Journal articles: 'Barred Owl'

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Offutt, Chris. "Barred Owl." Iowa Journal of Cultural Studies 1994, no. 13 (1994): 160–69. http://dx.doi.org/10.17077/2168-569x.1185.

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Crozier, Michelle L., Mark E. Seamans, R. J. GutiÉRrez, Peter J. Loschl, Robert B. Horn, Stan G. Sovern, and Eric D. Forsman. "Does The Presence of Barred Owls Suppress the Calling Behavior of Spotted Owls?" Condor 108, no. 4 (November 1, 2006): 760–69. http://dx.doi.org/10.1093/condor/108.4.760.

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Abstract Abstract Barred Owls (Strix varia) have expanded their range throughout the ranges of Northern (Strix occidentalis caurina) and California Spotted Owls (S. o. occidentalis). Field observations have suggested that Barred Owls may be behaviorally dominant to Spotted Owls. Therefore, we conducted a test of behavioral dominance by assessing responsiveness of Spotted Owls to conspecific calls when they were in the simulated presence (i.e., imitation of Barred Owl vocalizations) of a Barred Owl. We hypothesized that Spotted Owls would be less likely to respond to conspecific calls in areas where Barred Owls were common. We used a binary 2 × 2 crossover experimental design to examine male Spotted Owl responses at 10 territories randomly selected within two study areas that differed in abundance of Barred Owls. We also conducted a quasi experiment at four study areas using response data from any Spotted Owl (male or female) detected following exposure to Barred Owl calls. We inferred from the crossover experiment that the simulated presence of a Barred Owl might negatively affect Spotted Owl responsiveness. Both subspecies of Spotted Owl responded less to Spotted Owl calls after exposure to Barred Owl calls, Northern Spotted Owls responded less frequently in areas having higher numbers of Barred Owls, and California Spotted Owls responded less frequently than Northern Spotted Owls overall.

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Kelly, Elizabeth G., Eric D. Forsman, and Robert G. Anthony. "Are Barred Owls Displacing Spotted Owls?" Condor 105, no. 1 (February 1, 2003): 45–53. http://dx.doi.org/10.1093/condor/105.1.45.

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Abstract Barred Owls (Strix varia) have expanded their range into the Pacific Northwest, and anecdotal evidence suggests that they may be displacing the federally threatened Northern Spotted Owl (Strix occidentalis caurina). Our objectives were to describe the current status of Barred Owls in Oregon and compare occupancy of Spotted Owls in historic Spotted Owl territories before and after Barred Owls were first detected in those territories. Between 1974 and 1998, we estimated that 706 different Barred Owl territories were located in Oregon. From 1989–1998 an average of 60 new Barred Owl territories were located in Oregon each year. In Spotted Owl demographic study areas in Oregon and Washington, Barred Owl detections increased at Spotted Owl territories from 1987–1999. Occupancy of Spotted Owl territories declined after Barred Owls were detected within 0.80 km of the territory center. When Barred Owls were detected 0.81–2.40 km from Spotted Owl territory centers, occupancy of Spotted Owls was only marginally less than at territories without Barred Owls. This suggests that the frequency and intensity of interactions between the two species is negatively associated with distance between them. Our results suggest that land managers and regulatory agencies should regard Barred Owls as a threat to Spotted Owls, particularly if Barred Owls continue to increase in number as they have during the past 25 years. ¿Está Strix varia Desplazando a Strix occidentalis caurina? Resumen. Desde su expansión hacia el Pacífico Noroeste, existe evidencia anecdótica de que Strix varia podría estar desplazando a S. occidentalis caurina. Nuestros objetivos fueron describir el estatus actual de S. varia en Oregon y comparar la ocurrencia de S. occidentalis caurina en sus territorios históricos antes y después de que S. varia se detectó por primera vez en dichos territorios. Entre 1974 y 1998, estimamos que se confirmaron 706 territorios diferentes de S. varia en Oregon. Entre 1989 y 1998, se localizaron en promedio 60 nuevos territorios de S. varia anualmente. En áreas con estudios demográficos de S. occidentalis caurina en Oregon y Washington, las detecciones de S. varia en territorios de S. occidentalis caurina se incrementaron entre 1987 y 1999. En comparación con territorios sin S. varia, la ocupación de territorios de S. occidentalis caurina disminuyó luego de que se detectaron individuos de S. varia a menos de 0.80 km del centro del territorio. Cuando se detectaron individuos de S. varia entre 0.81 y 2.40 km del centro de los territorios, la ocupación de éstos fue sólo marginalmente menor que en territorios sin S. varia. Esto sugiere que la frecuencia e intensidad de la interacción entre las dos especies está asociada con la distancia entre ellas. Nuestros resultados sugieren que las autoridades ambientales y de regulación deben considerar a S. varia como una amenaza para S. occidentalis caurina, particularmente si los números de S. varia se siguen incrementando como en los últimos 25 años.

