Northern Spotted Owl (Strix occidentalis caurina) reproduction and turnover (when an owl died or shifted territories, and was replaced by another owl) were monitored at 51 locations on Simpson Timber Company lands, northwestern California, from 1991–1995. We tested for differences in proportions of five stand age classes and reproductive success between Spotted Owl pair sites with (≥1 turnover) and without turnovers. Owl pairs at sites without turnovers fledged more young, showed more consistent reproductive success, and were surrounded by a greater percentage of 21–40-yr-old stands than were owl pairs at sites with turnovers. We hypothesize that pairs with high mate fidelity and survival were more reproductively successful because those pairs had previous breeding experience together. By investigating turnover along with habitat features, we now have an indication of the relative quality of various habitats for Spotted Owls on managed, coastal forests of northern California.
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1 January 2000
SPOTTED OWL TURNOVER AND REPRODUCTION IN MANAGED FORESTS OF NORTH-COASTAL CALIFORNIA
Darrin M. Thome,
Cynthia J. Zabel,
Lowell V. Diller
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Journal of Field Ornithology
Vol. 71 • No. 1
January 2000
Vol. 71 • No. 1
January 2000