Table 1 Predictors and variable importance scores in seasonal distribution models of the Western Arctic Herd
From: Using seasonal landscape models to predict space use and migratory patterns of an arctic ungulate
Included 2010 Predictors (units) | Source | Spring | Calving | Insect Relief | Late Summer | Fall | Winter |
|---|---|---|---|---|---|---|---|
Active Layer Thickness*∆ (m) | 31.0 | 15.1 | 16.6 | 15.6 | 31.4 | 18.4 | |
Aspect (°) | 27.6 | 13.5 | 11.3 | 15.2 | 24.6 | 10.6 | |
Coast Distance (m) | 43.3 | 23.6 | 18.3 | 24.0 | 42.9 | 34.8 | |
Elevation (m) | 30.6 | 13.2 | 14.3 | 15.7 | 32.3 | 16.1 | |
Freeze Date*∆ (Julian date) | 9.7 | 4.2 | 3.1 | 5.3 | 17.9 | 7.3 | |
Thaw Date*∆ (Julian date) | 17.2 | 5.5 | 5.1 | 4.1 | 12.3 | 8.5 | |
Fire History∆ (year) | 14.6 | 3.8 | 2.5 | 3.2 | 14.1 | 15.9 | |
Lake Distance (m) | 31.5 | 15.3 | 11.6 | 17.6 | 29.4 | 15.5 | |
Growing Season Length*∆ (days) | 32.8 | 9.6 | 6.2 | 10.0 | 51.2 | 16.0 | |
Ground Temperature*∆ (°C) | 36.6 | 14.8 | 11.7 | 15.0 | 64.6 | 21.3 | |
NDVI Greenup Rate∆ (−0.2˗˗1.0) | 25.6 | 13.7 | 11.7 | 16.1 | 24.8 | 10.7 | |
Max NDVI∆ (−0.2˗˗1.0) | 22.2 | 5.4 | 7.9 | 17.9 | 27.5 | 15.6 | |
Potential Evapotranspiration*∆ (mm/yr) | 69.0 | 100.0 | 100.0 | 28.1 | 100.0 | 35.5 | |
Permafrost Probability (%) | [91] | 18.9 | 10.6 | 10.2 | 16.0 | 32.9 | 18.1 |
Winter Precipitation*∆ (mm) | 100.0 | 13.0 | 8.0 | 57.6 | 47.1 | 25.3 | |
Summer Precipitation*∆ (mm) | 26.7 | 12.7 | 14.2 | 21.4 | 34.0 | 26.9 | |
Spring Precipitation*∆ (mm) | 31.5 | 25.4 | 6.7 | 15.8 | 27.8 | 19.1 | |
Fall Precipitation*∆ (mm) | 35.7 | 12.5 | 35.5 | 20.1 | 44.4 | 21.1 | |
Stream Distance (m) | 30.1 | 13.9 | 10.8 | 15.8 | 26.8 | 13.9 | |
Road Distance (m) | 60.9 | 31.1 | 26.5 | 27.9 | 44.3 | 39.1 | |
Max (Mar) Sea Ice Distance*∆ (m) | [92] | 53.4 | 18.7 | 12.9 | 17.1 | 41.8 | 30.9 |
Min (Sep.) Sea Ice Distance*∆ (m) | [92] | 58.3 | 47.5 | 16.4 | 21.9 | 43.2 | 37.4 |
Slope (⎕) | 28.4 | 13.3 | 12.2 | 17.9 | 34.8 | 13.0 | |
Winter Snow Day Fraction*∆ (%) | 11.6 | 2.8 | 14.1 | 24.7 | 20.6 | 100.0 | |
Summer Snow Day Fraction*∆ (%) | 18.1 | 10.0 | 6.1 | 9.3 | 14.8 | 10.0 | |
Spring Snow Day Fraction*∆ (%) | 25.2 | 7.2 | 7.0 | 9.0 | 16.1 | 13.6 | |
Fall Snow Day Fraction*∆ (%) | 26.6 | 7.0 | 6.9 | 100.0 | 23.7 | 19.9 | |
Snow-free Date*∆ (Julian date) | [62] | 64.2 | 10.4 | 9.3 | 11.7 | 27.7 | 25.8 |
Winter Temperature*∆ (°C) | 25.8 | 17.4 | 9.0 | 15.6 | 29.5 | 28.1 | |
Summer Temperature*∆ (°C) | 28.3 | 15.4 | 7.6 | 10.2 | 28.5 | 12.0 | |
Spring Temperature*∆ (°C) | 22.0 | 12.1 | 9.8 | 10.5 | 24.7 | 12.6 | |
Fall Temperature*∆ (°C) | 65.4 | 20.8 | 9.3 | 13.7 | 26.6 | 21.4 | |
Distance to Trails (m) | 35.7 | 16.1 | 17.0 | 18.9 | 34.2 | 23.6 | |
Terrain Ruggedness 17 × 17 (0–1) | 28.2 | 20.6 | 18.7 | 21.4 | 28.8 | 33.7 | |
Terrain Ruggedness 3 × 3 (0–1) | 26.5 | 13.8 | 12.1 | 16.1 | 24.4 | 10.5 | |
Community Distance (m) | 43.4 | 14.9 | 11.9 | 15.1 | 43.6 | 13.6 | |
Wetland Distance (m) | 25.4 | 13.7 | 11.9 | 15.6 | 30.7 | 13.8 |