The westward spread of the barred owl

Houston, C. Stuart; McGowan, Kevin J.

doi:10.29173/bluejay5645

Cited by 8 publications

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“…Since the early 1900s, Barred Owls have rapidly expanded their range westward across central Canada and southward into Idaho, Montana, Washington, Oregon, and northern California (Fig. 1; Grant 1966; Taylor & Forsman 1976; Wright 1977; Dunbar et al 1991; Wright & Hayward 1998; Houston & McGowan 1999; Holt et al 2001; Kelly et al 2003). They first appeared in Washington in 1965 (Reichard 1974), in Oregon in 1974 (Taylor & Forsman 1976), and in California in 1981 (Dark et al 1998).…”

Section: Introductionmentioning

confidence: 99%

Genetic Identification of Spotted Owls, Barred Owls, and Their Hybrids: Legal Implications of Hybrid Identity

Haig

Mullins

Forsman

et al. 2004

Conservation Biology

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Recent population expansion of Barred Owls ( Strix varia) into western North America has led to concern that they may compete with and further harm the Northern Spotted Owl ( S. occidentalis caurina), which is already listed as threatened under the U.S. Endangered Species Act (ESA). Because they hybridize, there is a legal need under the ESA for forensic identification of bothThis article is a U.S. government work, and is not subject to copyright in the United States.

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Section: Introductionmentioning

confidence: 99%

Genetic Identification of Spotted Owls, Barred Owls, and Their Hybrids: Legal Implications of Hybrid Identity

Haig

Mullins

Forsman

et al. 2004

Conservation Biology

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Home Range Attributes and Habitat Selection of Barred Owls and Spotted Owls in an Area of Sympatry

Hamer¹,

Forsman

Glenn

2007

The Condor

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We compared home range areas and habitat selection of radio-marked Spotted Owls (Strix occidentalis) and Barred Owls (Strix varia) in an area of sympatry in the northern Cascade Range of Washington in 1986–1989. On average, home ranges of Spotted Owls were 3–4 times larger than ranges of Barred Owls, and there was little overlap of home ranges during the breeding season. Ranges of both species tended to expand during winter. Home range size of both species was negatively correlated with the amount of old forest, but the negative slope of the regression was much steeper for Spotted Owls than for Barred Owls. For both species, home ranges of individual owls typically had high overlap among seasons and years, indicating high site fidelity. Barred Owls generally occupied home ranges at lower elevations than Spotted Owls (mean = 386 ± 27 m vs. 750 ± 68 m). Both species tended to use old forests more than expected, but Spotted Owls tended to use other cover types less than expected, whereas Barred Owls used most other cover types in proportion to their availability. We suggest that Spotted Owls may use larger ranges than Barred Owls because they prey selectively on a few species of nocturnal mammals, whereas Barred Owls forage more evenly across a broad range of prey types, including diurnal and aquatic species. The low overlap of Barred Owl and Spotted Owl home ranges suggests that territorial Barred Owls exclude Spotted Owls from their territories, at least during the breeding season, thus reducing the amount of habitat available to Spotted Owls.

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Distributional Dynamics of Invasion and Hybridization by Strix Spp. In Western North America

Monahan

Hijmans

2007

Ornithol Monogr

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The westward spread of the barred owl

Cited by 8 publications

References 0 publications

Genetic Identification of Spotted Owls, Barred Owls, and Their Hybrids: Legal Implications of Hybrid Identity

Genetic Identification of Spotted Owls, Barred Owls, and Their Hybrids: Legal Implications of Hybrid Identity

Home Range Attributes and Habitat Selection of Barred Owls and Spotted Owls in an Area of Sympatry

Distributional Dynamics of Invasion and Hybridization by Strix Spp. In Western North America

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