Cooperative Fish and Wildlife Research Units Program: Oregon
Education, Research and Technical Assistance for Managing Our Natural Resources

Oregon Project

Competitive interactions and resource partitioning between northern spotted owls and barred owls in western Oregon

January 2007 - September 2011


Participating Agencies

  • Forest and Rangeland Ecosystem Science Center

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