Mechanical + Northeast UT Density (birds/ha) Applied Noticeable density Norvell et al. 2014 thinning cover experimental increase in first mechanical year thinning to treatment, but cover. 2,400-m effect slowing long-line transects trended back to in 4 600-m legs pre-treatment along cardinal reference by year bearings for bird four. surveys. Plowing / NC Central UT Big sagebrush, Bird density Bird census with Relatively high Castrale 1982 chaining cold desert (territories/16 ha) spot-mapping densities on method and chained plots technique indicated chaining did not reduce sagebrush enough to affect the species, or the habitat recovered within 4 years. + Piceance Basin, Mature Bird density Census using the No Brewer’s O’Meara et al. CO spot-mapping Sparrow at 1981 removal woodland method. unchained plot. (chaining) Chaining increased at recent treatment and then decreased through time. Juniper + Southern OR Sagebrush Abundance Survey of all birds Abundance Holmes et al. 2015 removal habitats seen or heard at cut continued to sites. increase annually after conifer removal; benefits may not yet be fully realized as birds continue to recolonize cuts through time.
treatment, Mechanical thinning + Northeast UT cover Density (birds/ha) Applied experimental mechanical thinning to cover. 2,400-m long-line transects in 4 600-m legs along cardinal bearings for bird surveys. Noticeable density increase in first year but effect slowing trended back to pre-treatment reference by year four. Norvell et al. 2014 Plowing / chaining NC Central UT Big sagebrush, cold desert Bird density (territories/16 ha) Bird census with spot-mapping method and technique Relatively high densities on chained plots indicated chaining did not reduce sagebrush enough to affect the species, or the habitat recovered within 4 years. Castrale 1982 removal (chaining) + Piceance Basin, CO Mature woodland Bird density Census using the spot-mapping method. No Brewer’s Sparrow at unchained plot. Chaining increased at recent treatment and then decreased through time. O’Meara et al. 1981 Juniper removal + Southern OR Sagebrush habitats Abundance Survey of all birds seen or heard at cut sites. Abundance continued to increase annually after conifer removal; benefits may not yet be fully realized as birds continue to recolonize cuts through time. Holmes et al. 2015
Sagebrush%20birds%20WAFWA%20draft%2010-27-16.docx