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Roosting Habitat Use and Selection By Northern Spotted Owls During Natal Dispersal

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Abstract
  • We studied habitat selection by northern spotted owls (Strix occidentalis caurina) during natal dispersal in Washington State, USA, at both the roost site and landscape scales. We used logistic regression to obtain parameters for an exponential resource selection function based on vegetation attributes in roost and random plots in 76 forest stands that were used for roosting. We used a similar analysis to evaluate selection of landscape habitat attributes based on 301 radio-telemetry relocations and random points within our study area. We found no evidence of within-stand selection for any of the variables examined, but 78% of roosts were in stands with at least some large (>50 cm dbh) trees. At the landscape scale, owls selected for stands with high canopy cover (>70%). Dispersing owls selected vegetation types that were more similar to habitat selected by adult owls than habitat that would result from following guidelines previously proposed to maintain dispersal habitat. Our analysis indicates that juvenile owls select stands for roosting that have greater canopy cover than is recommended in current agency guidelines.
  • Keywords: Dispersal habitat, Radio-telemetry, Washington, Logistic regression, Northern spotted owl, Strix occidentalis caurina
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  • Sovern, S. G., Forsman, E. D., Dugger, K. M., & Taylor, M. (2015). Roosting habitat use and selection by northern spotted owls during natal dispersal. Journal of Wildlife Management, 79(2), 254-262. doi:10.1002/jwmg.834
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  • 79
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  • 2
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  • Funding was provided by the United States Department of Agriculture Forest Service, Pacific Northwest Regional Office and Pacific Northwest Research Station; United States Department of Interior (USDI) Bureau of Land Management, Oregon State Office; and USDI United States Geological Survey, Biological Resources Division, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon. The USDI Fish and Wildlife Service provided funding for aircraft searches.
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