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Priestley, Lisa Takats. "The Barred Owl, Strix varia in Alberta: Distribution and Status." Canadian Field-Naturalist 118, no. 2 (April 1, 2004): 215. http://dx.doi.org/10.22621/cfn.v118i2.916.

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Barred Owl distribution and status in Alberta were investigated using over 300 individual records (1912 through 1999) that were collected from literature, museum/zoo specimens, nest cards, bird surveys, volunteer raptor banders, and naturalists. Barred Owls were distributed throughout much of the boreal forest, aspen parkland, foothill, and mountain ecoregions of Alberta. Fifty-four breeding records (46 nests) were found. Barred Owls were associated with older forests and had a clumped distribution, predominantly along water where larger Balsam Poplar trees provide nesting sites. According to Alberta's "Status of Alberta Wildlife 2000" criteria, the Barred Owl should be assessed as Sensitive. There is no evidence that Barred Owls have expanded their range in Alberta in the last 100 years; rather, they have maintained their distribution.

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McGarigal, Kevin, and James D. Fraser. "Barred Owl Responses to Recorded Vocalizations." Condor 87, no. 4 (November 1985): 552–53. http://dx.doi.org/10.2307/1367961.

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Graves, Gary R., and Gerald J. Niemi. "POSSIBLE PREDATION OF GREAT GRAY OWL BY A BARRED OWL." Journal of Raptor Research 40, no. 2 (June 2006): 175. http://dx.doi.org/10.3356/0892-1016(2006)40[175:ppoggo]2.0.co;2.

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Berry, Glori. "Season and Age as Factors in Barred Owl (Strix varia) Admissions." Wildlife Rehabilitation Bulletin 30, no. 1 (June 30, 2012): 15–22. http://dx.doi.org/10.53607/wrb.v30.58.

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Barred owl admittance data from Avian Haven, a wildlife rehabilitation facility in central Maine, were examined from April 2005 through March 2011. During this time, 231 barred owls were admitted to the facility, excluding nestlings. A significantly greater number of owls were admitted in the fall and winter months than in the spring and summer months; yearly variations in the fall and winter month admissions also were significant, while those for the spring and summer month admissions were not. Furthermore, a statistically significant proportion of 44 barred owls aged during the 2010/2011 fall/winter season were hatch–year birds, suggesting that yearly variations in barred owl admittance numbers are directly correlated with the number of dispersing hatch–year birds. Finally, in aging the barred owls for this study, a technique using an ultraviolet light source in the form of a black light to examine the fluorescence of porphyrin pigments in the feathers of owls was investigated. It was found to be reliable in differentiating hatch–year owls from adult (after–hatch–year) owls having undergone a partial molt, and has the potential for becoming the definitive method for aging barred owls in a rehabilitation setting.

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Hamer, Thomas E., Eric D. Forsman, and Elizabeth M. Glenn. "Home Range Attributes and Habitat Selection of Barred Owls and Spotted Owls in an Area of Sympatry." Condor 109, no. 4 (November 1, 2007): 750–68. http://dx.doi.org/10.1093/condor/109.4.750.

