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Barred Owls and Landscape Attributes Influence Territory Occupancy of Northern Spotted Owls Public Deposited

https://ir.library.oregonstate.edu/concern/articles/47429c072

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article was published by John Wiley & Sons Ltd. and is in the public domain. The published article can be found at:  http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291937-2817.

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  • We used multi-season occupancy analyses to model 2 fates of northern spotted owl territories in relation to habitat amount, habitat fragmentation, and the presence of barred owls in Washington State, USA, 1989–2005. Local colonization is the probability a territory unoccupied by a spotted owl in year i would be occupied in year i + 1, and local extinction is the probability a territory that was occupied by a spotted owl in year i would be unoccupied in year i + 1. We found a negative relationship between local extinction probability and amount of late-seral forest edge. We found a negative relationship between colonization probability and the number of late-seral forest patches (higher fragmentation), and a negative relationship between colonization probability and the amount of non-habitat within 600 m of a spotted owl territory center (Akaike weight = 0.59). The presence of barred owls was positively related to extinction probability and negatively related to detection probability of spotted owls. The negative relationship between presence of barred owls and detectability of spotted owls indicated that spotted owls could be modifying their calling behavior in the presence of barred owls. The positive relationship between barred owl detections and local extinction probability suggests that because of competition with barred owls, spotted owls are being displaced.
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  • Sovern, S. G., Forsman, E. D., Olson, G. S., Biswell, B. L., Taylor, M., & Anthony, R. G. (2014). Barred owls and landscape attributes influence territory occupancy of northern spotted owls. Journal of Wildlife Management, 78(8), 1436-1443. doi:10.1002/jwmg.793
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  • This study was funded by the USDA Forest Service Pacific Northwest Regional Office and Pacific Northwest Research Station. In-kind support was also provided by the Department of Fisheries and Wildlife at Oregon State University and by the Oregon Cooperative Wildlife Research Unit.
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  • description.provenance : Made available in DSpace on 2014-12-08T21:37:12Z (GMT). No. of bitstreams: 2 SovernStanFisheriesWildlifeBarredOwlsLandscape.pdf: 390091 bytes, checksum: 05dde795de762c643efed2c1a177b086 (MD5) SovernStanFisheriesWildlifeBarredOwlsLandscape_SupportingInformation.pdf: 162274 bytes, checksum: 62e16b5fd1a539d4972f75446dbeb54c (MD5) Previous issue date: 2014-11
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-12-08T21:36:57Z No. of bitstreams: 2 SovernStanFisheriesWildlifeBarredOwlsLandscape.pdf: 390091 bytes, checksum: 05dde795de762c643efed2c1a177b086 (MD5) SovernStanFisheriesWildlifeBarredOwlsLandscape_SupportingInformation.pdf: 162274 bytes, checksum: 62e16b5fd1a539d4972f75446dbeb54c (MD5)
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-12-08T21:37:12Z (GMT) No. of bitstreams: 2 SovernStanFisheriesWildlifeBarredOwlsLandscape.pdf: 390091 bytes, checksum: 05dde795de762c643efed2c1a177b086 (MD5) SovernStanFisheriesWildlifeBarredOwlsLandscape_SupportingInformation.pdf: 162274 bytes, checksum: 62e16b5fd1a539d4972f75446dbeb54c (MD5)

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