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Elkin, Brett

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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