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Abstract 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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Irwin, Larry L., Dennis F. Rock, Suzanne C. Rock, Amanda K. Heyerly, and Laurie A. Clark. "Barred Owl Effects on Spotted Owl Resource Selection: A Meta‐Analysis." Journal of Wildlife Management 84, no. 1 (November 19, 2019): 96–117. http://dx.doi.org/10.1002/jwmg.21784.

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Schmelzer, Isabelle, and Frank Phillips. "First Record of a Barred Owl, Strix varia, in Labrador." Canadian Field-Naturalist 118, no. 2 (April 1, 2004): 273. http://dx.doi.org/10.22621/cfn.v118i2.929.

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A Barred Owl (Strix varia) was heard calling in central Labrador, Canada in 2001, and a dead owl was found in the same area in 2004. These are the first confirmed records for the Province of Newfoundland and Labrador.

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Wiens, J. David, Robert G. Anthony, and Eric D. Forsman. "Barred owl occupancy surveys within the range of the northern spotted owl." Journal of Wildlife Management 75, no. 3 (April 2011): 531–38. http://dx.doi.org/10.1002/jwmg.82.

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Dark, Shawna J., and Gordon I. Gould,. "The Barred Owl (Strix varia) Invasion in California." Auk 115, no. 1 (January 1998): 50–56. http://dx.doi.org/10.2307/4089110.

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Weinstein, Miriam. "“Whose Woods These Are…,” New Hampshire Barred Owl." Spine 33, no. 2 (January 2008): i. http://dx.doi.org/10.1097/01.brs.0000308384.07094.b1.

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Irwin, Larry L., Dennis F. Rock, and Suzanne C. Rock. "Barred owl habitat selection in west coast forests." Journal of Wildlife Management 82, no. 1 (October 4, 2017): 202–16. http://dx.doi.org/10.1002/jwmg.21339.

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Grossman, S. R., S. J. Hannon, and A. Sánchez-Azofeifa. "Responses of Great Horned Owls (Bubo virginianus), Barred Owls (Strix varia), and Northern Saw-whet Owls (Aegolius acadicus) to forest cover and configuration in an agricultural landscape in Alberta, Canada." Canadian Journal of Zoology 86, no. 10 (October 2008): 1165–72. http://dx.doi.org/10.1139/z08-095.

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Studies on the effects of forest fragmentation on birds have focussed primarily on passerines, with few studies on owls. We assessed the influence of forest amount and configuration on the abundance and distribution of three species of forest owls, Great Horned Owl ( Bubo virginianus (Gmelin, 1788)), Barred Owl ( Strix varia Barton, 1799), and Northern Saw-whet Owl ( Aegolius acadicus (Gmelin, 1788)), in agricultural landscapes with varying amounts of forest cover in central Alberta, Canada. All three species were positively associated with forest cover: Barred Owls were most prevalent in landscapes with >66% forest cover, Great Horned Owls in landscapes with between 36% and 65% forest cover, and Northern Saw-whet Owls in landscapes with between 16% and 100% forest cover. Regression models containing configuration variables were chosen as best models using AIC for all three species. Great Horned Owls were most abundant in landscapes with high heterogeneity: more forest–nonforest edges and higher forest patch area variation. Barred Owls were more likely to occur in landscapes with larger forest patch areas and Northern Saw-whet Owls were more abundant in landscapes that were more connected. These relationships are consistent with predictions based on body size of owls and local habitat relationships described in the literature.

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Whiklo, Todd M., and James R. Duncan. "Characteristics of Barred Owl (Strix varia) nest sites in Manitoba, Canada." Canadian Field-Naturalist 128, no. 1 (March 26, 2014): 38. http://dx.doi.org/10.22621/cfn.v128i1.1548.

