Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern
Help
 

GeoTreesearch


Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

(496 KB)

Title: Nest reuse by Northern Spotted Owls on the east slope of the Cascade Range, Washington

Author: Sovern, Stan G.; Taylor, Margaret; Forsman, Eric D.

Date: 2011

Source: Northwestern Naturalist. 92: 101-106

Publication Series: Scientific Journal (JRNL)

Description: During a long-term demography study of Northern Spotted Owls (Strix occidentalis caurina) in the eastern Cascade Range of Washington State in 1989 to 2008, we documented 276 nests of Northern Spotted Owls at 73 different territories. Of these nests, 90.2% were on platforms, mostly in clumps of deformed limbs caused by dwarf mistletoe (primarily Arceuthobium douglasii), and 9.8% were in cavities in trees. Of the nests associated with dwarf mistletoe, 8.4% were nests built by other raptors and 91.6% were either natural accumulations of debris or debris accumulated by other birds or mammals. Owls switched nests between nesting attempts 81.2% of the time. The presence of a new male or female at a territory did not affect the odds of switching nests between nesting attempts. The odds an owl would reuse a nest were 6 times greater for owls that were successful in the previous nesting attempt compared to owls that were unsuccessful, given the same type of nest structure. The odds an owl would reuse a cavity nest were 4.7 times greater than the odds an owl would reuse a platform nest, given the same level of nest success the previous year. The estimated mean annual survival rate of nest structures was 0.98, suggesting that mean life expectancy of nests was 42 y. However, nests on dwarf mistletoe platforms may be more ephemeral than cavity nests or the nest trees themselves, and management for viable nest areas for Spotted Owls should include multiple trees with mistletoe brooms suitable for alternate nests. Our results, and results from other studies, indicate that Douglas-fir (Pseudotsuga menziesii) trees infected with dwarf mistletoe are an important habitat component for Spotted Owls and many other species of birds and arboreal mammals on the east slope of the Cascade Range in Washington.

Keywords: Arceuthobium douglasii, dwarf mistletoe, eastern Cascade Range, nesting, Northern Spotted Owl, Strix occidentalis caurina, Washington

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Sovern, Stan G.; Taylor, Margaret; Forsman, Eric D. 2011. Nest reuse by Northern Spotted Owls on the east slope of the Cascade Range, Washington. Northwestern Naturalist. 92: 101-106.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.