AVIS-IBIS

Birds of Indian Subcontinent

Distribution, Density, and Age Structure of Spotted Owls on Two Southern California Habitat Islands

Publication Type:Journal Article
Year of Publication:1990
Authors:Gutiérrez, RJ, Pritchard, J
Journal:The Condor
Volume:92
Issue:2
Date Published:1990
ISBN Number:00105422
Keywords:Ciccaba, Ciccaba occidentalis, Strigidae, Strix, Strix occidentalis
Abstract:We estimated the distribution and density of California Spotted Owls (Strix occidentalis occidentalis) occurring on Mt. San Jacinto during 1988 and 1989 and on Palomar Mountain during 1988, southern California. Spotted Owls on Mt. San Jacinto were well distributed above 1,000 m in forested habitats. In contrast, owl distribution appeared to be affected by recent fires on Palomar Mountain. Densities on Mt. San Jacinto were estimated to be 0.16 owls/km2 in 1988 and 0.19 owls/km2 in 1989. The density estimate for Palomar Mountain was 0.64 owls/km2. The proportion of subadults in both of these isolated populations was over twice that reported for large contiguous populations of Spotted Owls which suggested a higher adult mortality in the insular populations. The fecundity of these insular populations was either lower than or similar to the Northern Spotted Owl (S. occidentalis caurina).
URL:http://www.jstor.org/stable/1368246
Short Title:The Condor
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