Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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Competitive interactions and resource partitioning between northern spotted owls and barred owls in western Oregon


January 2007 - September 2011


The purpose of this research project is to develop a better understanding of the competitive relationships between northern spotted owls and barred owls, including exploitation of common resources and behavioral interactions. Specific objectives are to:
1) Describe size and spatial overlap of home ranges in areas where the species co-occur.
2) Compare diets and habitat associations of the two species with respect to:
a) differences among seasons,
b) assessment of prey preference, and
c) computation of habitat selection.
3) Investigate resource partitioning based on indices of overlap in use of space, habitats, and food resources.
4) Investigate behavioral interactions between the two species to determine dominance-subordinance relations.
5) Estimate survival rates of the two species


Current Staff

Federal Staff: 95

Masters Students: 239

Phd Students: 142

Post Docs: 53

University Staff: 240

5 Year Summary

Students graduated: 701

Scientific Publications: 1936

Presentations: 4260



  • Robert AnthonyPrincipal Investigator

Funding Agencies

  • Forest and Rangeland Ecosystem Science Center

Cooperative Research Units Program Headquarters Cooperators

  1. U.S. Geological Survey