[PDF] A synopsis of suggested approaches to address potential competitive interactions between Barred Owls (Strix varia) and Spotted Owls (S. occidentalis) | Semantic Scholar

An overview of the barred owl’s range expansion and detail is provided and previously published literature on spotted and barred owls within the range of the spotted owl as related to potential future outcomes for the northern spotted owl is synthesized.

A precedent-setting removal study in which as many as 2150 to 4650 Barred Owls would be killed would result in the death of 36 times more raptors than in all other conservation-based projects combined in the United States and its territories, and 84 times more Raptor deaths than in the largest ongoing effort worldwide.

Investigation of response behavior, detection probabilities, and landscape occupancy patterns of barred owls in western Oregon, USA, during conspecific versus spotted owl call-broadcast surveys suggest that research and management strategies to address potential competitive interactions between spotted owls and barred owl will require carefully designed, species-specific survey methods.