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During 2009 and 2010, nine Barred Owl (Strix varia) nest sites were located in Manitoba, Canada, and data on nest trees, nest structure, and nest site habitat were collected. Nests were located in a variety of tree species, including Balsam Poplar (Populus balsamifera), Paper Birch (Betula papyrifera), Trembling Aspen (Populus tremuloides) and Burr Oak (Quercus macrocarpa). All nests were in tree cavities, and the majority of nests were in dead trees (67%) and had lateral openings (67%). Habitat surrounding nest trees and estimated canopy cover were highly variable. Diameter at breast height of nest trees, cavity width, and cavity depth were consistent and were determined to be the most reliable indicators of nest suitability for breeding Barred Owls. We conclude that the distribution of nesting Barred Owls is influenced more by availability of suitable nest sites than by nest tree species or nest site habitat.

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Holt, Denver W., Rob Domenech, and Anne Paulson. "Status and Distribution of the Barred Owl in Montana." Northwestern Naturalist 82, no. 3 (2001): 102. http://dx.doi.org/10.2307/3536484.

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Streby, Henry M., Jeanine M. Refsnider, Sean M. Peterson, and David E. Andersen. "Barred Owl Predation on Hermit Thrush and Ovenbird Fledglings." Journal of Raptor Research 42, no. 4 (December 2008): 296–98. http://dx.doi.org/10.3356/jrr-08-10.1.

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Wiens, J. David, Katie M. Dugger, J. Mark Higley, Damon B. Lesmeister, Alan B. Franklin, Keith A. Hamm, Gary C. White, et al. "Invader removal triggers competitive release in a threatened avian predator." Proceedings of the National Academy of Sciences 118, no. 31 (July 19, 2021): e2102859118. http://dx.doi.org/10.1073/pnas.2102859118.

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Changes in the distribution and abundance of invasive species can have far-reaching ecological consequences. Programs to control invaders are common but gauging the effectiveness of such programs using carefully controlled, large-scale field experiments is rare, especially at higher trophic levels. Experimental manipulations coupled with long-term demographic monitoring can reveal the mechanistic underpinnings of interspecific competition among apex predators and suggest mitigation options for invasive species. We used a large-scale before–after control–impact removal experiment to investigate the effects of an invasive competitor, the barred owl (Strix varia), on the population dynamics of an iconic old-forest native species, the northern spotted owl (Strix occidentalis caurina). Removal of barred owls had a strong, positive effect on survival of sympatric spotted owls and a weaker but positive effect on spotted owl dispersal and recruitment. After removals, the estimated mean annual rate of population change for spotted owls stabilized in areas with removals (0.2% decline per year), but continued to decline sharply in areas without removals (12.1% decline per year). The results demonstrated that the most substantial changes in population dynamics of northern spotted owls over the past two decades were associated with the invasion, population expansion, and subsequent removal of barred owls. Our study provides experimental evidence of the demographic consequences of competitive release, where a threatened avian predator was freed from restrictions imposed on its population dynamics with the removal of a competitively dominant invasive species.

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Acker, Jamie. "Recent Trends in Western Screech-Owl and Barred Owl Abundances on Bainbridge Island, Washington." Northwestern Naturalist 93, no. 2 (September 2012): 133–37. http://dx.doi.org/10.1898/nwn11-21.1.

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Lynn, William S. "Bringing Ethics to Wild Lives: Shaping Public Policy for Barred and Northern Spotted Owls." Society & Animals 26, no. 2 (June 22, 2018): 217–38. http://dx.doi.org/10.1163/15685306-12341505.

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Abstract Ethics reviews are not part of environmental policy or wildlife management in the United States. This changed when, for the first time, the US Fish and Wildlife Service conducted such a review with respect to the barred and northern spotted owls. Spotted owls are endangered throughout their range by a variety of anthropogenic and natural forces. The interspecific competition between barred and spotted owls is a key factor second only to habitat destruction. A proposed lethal experiment to remove barred owls raised ethical concerns among wildlife agencies, citizens, and advocacy groups. Seeking to better understand these concerns, the Service created the Barred Owl Stakeholder Group. Using an innovative method and instrument in the form of an ethics-based policy dialogue and an ethics brief, the stakeholder group explored the ethical dimensions of the removal experiment. This process holds lessons for how public policy can bring ethics to bear on wild lives.

