Summer and winter bird populations associated with five age-classes of aspen forest in Alberta

摘要: Summer and winter bird use of aspen forests was studied in west central Alberta. Forest age-classes the study included 1- 2-year-old clear-cut areas and.14-, 30-, 60-, 80-year-old stands. Habitat structure composition were quantified by a combination measurement estimation variables. Density breeding population estimated territorial mapping. Changes habitat between different resulted successional replacement species. Number individuals greatest 14-year-old stands at 656 territories per 100 ha, probably owing to presence remnant snags large trees that had survived past fires. The 30-year-old supported 312 60-year-old 380 territories, 231 respectively. Recently only 110 territories. species followed same pattern with 25 stands, 22 21 60-year-o...