Demography of Dall's Sheep in the Mackenzie Mountains, Northwest Territories
Simmons NM, Bayer MB, Sinkey LO. 1984. Demography of Dall's Sheep in the Mackenzie Mountains, Northwest Territories. The Journal of Wildlife Management. 48(1):156-162
Population characteristics of immature and female Dall's sheep (Orvis dalli dalli) were studied during 1966-73 in the Mackenzie Mountains, Northwest Territories, Canada. The population was largely unaffected by human activities and was probably stationary. Population density on winter range was at least one/sq km, apparently lower than densities reported in Alaska and Yukon Territory. A time-specific life table was constructed for females based on 101 ewes collected in 1971-72. We estimated a 75.2% birth rate, an 80% early lamb survival, and a 49% first-year survival. Average annual mortality rate for ewes 1 year old and older was estimated at 14.8%. Longevity of both ewes and rams was at least 14 years. Average life expectancy for yearling ewes was 6+ years, similar to that in other mountain sheep (Ovis canadensis) populations.
- Type
- Journal Article
- Authors
- Simmons, N; Bayer, M; Sinkey, L
- Units
- DENA
- Keywords
- animal mortality, animal population, animal reproduction, ASTI277851, Bones, Mountain Sheep, Parasites