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WASSER, SAMUEL K., and KATHLEEN E. HUNT. "Noninvasive Measures of Reproductive Function and Disturbance in the Barred Owl, Great Horned Owl, and Northern Spotted Owl." Annals of the New York Academy of Sciences 1046, no. 1 (June 2005): 109–37. http://dx.doi.org/10.1196/annals.1343.010.

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Holt, Denver W., and Colleen Bitter. "BARRED OWL WINTER DIET AND PELLET DIMENSIONS IN WESTERN MONTANA." Northwestern Naturalist 88, no. 1 (March 2007): 7–11. http://dx.doi.org/10.1898/1051-1733(2007)88[7:bowdap]2.0.co;2.

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Holm, Samantha R., Barry R. Noon, J. David Wiens, and William J. Ripple. "Potential trophic cascades triggered by the barred owl range expansion." Wildlife Society Bulletin 40, no. 4 (November 27, 2016): 615–24. http://dx.doi.org/10.1002/wsb.714.

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Diller, Lowell V., Keith A. Hamm, Desiree A. Early, David W. Lamphear, Katie M. Dugger, Charles B. Yackulic, Carl J. Schwarz, Peter C. Carlson, and Trent L. McDonald. "Demographic response of northern spotted owls to barred owl removal." Journal of Wildlife Management 80, no. 4 (February 17, 2016): 691–707. http://dx.doi.org/10.1002/jwmg.1046.

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Peterson, A. Townsend, and C. Richard Robins. "Using Ecological-Niche Modeling to Predict Barred Owl Invasions with Implications for Spotted Owl Conservation." Conservation Biology 17, no. 4 (August 2003): 1161–65. http://dx.doi.org/10.1046/j.1523-1739.2003.02206.x.

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Kelly, Elizabeth G., and Eric D. Forsman. "Recent Records of Hybridization Between Barred Owls (Strix Varia) and Northern Spotted Owls (S. Occidentalis Caurina)." Auk 121, no. 3 (July 1, 2004): 806–10. http://dx.doi.org/10.1093/auk/121.3.806.

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Abstract We summarized records of hybridization between Barred Owls (Strix varia) and Northern Spotted Owls (S. occidentalis caurina) in Washington and Oregon through 1999. A total of 47 hybrids were observed, including 17 F1s that were first detected as adults, 4 F1s that were banded as juveniles and subsequently recaptured as adults, 10 F1 juveniles, and 16 F2 juveniles. All confirmed cases of hybridization between Barred and Spotted owls involved male Spotted Owls paired with female Barred Owls. Ten F1 hybrids that backcrossed with Barred Owls produced a total of 15 young; 6 F1 hybrids that backcrossed with Spotted Owls produced only 1 young. Those differences may indicate that some combinations of sex and species are more compatible or more fertile than others, but more documentation is needed. Because F2 hybrids and subsequent generations are difficult to distinguish in the field from Barred or Spotted owls, genetic comparisons of blood or tissue samples may be needed to identify hybrids beyond the first generation. The small number of F1 hybrids detected during many years of extensive banding studies of Spotted Owls suggests that the isolating mechanisms that separate Barred and Spotted owls are normally sufficient to avoid hybridization between them. Direct competition between the two species for food and space is probably a much more serious threat to the Spotted Owl than hybridization.

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Orfinger, Alexander B., Debbie Helsel, and Shawnlei F. Breeding. "Longevity of the Barred Owl (Strix varia Barton, 1799) from captivity." Wilson Journal of Ornithology 130, no. 4 (December 1, 2018): 1009. http://dx.doi.org/10.1676/1559-4491.130.4.1009.

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Bond, Monica L., Tonja Y. Chi, Curtis M. Bradley, and Dominick A. DellaSala. "Forest Management, Barred Owls, and Wildfire in Northern Spotted Owl Territories." Forests 13, no. 10 (October 20, 2022): 1730. http://dx.doi.org/10.3390/f13101730.

