Individual study: Reintroduced bighorn sheep: fitness consequences of adjusting parturition to local environments
Whiting J.C., Bowyer R.T., Flinders J.T. & Eggett D.L. (2011) Reintroduced bighorn sheep: fitness consequences of adjusting parturition to local environments. Journal of Mammalogy, 92, 213-220
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Translocate to re-establish or boost populations in native range
A replicated study in 2000–2007 in two mountain sites in northern Utah, USA (Whiting et al. 2011) found that following translocation of bighorn sheep Ovis canadensis, 48–98% of young descended from these animals survived into their first winter. The average survival of bighorn sheep lambs to their first winter was 48% at one site and 55–98% at the second site. In January and February 2000–2002 and 2007, one hundred and fourteen wild-born bighorn sheep (including 92 adult females) were translocated to Mount Timpanogos (67 females, 11 males, 4 young) and Rock Canyon (25 females, 4 males, 3 young). Thirty-one individuals on Mount Timpanogos and 10 in Rock Canyon were fitted with radio-collars. Collared and uncollared females were relocated every 4–5 days from April–July 2001–2007 to count the number of young born. The number of young that survived to their first winter was determined by comparing the highest number of young observed during winter (October to March) with the number observed in the previous spring (April to July).
(Summarised by Ricardo Rocha)