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California and Mexican spotted owls may select northern slopes and/or avoid southern slopes. In the central Sierra Nevada,[link widoczny dla zalogowanych] roost sites, but not nest sites, faced north (x=16° north) significantly (P<0.05) more often than a uniform distribution [52]. One of the many factors associated with higher reproductive rates in oak woodland of the southern Sierra Nevada was nesting on north-facing slopes [20]. Although likely confounded with vegetation characteristics, California spotted owl nests did not occur on sites with southern aspects in foothill riparian and oak woodlands in the southern Sierra Nevada [21]. However, the average aspects of nesting and roosting sites in the San Bernardino Mountains were not significantly different than average aspects of random sites.[45] In southern Arizona, 7 out of 10 of Mexican spotted owl nest/roost sites were on northwest facing slopes [50]. In Saguaro National Park most roost sites occurred on northwest facing slopes [26]. Nearly 50% of Mexican spotted owl nests occurred on north or northeast aspects in Arizona and New Mexico study sites [27]. [link widoczny dla zalogowanych] Spotted owls often occur on steep slopes, and sometimes steep slopes are selected more than would be expected based on their availability. For example, in coniferous forests of the western Cascade Range in Washington, slopes at northern spotted owl sites averaged 54.1%, significantly (P<0.001) steeper than the 46.2% average slope on random sites [48]. In mixed evergreen and mixed-conifer forests of northwestern California, gentle (15-30%) slopes were avoided (P<0.03) for roosting [47]. Slope averaged 49% at roost sites in southwest Oregon [10] and 58% at nest sites in low- to mid-elevation coniferous forests of northwestern California [18], but these slopes were typical of the area. In mixed-evergreen and mixed-conifer forests of northwestern California, steep slopes were used by nesting northern spotted owls in proportion with availability [47]. California spotted owl nesting and roosting sites were significantly (P<0.001) steeper than random sites in the San Bernardino Mountains [45]. Slopes of nest sites in foothill riparian and oak woodlands of the southern Sierra
California and Mexican spotted owls may select northern slopes and/or avoid southern slopes. In the central Sierra Nevada, roost sites,[link widoczny dla zalogowanych], but not nest sites, faced north (x=16° north) significantly (P<0.05) more often than a uniform distribution [52]. One of the many factors associated with higher reproductive rates in oak woodland of the southern Sierra Nevada was nesting on north-facing slopes [20]. Although likely confounded with vegetation characteristics, California spotted owl nests did not occur on sites with southern aspects in foothill riparian and oak woodlands in the southern Sierra Nevada [21]. However, the average aspects of nesting and roosting sites in the San Bernardino Mountains were not significantly different than average aspects of random sites.[45] In southern Arizona, 7 out of 10 of Mexican spotted owl nest/roost sites were on northwest facing slopes [50]. In Saguaro National Park most roost sites occurred on northwest facing slopes [26]. Nearly 50% of Mexican spotted owl nests occurred on north or northeast aspects in Arizona and New Mexico study sites [27]. Spotted owls often occur on steep slopes, and sometimes steep slopes are selected more than would be expected based on their availability. For example, in coniferous forests of the western Cascade Range in Washington, slopes at northern spotted owl sites averaged 54.1%, significantly (P<0.001) steeper than the 46.2% average slope on random sites [48]. In mixed evergreen and mixed-conifer forests of northwestern California, gentle (15-30%) slopes were avoided (P<0.03) for roosting [47]. [link widoczny dla zalogowanych] Slope averaged 49% at roost sites in southwest Oregon [10] and 58% at nest sites in low- to mid-elevation coniferous forests of northwestern California [18], but these slopes were typical of the area. In mixed-evergreen and mixed-conifer forests of northwestern California, steep slopes were used by nesting northern spotted owls in proportion with availability [47]. California spotted owl nesting and roosting sites were significantly (P<0.001) steeper than random sites in the San Bernardino Mountains [45]. Slopes of nest sites in foothill riparian and oak woodlands of the southern Sierra