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The Northern Spotted Owl (Strix occidentalis caurina) (NSO) was listed as federally threatened in 1992 due to widespread logging of its old-growth forest habitat. The NSO recovery plan in 2011 elevated competition with Barred Owls (Strix varia) (BO) and wildfires as primary NSO threats based partly on the assumption that severely burned forests were no longer NSO nesting and roosting habitat. We quantified amount of logging before and/or after wildfire and opportunistic detections of BOs within two home range scales (0.8 and 2.09 km) at 105 NSO sites that experienced severe wildfire from 2000–2017. Logging affected 87% of severely burned NSO sites, with BO recorded at 22% of burned-and-logged sites. Most (60%) severely burned NSO sites had evidence of logging both before and after fires while only 12% of severely burned sites had no logging or BO detections, indicating rarity of NSO territories subjected to severe fire without the compounding stressors of logging and invasive BOs. We recommend changes to NSO habitat modeling that assume nesting and roosting habitat is no longer viable if severely burned, and to the US Fish and Wildlife Service’s practice of granting incidental take permits for NSOs in logging operations within severely burned owl sites.

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Bodine, Erin N., and Alex Capaldi. "Can culling Barred Owls save a declining Northern Spotted Owl population?" Natural Resource Modeling 30, no. 3 (July 11, 2017): e12131. http://dx.doi.org/10.1111/nrm.12131.

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Brandão, João, Bala Manickam, Uriel Blas-Machado, Eli Cohen, Johanna Mejia-Fava, Stephen Divers, and Jörg Mayer. "Productive thyroid follicular carcinoma in a wild barred owl (Strix varia)." Journal of Veterinary Diagnostic Investigation 24, no. 6 (October 10, 2012): 1145–50. http://dx.doi.org/10.1177/1040638712463562.

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Hahn, K. A., M. P. Jones, M. G. Petersen, and M. M. Patterson. "Clinical and pathological characterization of an osteoma in a barred owl." Avian Pathology 27, no. 3 (June 1998): 306–8. http://dx.doi.org/10.1080/03079459808419341.

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Singleton, Peter H., John F. Lehmkuhl, William L. Gaines, and Scott A. Graham. "Barred Owl Space Use and Habitat Selection in the Eastern Cascades, Washington." Journal of Wildlife Management 74, no. 2 (February 2010): 285–94. http://dx.doi.org/10.2193/2008-548.

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JAMES, STEPHANIE B., BONNIE L. RAPHAEL, and TRACY CLIPPINGER. "Diagnosis and Treatment of Hepatic Lipidosis in a Barred Owl (Strix varia)." Journal of Avian Medicine and Surgery 14, no. 4 (December 2000): 268–72. http://dx.doi.org/10.1647/1082-6742(2000)014[0268:datohl]2.0.co;2.

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Livezey, Kent B. "BARRED OWL HABITAT AND PREY: A REVIEW AND SYNTHESIS OF THE LITERATURE." Journal of Raptor Research 41, no. 3 (September 2007): 177–201. http://dx.doi.org/10.3356/0892-1016(2007)41[177:bohapa]2.0.co;2.

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Jochems, Brian, and Thomas E. Phillips. "Histological and Ultrastructural Studies on the Conjunctiva of the Barred Owl (Strix varia)." PLOS ONE 10, no. 11 (November 12, 2015): e0142783. http://dx.doi.org/10.1371/journal.pone.0142783.

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Odom, Karan J., and Daniel J. Mennill. "A Quantitative Description of the Vocalizations and Vocal Activity of the Barred Owl." Condor 112, no. 3 (August 2010): 549–60. http://dx.doi.org/10.1525/cond.2010.090163.

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Galloway, Terry D., and Robert J. Lamb. "Infestation parameters for chewing lice (Phthiraptera: Amblycera, Ischnocera) infesting owls (Aves: Strigidae, Tytonidae) in Manitoba, Canada." Canadian Entomologist 151, no. 5 (July 31, 2019): 608–20. http://dx.doi.org/10.4039/tce.2019.42.

