Landscape composition and pattern around northern spotted owl nest sites in southwest Oregon

Article Abstract:

It is well-known that northern spotted owls thrive best in areas of old-growth, close-canopied forest. A study of spotted owls in the Klamath Mountains, OR, aimed to discover the nature and composition of the landscape in which they preferred to nest. Landscape characteristics around 20 nest sites were compared with 20 random sites. Analysis of the results shows that the proportional composition of trees in the random and nest sites were not significantly different, although there was more old conifer forest at nest sites. Results suggest that the reproductive rate of spotted owls may be related to the amount of old-conifer forest around the nest site.

Usage, Observations, Habitat (Ecology), Geographic information systems, Animal behavior, Landscape assessment

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Habitat selection by spotted owls during natal dispersal in western Oregon

Article Abstract:

The viability of spotted owl populations may be influenced by successful natal dispersion. Details of a study of spotted owls in western Oregon testing six null propositions concerning the relationship between forest fragmentation, dispersal distance, probability of mortality and habitat selection are presented. The research shows that spotted owls choose closed-canopy forests rather than open-canopy forests during natal dispersal, while dispersal distances fall as young owls disperse through clearcuts. It is suggested that decreasing the use of clearcut logging methods may reduce owl mortality.

Animals, Animal dispersal, Habitat selection

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Old-forest distribution around spotted owl nests in the central Cascade Mountains, Florida

Article Abstract:

Old-forest distribution has been compared around 126 nests of northern spotted owl in the Cascade Mountains, Oregon. Habitat appears to be important when birds select sites, since nests are more likely to be found where there is old forest. There was more old forest on average for the 70 territories where owls were nesting than for the 14 owl sites where there were no nests. Spotted owls have home ranges of and average of 1,769 hectares in these mountains, so the results do not related to the necessary amount of habitatfor owls to breed successfully.

Wildlife management, Cascade Range, Northern spotted owl

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