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    Author(s): James R. Duncan; Amy E. Kearns
    Date: 1997
    Source: In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 138-147.
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (104.41 KB)

    Description

    A Habitat Suitability Index (HSI) model was developed for the Barred Owl (Strix varia) in southeastern Manitoba. An initial validation of the model was performed within three sizes of circular plots (314, 1,256, and 2,827 ha) centered on 28 Barred Owl locations. The model was able to predict suitable habitat at the 314 ha scale. Forest habitat characteristics within the 314 ha plots were described to suggest improvements to the model's performance. The observed values of the three forest resource inventory variables used in the HSI model; cutting class, crown closure, and tree species composition were generally consistent with the model's predictions. The HSI model emphasized the relative importance of white spruce (Picea glauca). This species, while present in the study area, was not detected in the habitat association analysis. A site classification variable not used in the HSI model may have some predictive value. Some of the land units identified as "unproductive areas" may also be important to Barred Owls. Data on the Barred Owl's nesting ecology and actual home ranges are required to further validate the model. Quantifying linkages between Barred Owl habitat and viable population statistics would foster more effective forest management for this species.

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    Citation

    Duncan, James R.; Kearns, Amy E. 1997. Habitat associated with Barred Owl (Strix varia) locations in southeastern Manitoba: a review of a habitat model. In: Duncan, James R.; Johnson, David H.; Nicholls, Thomas H., eds. Biology and conservation of owls of the Northern Hemisphere: 2nd International symposium. Gen. Tech. Rep. NC-190. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 138-147.

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