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AbstractEleven of the 12 species of owls (Aves: Strigidae, Tytonidae) known to occur in Manitoba, Canada, were examined for chewing lice (Phthiraptera: Amblycera, Ischnocera) from 1976 to 2015: barn owl (Tyto alba (Scopoli); Aves: Tytonidae) (n = 2), snowy owl (Bubo scandiacus (Linnaeus); Aves: Strigidae) (n = 77), great horned owl (Bubo virginianus (Gmelin); Aves: Strigidae) (n = 262), great grey owl (Strix nebulosa Förster; Aves: Strigidae) (n = 142), barred owl (Strix varia Barton; Aves: Strigidae) (n = 10), northern hawk owl (Surnia ulula (Linnaeus); Aves: Strigidae) (n = 18), short-eared owl (Asio flammeus (Pontoppidan); Aves: Strigidae) (n = 74), long-eared owl (Asio otus (Linnaeus); Aves: Strigidae) (n = 67), eastern screech owl (Megascops aslo (Linnaeus); Aves: Strigidae) (n = 59), boreal owl (Aegolius funereus (Linnaeus); Aves: Strigidae) (n = 47), and northern saw-whet owl (Aegolius acadicus (Gmelin); Aves: Strigidae) (n = 44), a total of 802 owls. No lice were found infesting barn owl (Tyto alba (Scopoli); Aves: Tytonidae) or eastern screech owl (Megascops asio (Linnaeus); Aves: Strigidae). We collected a total of 113 810 lice of 12 species: Kurodaia Uchida (Phthiraptera: Menoponidae) – three species; and Strigiphilus Mjöberg (Phthiraptera: Philopteridae) – nine species. Overall prevalence of infestation ranged from 10.0% to 88.9%. Mean intensity for total lice ranged from 22.4 to 506.5. Infestation parameters for each louse–host combination are provided; prevalence and mean intensity were not related for louse–host species combinations. Distribution of louse infestations was highly aggregated. In all louse–host combinations but one, either females were more prevalent than males or there was no significant deviation from 50:50. Male Strigiphilus ceblebrachys Denny significantly outnumbered females in snowy owls. There was a tendency for louse species to co-occur on the same host specimen. Where sample sizes for owls were large enough, no seasonal patterns in abundance of lice were detected.

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Hanna, Zachary R., James B. Henderson, Jeffrey D. Wall, Christopher A. Emerling, Jérôme Fuchs, Charles Runckel, David P. Mindell, Rauri C. K. Bowie, Joseph L. DeRisi, and John P. Dumbacher. "Northern Spotted Owl (Strix occidentalis caurina) Genome: Divergence with the Barred Owl (Strix varia) and Characterization of Light-Associated Genes." Genome Biology and Evolution 9, no. 10 (August 23, 2017): 2522–45. http://dx.doi.org/10.1093/gbe/evx158.

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40

James, Paul C. "Barred Owl Home Range and Habitat Selection in the Boreal Forest of Central Saskatchewan." Auk 115, no. 3 (July 1998): 746–54. http://dx.doi.org/10.2307/4089422.

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41

Mikaelian, I., J. P. Dubey, and D. Martineau. "Severe Hepatitis Resulting from Toxoplasmosis in a Barred Owl (Strix varia) from Quebec, Canada." Avian Diseases 41, no. 3 (July 1997): 738. http://dx.doi.org/10.2307/1592169.

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Barrowclough, George F., Jeff G. Groth, Karan J. Odom, and Jonas E. Lai. "Phylogeography of the Barred Owl (Strix varia): Species limits, multiple refugia, and range expansion." Auk 128, no. 4 (October 2011): 696–706. http://dx.doi.org/10.1525/auk.2011.11057.

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43

Lewicki, Krista E., Kathryn P. Huyvaert, Antoinette J. Piaggio, Lowell V. Diller, and Alan B. Franklin. "Effects of barred owl (Strix varia) range expansion on Haemoproteus parasite assemblage dynamics and transmission in barred and northern spotted owls (Strix occidentalis caurina)." Biological Invasions 17, no. 6 (December 20, 2014): 1713–27. http://dx.doi.org/10.1007/s10530-014-0828-5.

