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Table 1 Variables used to describe the capercaillie’s habitat in the Augustów Forest

From: Mature stand developmental stage has ceased to constitute the most suitable habitat for the capercaillie in the Augustów Forest, Poland

Parameter [Acronym] Value (rank or label)
Age of tree stands (years) [ATS] 1–10 (1), 11–30 (2), 31–60 (3), 61–100 (4), > 100 (5)
Tree stand structure [TSS] One-layered (1), Two-layered (2), Multi-layered (3)
Percentage share of Scots pine (%) [PSP] < 20 (1), 20–50 (2), 50–70 (3), 70–90 (4), > 90 (5)
Canopy closure of the upper layer [CCUL] Open (1; 0–30% of ground covered by crowns), Loose (2; 31%–50%), Discontinuous (3; 51%–70%), Moderate (4; 71%–90%), Full (5; > 91%)
Canopy closure of the lower layer [CCLL] Open (1; 0–30% of ground covered by crowns), Loose (2; 31%–50%), Discontinuous (3; 51%–70%), Moderate (4; 71%–90%), Full (5; > 91%)
Percentage cover of shrub layer (%) [PCS] < 10 (1), 10–20 (2), 20–40 (3), 40–60 (4), > 60 (5)
Ground vegetation height (cm) [GVH] < 10 (1), 10–20 (2), 20–30 (3), 30–40 (4), 50–60 (5), 60–70 (7), 70–80 (8), > 80 (9)
Percentage cover of bilberries (%) [PCB] Absence (1), 1–10 (2), 10–20 (3), 20–30 (4), 30–40 (5), > 40 (6)
Soil moisture [SM] Dry (1), Fresh (2), Wet (3), Bog (4)
Soil fertility [SF] Oligotrophic (1), Mesotrophic (2), Eutrophic (3)
Distance from roads (m) [DFR] < 10 (1), 10–50 (2), 50–100 (3), 100–150 (4), > 150 (5)
Presence of habitat elements [PHE] Absence (1), one element present (2), two elements present (3), three elements present (4)
Number of trees with diameter of ≥7 cm(N/ha) [TN] Range from 0 to 16,000 trees per hectare