Filters: Tags: swainson's thrush (X)11 results (39ms)
Introduction : Swainson’s Thrush is a medium sized (15-18cm) thrush which prefers to breed in dense shrub growth associated with spruce-fir forests. The "russet-backed" race prefers mixed forests and deciduous riparian woodlands of the coastal region from British Columbia, to northern California. These Pacific populations winter in mature tropical and secondary forests of Central America, whereas the "olive-backed" race that breeds in the Boreal and Rockies winters in S. America. Models of Monitoring Avian Productivity and Survival (MAPS) demographic data and high-resolution land cover data showed that Swainson’s Thrush prefers large intact forest patches with low perimeter to area ratios. On a regional...
Breeding season detections from all Ebird reocrds
Winter wing length from MoSI data
Breeding Bird Survey Relative Abundance for Swainson's Thrush
10km grid of mean adult wing length
( "pnr_lat_grid" * 0.08576) + (0.01474 * "nlcd01cc10k") - (0.02902 * "nlcd06af90pr") - (0.45815 *"gtopo30_ln). Trimmed with 990m-resolution masks representing the forest layer (NLCD 2006) and excluding cells in which agriculture covers greater than 33% of area. Range of adults allowed was 0-55 representing 95% confidence limits of input data.