NDLI: The Invasion of Barred Owls and its Potential Effect on the Spotted Owl: a Conservation Conundrum

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Biological Invasions : Volume 9, Issue 1, January 2007

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The Invasion of Barred Owls and its Potential Effect on the Spotted Owl: a Conservation Conundrum

Content Provider	Springer Nature Link
Author	Gutiérrez, R. J. Cody, M. Courtney, S. Franklin, Alan B.
Copyright Year	2006
Abstract	The spotted owl (Strix occidentalis) is a threatened species in many areas of its western North American range. Concomitant with its decline has been a rapid invasion of its range and habitat by barred owls (Strix varia), a native species that was restricted, until relatively recently, to eastern North America. We assess the theoretical potential for negative interactions between these two owls by examining size dimorphism and ecological relationships within various owl assemblages throughout the world. We then review the anecdotal, natural history, modeling, and experimental evidence that suggest barred owls may negatively affect spotted owls with at least a potential for the competitive exclusion of spotted owls by barred owls throughout all or part of the former’2019;s range. While it is widely accepted that barred owls are either causing or exacerbating declines of spotted owl populations, there are confounding factors, such as habitat loss and bad weather that also may contribute to declines of spotted owls. Both theory and empirical information suggest that barred owls are likely to have negative effects on spotted owl range and density, but the degree of the impact is not predictable. There is a conservation conundrum here, in that the barred owl is a native species that has expanded its range westwards, either naturally or with a degree of human facilitation, and now constitutes a major threat to the viability of another native species, the threatened spotted owl. We propose that only through carefully designed experiments involving removal of barred owls will we be able to determine if recent declines in spotted owl populations are caused by barred owls or by other factors. It is rare in conservation science that replicate study areas exist for which we also have long-standing demographic information, as is the case with the spotted owl. Removal experiments would take advantage of the wealth of data on spotted owls, and allow ecologists to assess formally the impacts of an invasive species on a threatened species, as well as to suggest mitigation measures.
Starting Page	181
Ending Page	196
Page Count	16
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	9
Issue Number	2
e-ISSN	15731464
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-06-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Barred owl Common species invading range of threatened species Competition Spotted owl Strix occidentalis Strix varia Plant Sciences Forestry Zoology Hydrobiology Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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A synopsis of suggested approaches to address potential competitive interactions between Barred Owls (Strix varia) and Spotted Owls (S. occidentalis)

Effects of barred owl (Strix varia) range expansion on Haemoproteus parasite assemblage dynamics and transmission in barred and northern spotted owls (Strix occidentalis caurina)

Genomic variation and population histories of spotted (Strix occidentalis) and barred (S. varia) owls

Genomics of the Spotted Owl (Strix occidentalis) and Barred Owl (Strix varia) in Western North America

Genomic Variation and Recent Population Histories of Spotted (Strix occidentalis) and Barred (Strix varia) Owls

Characterizing juvenile dispersal dynamics of invasive barred owls: implications for management (Dataset)

Using Detection Dogs to Conduct Simultaneous Surveys of Northern Spotted (Strix occidentalis caurina) and Barred Owls (Strix varia)

Whole-genome analysis of introgression between the spotted owl and barred owl (Strix occidentalis and Strix varia, respectively; Aves: Strigidae) in western North America

Northern Spotted Owl (Strix occidentalis caurina) Genome: Divergence with the Barred Owl (Strix varia) and Characterization of Light-Associated Genes

The Invasion of Barred Owls and its Potential Effect on the Spotted Owl: a Conservation Conundrum

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