Demography of mountain sheep in the East Chocolate Mountains, California
Date of Original Version
We estimated the total population size and sex and age ratios of mountain sheep, Ovis canadensis nelsoni, in the East Chocolate Mountains, Imperial County, California during 1992-1993. We collected data using ground observations, remote cameras, and helicopter surveys. Mark-recapture population estimates were based on 17 females and 8 males that had been fitted with radio collars. Of the three methods, only helicopter surveys met the assumptions inherent in mark-recapture sampling methodology. Based on helicopter surveys, we estimated that 160 animals inhabited the study area during 1993, with a 95% confidence interval of 138-203 individuals. The adult sex ratio was 74 males:100 females. Yearling ratios (13:100 females), fall lamb ratios (38:100 females) and high annual adult survivorship (0.95) suggest that the population increased during 1993.
Publication Title, e.g., Journal
California Fish and Game
Andrew, Nancy G., Vernon C. Bleich, Peter V. August, and Steven G. Torres. "Demography of mountain sheep in the East Chocolate Mountains, California." California Fish and Game 83, 2 (1997). https://digitalcommons.uri.edu/nrs_facpubs/320