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Aerial block surveys were conducted during 20 to 25 June 2001 to document the number and distribution of Dall’s sheep (Ovis dalli) in the Richardson Mountains, Northwest Territories (NWT) and Yukon Territory (YT). We counted and classified 1,057 sheep including 734 nursery sheep, 92 lambs, 231 rams (43 half curl, 55 three-quarter curl and 133 full curl). The annual rate for the non-lamb portion of the population was 8% during 1997 to 2001; this was the first decline documented for this sheep population since surveys began in 1984. The number of full curl rams decreased by 38% (from 373 in 1991 to 231 in 2001). There were 12.5 lambs per 100 nursery sheep; this ratio was significantly lower than those observed...
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Aerial block surveys (blocks established in 1984) were conducted during 16 to 31 August 2003 to document the number and distribution of Dall’s sheep (Ovis dalli) in the Richardson Mountains, Northwest Territories (NWT) and Yukon Territory (YT), Canada. We counted and classified 757 sheep including 429 nursery sheep, 121 lambs, 177 rams (35 half curl, 41 three-quarter curl and 109 full curl) and 29 unclassified sheep. The annual rate of decline for the non-lamb portion of the population was 14% during 2001 to 2003; this population decline began during 1997 to 2001. There were 28.2 lambs per 100 nursery sheep indicating that productivity or lamb survival increased between 2001 and 2003. The numbers of rams...
    map background search result map search result map Environmental change and traditional use of the Old Crow Flats in northern Canada: an IPY opportunity to meet the challenges of the new northern research paradigm Distribution and abundance of Dall's sheep in the Richardson Mountains, August 2003 Distribution and abundance of Dall's sheep in the Richardson Mountains, June 2001 Moose survey: Dawson early-winter 2008 Mapping invasive plants in Downtown Dawson City 2008 Synthesis of Survival Rates and Causes of Mortality in North American Wolverines Mapping invasive plants in Downtown Dawson City 2008 Moose survey: Dawson early-winter 2008 Environmental change and traditional use of the Old Crow Flats in northern Canada: an IPY opportunity to meet the challenges of the new northern research paradigm Distribution and abundance of Dall's sheep in the Richardson Mountains, August 2003 Distribution and abundance of Dall's sheep in the Richardson Mountains, June 2001 Synthesis of Survival Rates and Causes of Mortality in North American Wolverines