The purpose of our study was to determine if estimates of survival and fecundity from the United States could be used to model the population of Northern Spotted Owls in BC. British Columbia is the northern limit of the species' range and perhaps these parameters at this limit differ from those in more southerly regions. We extracted environmental data, such as snowfall and annual precipitation, from regional maps. We correlated these environmental variables with population parameters of Northern Spotted Owls from various study areas in the Pacific Northwest. We detected several significant correlations; for example, survivorship was negatively correlated to indices of winter climate, such as snowfall and positively correlated with freeze free periods. These findings indicate that managers should use estimates of survivorship and possibly fecundity that are lower than mean values from United States when modeling spotted owl populations in BC. Estimates of survivorship and fecundity are needed to improve models and help guide management of Spotted Owls in BC.
Main, Brita, Harestad, Alton S.. 2004. Climatic indices and population parameters of northern spotted owls: implications to management in British Columbia. Forest Investment Account (FIA) - Forest Science Program. Forest Investment Account Report. FIA2004MR002