Sheep Losses to Predators on a California Range, 1973-1983

摘要: Predation at the University of California Hopland Field Station was evaluated for an ll-year period beginning in 1973. Of those lambs placed on range, average 2.7% were killed each year by predators. An 1.5% ewes killed. When number missing animals which estimated, annual predation rate and 10.4 3.8%, respectively. For all known ewe lamb deaths, respectively, 45% 26% caused predators, 14% 28% died from causes other than predation, 41% 46% unknown causes. sheep 89% coyotes (Canis r superintendent animal resource supervisor. Station, 4070 Road, Hopland, 95449. I he authors thank D.M. Center. R.M. Dally. C.E. Vaughn reviewing manuscript. Manuscript accepted November 20. 1984 livestock losses occurring during a few years. While short-term studies provide useful information, conclusions based such research must be made with caution because factors as predator density, environmental conditions, availability alternate prey vary annually may influence predation. Generally, regarding to predators are more reliable when long-term data used; however, rare. The purpose this study evaluate economic l-year 1973 a. operation northern coastal area