife. The Canadian Wildlife Service has used the recent trend toward alternative agriculture to develop a comparative field study for evaluating the ecotoxicological impact of agrichemical used. A point-count based study by Brae et al. in Denmark indicated the potential utility of comparing avifauna on organic and chemical farms. In adapting the Danish approach for Canada, the authors evaluated point counts as a method for surveying birds in and adjacent to cropland and thereby potentially exposed to agrichemicals. As part of a comparative study of agricultural impacts on wildlife, modifications to the point count method were evaluated for surveying birds in and adjacent to cropland during the breeding season (May-early July) in Ontario.