Table 7: Treatment impacts on the Sagebrush Sparrow. "+" = positive response, " - " = negative response, "NC" = no effect or results inconclusive, "+ / - " = mixed response. Treatment Response Location Habitat Response Variable Methods - Wildfire Northwestern Mountain big Density 5-minute point count Respond positively to fire, Great Basin (NV) sagebrush (individuals/km2) surveys across burned and but densities similar to unburned plots unburned after 20 years Wildfire - Northwestern Mosaic of low Bird density 5-minute point-count Occurred at relatively low Great Basin (NV) sagebrush and big (individuals/km2) surveys. density throughout study sagebrush; area, but restricted to mountain big unburned plots. sagebrush at higher elevations. NC Wildfire Central Columbia Abundance (average Point counts in six pre-fire Sagebrush Sparrow was Plateau, individuals per cover types decreasing at a high rate both southeastern WA wheatgrass and point) pre-and post-fire. Cheatgrass grasslands - Wildfire Central OR Mountain big Bird density Compared vegetative Bird communities observed sagebrush (birds/ha/yr) structure and bird across landscape successional communities among 4 impacts surmised from gradient successional states results. Strong preference for shrub-steppe habitats and reduced density in post-burn grassland and juniper. Wildfire - OR, ID, UT, Big sagebrush Bird counts Flushing bird counts Compared burned versus WY, MT unburned sites; substantially more birds on the unburned transects. No birds observed in burned transects. Prescribed NC / + UT, NV, ID, Sagebrush and Bird counts Point transects with Included both prescribed burning woodland distance sampling. burns and adjacent ecotones mechanical juniper removal. Post-treatment density increased at all 3 sites, but only statistically significant at 1 site.
Table 7: Treatment impacts on the Sagebrush Sparrow. "+" = positive response, " - " = negative response, "NC" = no effect or results inconclusive, "+ / - " = mixed response. Treatment Response Location Habitat Response Variable Methods Wildfire - Northwestern Great Basin (NV) Mountain big sagebrush Density (individuals/km2) 5-minute point count surveys across burned and unburned plots Respond positively to fire, but densities similar to unburned after 20 years Wildfire - Northwestern Great Basin (NV) Mosaic of low sagebrush and big sagebrush; mountain big sagebrush at higher elevations. Bird density (individuals/km2) 5-minute point-count surveys. Occurred at relatively low density throughout study area, but restricted to unburned plots. Wildfire NC Central Columbia Plateau, southeastern WA wheatgrass and Cheatgrass grasslands Abundance (average individuals per point) Point counts in six pre-fire cover types Sagebrush Sparrow was decreasing at a high rate both pre-and post-fire. Wildfire - Central OR Mountain big sagebrush successional gradient Bird density (birds/ha/yr) Compared vegetative structure and bird communities among 4 successional states Bird communities observed across landscape impacts surmised from results. Strong preference for shrub-steppe habitats and reduced density in post-burn grassland and juniper. Wildfire - OR, ID, UT, WY, MT Big sagebrush Bird counts Flushing bird counts Compared burned versus unburned sites; substantially more birds on the unburned transects. No birds observed in burned transects. Prescribed burning NC / + UT, NV, ID, Sagebrush and woodland ecotones Bird counts Point transects with distance sampling. Included both prescribed burns and adjacent mechanical juniper removal. Post-treatment density increased at all 3 sites, but only statistically significant at 1 site.