Effects of recreational activity and livestock grazing on habitat use by breeding birds in Cottonwood Forests along the South Fork Snake River effectsofrecreat48saab Year: 1998 Minimal differences in percent canopy coverage were found among land uses (Fig. 8a), but overall canopy increased significantly with decreasing patch size (Fig. 8b). Of the eight plant species whose canopy reached the overstory [listed in decreasing order of canopy coverage: narrowleaf cottonwood, red-stemmed dogwood, water birch, willow spp., thin-leaved alder, chokecherry, Rocky Mountain juniper, and silverberry] no
Effects of recreational activity and livestock grazing on habitat use by breeding birds in Cottonwood Forests along the South Fork Snake River effectsofrecreat48saab Year: 1998 Minimal differences in percent canopy coverage were found among land uses (Fig. 8a), but overall canopy increased significantly with decreasing patch size (Fig. 8b). Of the eight plant species whose canopy reached the overstory [listed in decreasing order of canopy coverage: narrowleaf cottonwood, red-stemmed dogwood, water birch, willow spp., thin-leaved alder, chokecherry, Rocky Mountain juniper, and silverberry] no individual plant species had a significant canopy increase in small patches or significant changes among land uses. Vegetation characteristics of the ground and shrub layers were significantly correlated with abundance of ground and shrub nesting birds, respectively (Table 8). Significant negative correlations were found between abundance of ground-nesting species and percentage of bare ground, and between ground nesters and percent canopy coverage. Significant positive correlations were found between shrub nesters, shrub cover, and shrub densities. Ground nesters also were positively correlated with shrub densities. No significant correlation was found between percentage of canopy cover and abundance of canopy-nesting birds. Ground- and shrub-nesting species showed significant positive correlations, whereas a significant negative correlation was found between ground and canopy nesters. CJC-' â â¢' 25
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