In this study, the average core area of the owls’ pre-fire forest habitat was 106 ha with a greater proportion of hardwoods compared to an average core area of 180 ha in the Sierra in which conifers dominate.
Lee, D.E., M.L. Bond, M.I. Borchert, and R. Tanner. 2013. Influence of fire and salvage logging on site occupancy of spotted owls in the San Bernardino and San Jacinto Mountains of southern California. The Journal of Wildlife Management 77: 1327-1341.