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44

Singleton, Peter H. "Forest Structure Within Barred Owl (Strix varia) Home Ranges in the Eastern Cascade Range, Washington." Journal of Raptor Research 49, no. 2 (June 2015): 129–40. http://dx.doi.org/10.3356/rapt-49-02-129-140.1.

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45

Upton, Steve J., Terry W. Campbell, Maure Weigel, and Richard D. McKown. "The Eimeriidae (Apicomplexa) of raptors: review of the literature and description of new species of the genera Caryospora and Eimeria." Canadian Journal of Zoology 68, no. 6 (June 1, 1990): 1256–65. http://dx.doi.org/10.1139/z90-187.

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Abstract:

Four new species of Coccidia (Apicomplexa: Eimeriidae) are reported from North American raptors. Caryospora kansasensis sp.nov., in the feces of Swainson's hawk, Buteo swainsoni, has ovoid oocysts which measure 37.2 × 32.6 (32.8–40.0 × 29.6–36.0) μm. Caryospora lindsayi sp.nov., from the red-tailed hawk, Buteo jamaicensis, has subspherical oocysts measuring 33.7 × 31.6 (31.2–36.0 × 30.4–32.8) μm. Eimeria megabubonis sp.nov. from the feces of the great horned owl, Bubo virginianus, has ovoid oocysts measuring 32.7 × 28.9 (28.8–36.0 × 27.2–32.0) μm. Eimeria varia sp.nov., from the barred owl, Strix varia, measures 33.1 × 30.5 (31.2 × 36.0 × 28.0–32.0) μm. In addition to the above new species, Caryospora arcayae Volcań and Medrano, 1984 is recorded for the first time from North America and is redescribed from a new host, the broad-winged hawk, Buteo platypterus. Oocysts of Caryospora uptoni and Eimeria bubonis, as well as sporocysts of Sarcocystis/Frenkelia spp., were also found. A table is provided listing key features of the known species of Caryospora and Eimeria of raptors.

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Gjeltema, Jenessa L., Laurel A. Degernes, Halley D. Buckanoff, and Denis J. Marcellin-Little. "Evaluation of Goniometry and Electrogoniometry of Carpus and Elbow Joints in the Barred Owl (Strix varia)." Journal of Avian Medicine and Surgery 32, no. 4 (December 1, 2018): 267. http://dx.doi.org/10.1647/2017-311.

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Buckanoff, Halley D., Jenessa L. Gjeltema, Laurel A. Degernes, and Denis J. Marcellin-Little. "Evaluation of Goniometry and Electrogoniometry of Carpus and Elbow Joints in the Barred Owl (Strix varia)." Journal of Avian Medicine and Surgery 32, no. 4 (December 1, 2018): 267. http://dx.doi.org/10.1647/2018-267.

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Gutiérrez, R. J., M. Cody, S. Courtney, and Alan B. Franklin. "The Invasion of Barred Owls and its Potential Effect on the Spotted Owl: a Conservation Conundrum." Biological Invasions 9, no. 2 (June 4, 2006): 181–96. http://dx.doi.org/10.1007/s10530-006-9025-5.

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Wilkins, H. Dawn, and Michael S. Husak. "Effect of Time and Barred Owl Playback on Winter Detection of Woodpeckers in East-Central Mississippi." Southeastern Naturalist 5, no. 3 (September 2006): 555–60. http://dx.doi.org/10.1656/1528-7092(2006)5[555:eotabo]2.0.co;2.

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Yackulic, Charles B., Janice Reid, Raymond Davis, James E. Hines, James D. Nichols, and Eric Forsman. "Neighborhood and habitat effects on vital rates: expansion of the Barred Owl in the Oregon Coast Ranges." Ecology 93, no. 8 (August 3, 2012): 1953–66. http://dx.doi.org/10.1890/11-1709.1.

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Journal articles on the topic 'Barred Owl'

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