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Table 2 Categorical and continuous landscape variables used to determine relative probability of selection for willow ptarmigan

From: Quantifying suitable late summer brood habitats for willow ptarmigan in Norway

Variable

Category

Units

Used sites

Available sites

Vegetation type

Exposed alpine ridges (# 12)

60

460

Bilberry-low fern birch forest (# 6)

366

1481

Wet mires, sedge swamps and reed beds (# 11)

147

633

Fresh heather and dwarf-schub communities (# 17)

4410

11,380

Graminoid apline ridge (# 13)

216

894

Herb-rich meadows (# 18)

572

994

Tall-grown lawn vegetation (# 10)

666

1767

Crowberry birch forest (# 7)

267

959

Lichen-rich birch forest (# 8)

222

929

Lichen-rich heathland (# 15)

145

1063

Heather- and grass-rich early snow patch communities (# 16)

503

1924

Heather-rich alpine ridge (# 14)

2240

6955

Lowland forest (# 1–5)

711

3620

Bryophyte late snow patch vegetation (# 20)

207

1100

Gras and dwarf willow snow-patch vegetation (# 19)

94

742

Ombrotrophic bog and low-grown lawn vegetation (# 9)

1320

3248

Aspect

East

2920

8704

Flat

72

360

North

3246

10,227

South

2991

9589

West

2917

9269

Timberline

Over

6251

18,263

Under

5895

19,886

Elevation

Meters

899 (6 to 1419)

861 (4 to 1501)

Aspect

Degrees

182 (0 to 360)

183 (0 to 360)

Slope

Degrees

5.23 (0 to 46.04)

5.02 (0 to 61.41)

Timberline (deviation)

Meters

2.70 (− 330 to 314)

− 5.20 (− 383 to 495)

  1. Categorical variables are presented with the number of used sites and available sites, respectively. Continuous variables are presented with median and range of the variable for used sites and available sites, respectively. Numbers in parenthesis refers to the original vegetation type number in the vegetation map