Present farming methods and the application of zero-tillage farming in Southwestern Manitoba, and the implications for waterfowl nesting success. W. Cowan
Material type:
TextPublication details: AB/SK/MB : 1976Online resources: Abstract: The prairies and parklands of southern Alberta, Saskatchewan and Manitoba comprise only 10% of the waterfowl breeding range, with an average duck density three times that of the remainder of the breeding range (Pospahala et al. 1974). Changes in production rates of ducks in the prairie-parklands thus effect major changes in the continental population. Recent declines in numbers of breeding ducks have been observed: about 50% in the continental population between 1955 and 1965.It has recovered by only 30% in 1976, even under a generally favourable water regime (Posphala et al. 1974; R.K. Brace, Canadian Wildlife Service, personal communication).
| Item type | Current library | Collection | Call number | Status | Date due | Barcode |
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Electronic Report
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Electronic Library | Non-fiction | COW (Browse shelf(Opens below)) | Available | 878 |
CD# 1 file COW010.PDF
The prairies and parklands of southern Alberta, Saskatchewan and Manitoba comprise only 10% of the waterfowl breeding range, with an average duck density three times that of the remainder of the breeding range (Pospahala et al. 1974). Changes in production rates of ducks in the prairie-parklands thus effect major changes in the continental population. Recent declines in numbers of breeding ducks have been observed: about 50% in the continental population between 1955 and 1965.It has recovered by only 30% in 1976, even under a generally favourable water regime (Posphala et al. 1974; R.K. Brace, Canadian Wildlife Service, personal communication).