An evaluation of Canada's permanent cover program: habitat for grassland birds?

摘要

In the early 1990s Agriculture Canada's Permanent Cover Program (PCP) con - verted over 445, 000 ha of cropland to perennial vegetative cover. The wildlife benefits of the PCP were not been the subject of previous research. We conducted grassland bird surveys On 629 PCP sites and 564 cropland sites across Alberta, Saskatchewan, and Manitoba between 25 May and 3 July 1998.