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24 results found
Silvicultural prescriptions to enhance northern flying squirrel (Glaucoinys sabrinus) habitat have been suggested as an aid for recovery of the threatened northern spotted owl (Strix occidentalis caurina). Flying squirrels are hypothesized to be limited by den sites (cavities in…
Author(s): A.B. Carey, T.M. Wilson, C.C. Maguire, B.L. Biswell
Keywords: cavity, den, Glaucomys sabrinus, nest, northern flying squirrel, old growth, Oregon, Pacific Northwest, prey, spotted owl, telemetry, Washington
Source: Journal of Wildlife Management. 61(3): 684-699
Year: 1997
A review of literature on habitat associations of owls of the world revealed that about 83 species of owls among 18 genera are known or suspected to be closely associated with old forests. Old forest is defined as old-growth or undisturbed forests, typically with dense canopies. The 83 owl species…
Author(s): Bruce G. Marcot
Keywords: Owls, old growth, old-growth forest, late-successional forests, spotted owl, owl calls, owl conservation, tropical forests, literature review
Source: Gen. Tech. Rep. PNW-GTR-343. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 64 p
Year: 1995
Home ranges of 14 pairs of spotted owls (Strix occidentalis) were studied over four to six seasons in three southwest Oregon landscapes that differed in prey base and degree of forest fragmentation. The general theory of space use and the biology of spotted owls was used to construct a…
Author(s): A.B. Carey, K.C. Peeler
Keywords: home range, optimal foraging, Oregon, space use, spotted owl, Strix occidentalis
Source: Journal of Raptor Research. 29(4): 223-239
Year: 1995
For decades, softwood log exports were an important component of international wood products trade from the Pacific Northwest (PNW) region of the United States. Log exports to the Pacific Rim began in earnest after the Columbus Day Storm of 1962 generated billions of board feet of salvaged timber.…
Author(s): Jean M. Daniels
Keywords: Log exports, forest products trade, softwood log trade, Japan, globalization, Pacific Northwest trade, spotted owl
Source: Gen. Tech. Rep. PNW-GTR-624. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 80 p
Year: 2005
A basic sampling scheme is proposed to estimate the proportion of sampled units (Spotted Owl Habitat Areas (SOHAs) or randomly sampled 1000-acre polygon areas (RSAs)) occupied by spotted owl pairs. A bias adjustment for the possibility of missing a pair given its presence on a SOHA or RSA is…
Author(s): David L. Azuma, James A. Baldwin, Barry R. Noon
Keywords: spotted owl, SOHA, sampling scheme, bias adjustment, occupancy
Source: Gen. Tech. Rep. PSW-124. Berkeley, Calif.: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 9 p
Year: 1990
The paper is a practical guide to field methodology for conducting a radio telemetry study of spotted owls (Strix occidentalis) in mountainous terrain. It begins with a synopsis of spotted owl biology and basic telemetry. The criteria used to select which owls will carry transmitters are…
Author(s): J.H. Guetterman, J.A. Burns, J.A. Reid, R.B. Horn, C.C. Foster
Keywords: Radio telemetry, Strix occidentalis, spotted owl, Pacific Northwest, methods
Source: Gen. Tech. Rep. PNW-GTR-272. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station
Year: 1991
Concern for viable spotted owl (Strix occidentalis) populations has played prominently in the management of western forests in the United States. Historically, much of the debate has focused on the impacts of commercial timber harvest. Increasingly, the conflict is shifting to the habitat needs of…
Author(s): Danny C. Lee, Larry L. Irwin
Keywords: spotted owl, Strix occidentalis, wildland fire, canopy cover, forest thinning, risk assessment
Source: Forest Ecology and Management, Vol. 211: 191-209
Year: 2005
Barred Owls (Strix varia) have expanded their range throughout the ranges of northern (Strix occidentalis caurina) and California spotted owls (S. o. occidentalis). Field observations have suggested that barred owls may be behaviorally dominant to spotted owls. Therefore…
Author(s): M.L. Crozier, M.E. Seamans, R.J. Gutierrez, P.J. Loschl, R.B. Horn, S.G. Sovern, E.D. Forsman
Keywords: Barred owl, behavior, crossover experiment, interspecific competition, spotted owl, vocalization
Source: The Condor. 108: 760-769
Year: 2006
Population genetics plays an increasingly important role in the conservation and management of declining species, particularly for defining taxonomic units. Subspecies are recognized by several conservation organizations and countries and receive legal protection under the US Endangered Species Act…
Author(s): W.Chris Funk, Eric D. Forsman, Thomas D. Mullins, Susan M. Haig
Keywords: conservation, introgression, long-distance dispersal, microsatellites, spotted owl, Strix occidentalis, subspecies, US Endangered Species Act
Source: Evolutionary Applications. 1: 161-171
Year: 2008
Several recently emplaced and potential Northwest timber policies are causing considerable market turbulence. Estimated were price and volume changes induced by three supply-side policies (a state-log export embargo, forest replanning, and spotted owl reservations) and the demand slide of 1990-91.…
Author(s): Donald F. Flora, Wendy J. McGInnls
Keywords: Markets (external), supply and demand (forest products), trade (Pacific Rim), log exports, lumber exports, spotted owl, forest planning
Source: Res. Pap. PNW-RP-445. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 15 p
Year: 1992