NC Juniper Counts Mechanical shearing Avian community Sabol 2005 removal of juniper; bird census response to mechanical shearing of juniper in steppe. Results inconclusive for Horned Lark + Juniper Northern AZ Grassland sites Density (birds/ha) Distance sampling. Removal or reduction Rosenstock and removal along a point counts of juniper improves Van Riper III every 250 m along a breeding habitat for 2001 1-km transect. Horned gradient. NC Invasive South Central Sagebrush Bird Count / Walking transects More common in Brandt and species WA Steppe frequency of hopsage / Sandberg’s Rickard 1994 – Cheatgrass interspersed occurrence bluegrass, but did not with disturbed show preference for and invaded cheatgrass sites, patches though they did nest there. + Invasive Central NV Sagebrush Relative bird Two parallel transects Shrub cover most McAdoo et al. species control sites and abundance with 5 circular plots at powerful variable for 1989 – crested crested each site Horned Lark. wheatgrass wheatgrass Negative affinity treatment sites suggests shrub avoidance and preference for openness. + Invasive Eastern ID Big sagebrush Successful nests Visual observation in Increased nesting on Reynolds and species and former 4-ha grid. seeded plots, almost Trost 1980 – crested sagebrush range no nesting in native wheatgrass reseeded with sagebrush plots. crested wheatgrass + Herbicide Southern OR Density Recorded all and Horned Larks Wiens and (individuals/km2) sound observations negatively related to Rotenberry rangeland along 610 m linear forb cover and 1985 strip transects. maximum vegetation Herbicide 2,4-D height. Density treatments. increased substantially
Juniper removal NC Counts Mechanical shearing of juniper; bird census Avian community response to mechanical shearing of juniper in Results inconclusive for Horned Lark Sabol 2005 Juniper removal + Northern AZ Grassland sites along a gradient. Density (birds/ha) Distance sampling. point counts every 250 m along a 1-km transect. Removal or reduction of juniper improves breeding habitat for Horned Rosenstock and Van Riper III 2001 Invasive species – Cheatgrass NC South Central WA Sagebrush Steppe interspersed with disturbed and invaded patches Bird Count / frequency of occurrence Walking transects More common in hopsage / Sandberg’s bluegrass, but did not show preference for cheatgrass sites, though they did nest there. Brandt and Rickard 1994 Invasive species – crested wheatgrass + Central NV Sagebrush control sites and crested wheatgrass treatment sites Relative bird abundance Two parallel transects with 5 circular plots at each site Shrub cover most powerful variable for Horned Lark. Negative affinity suggests shrub avoidance and preference for openness. McAdoo et al. 1989 Invasive species – crested wheatgrass + Eastern ID Big sagebrush and former sagebrush range reseeded with crested wheatgrass Successful nests Visual observation in 4-ha grid. Increased nesting on seeded plots, almost no nesting in native sagebrush plots. Reynolds and Trost 1980 Herbicide + Southern OR rangeland Density (individuals/km2) Recorded all and sound observations along 610 m linear strip transects. Herbicide 2,4-D treatments. Horned Larks negatively related to forb cover and maximum vegetation height. Density increased substantially Wiens and Rotenberry 1985 steppe.
Sagebrush%20birds%20WAFWA%20draft%2010-27-16.docx