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    We used radiotelemetry to determine habitat use by flammulated owls (Otus flammeolus) during the breeding season on 452 ha of montane conifer forest in central Colorado in 1982-1983. Mean size and SD of home ranges was 11.1 +/- 1.9 ha (range = 8.5-12.5 ha, n = 4) in 1982 and 18.3 +/- 5.1 ha (range = 14.0-24.0 ha, n = 3) in 1983. Habitat use by nesting males was affected by distribution of old forests of ponderosa pine (Pinus ponderosa) mixed with Douglas-fir (Pseudotsuga menziesii), by topography, and by juxtaposition of home ranges of conspecifics. In spring, both new and returning owls settled into areas containing more old ponderosa pine/Douglas-fir than in other overstory types available in the study area. After settling, males foraged significantly more often in old ponderosa pine/Douglas-fir than in other overstory types available within home ranges. Eighty-one percent of foraging locations by males occurred in one to four intensive foraging areas within each home range. Mean size of intensive foraging areas was 0.5 +/- 0.4 ha (range = 0.1-1.4 ha). Eighty percent of intensive foraging areas consisted entirely of old ponderosa pine/Douglas-fir. Use of this overstory type by flammulated owls is probably related to its composition and structure, and prey availability.

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    Linkhart, Brian D.; Reynolds, Richard T.; Ryder, Ronald A. 1998. Home range and habitat of breeding flammulated owls in Colorado. The Wilson Bulletin. 110(3): 342-351.


    flammulated owls, Otus flammeolus, ponderosa pine, habitat use, foraging areas

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