Table 3 Site level bivariate regressions
Variables | Descriptive Statistics | Coefficient (Std. Error) in Regressions | |||
|---|---|---|---|---|---|
Mean | Range | Site mean nymph abundance | Site mean adult abundance | ||
Landscape composition variables | |||||
Proportion of broad-leaved forest (%) | ra = 500 m | 24.98 | 0–94.95 | 2.84 (0.99)** | 1.67 (0.82)* |
r = 1000 m | 21.66 | 0.88–80.30 | 4.14 (1.13)*** | 2.75 (0.93)** | |
r = 1500 m | 21.27 | 1.06–85.32 | 4.61 (1.14)*** | 3.62 (0.91)*** | |
Proportion of coniferous forest (%) | r = 500 m | 2.13 | 0–29.18 | 5.89 (5.01) | 3.67 (4.03) |
r = 1000 m | 3.92 | 0–86.68 | 1.13 (1.97) | 0.63 (1.60) | |
r = 1500 m | 2.50 | 0–25.16 | 14.61 (5.52)** | 10.25 (4.42)* | |
Proportion of crops and pastures (%) | r = 500 m | 35.25 | 0–89.34 | −0.37 (1.00) | −0.10 (0.82) |
r = 1000 m | 35.72 | 0.11–77.07 | −0.31 (1.25) | −0.03 (1.02) | |
r = 1500 m | 40.10 | 6.70–83.70 | −0.61 (1.36) | −0.90 (1.10) | |
Proportion of heathland (%) | r = 500 m | 0.11 | 0–1.11 | 1.78 (102.86) | −16.94 (84.09) |
r = 1000 m | 0.14 | 0–1.19 | −31.32 (109.82) | −23.92 (89.91) | |
r = 1500 m | 0.34 | 0–11.28 | −34.64 (16.62)* | −18.81 (14.88) | |
Landscape (forest) configuration variables | |||||
The number of forest patches | r = 500 m | 11.16 | 0–27.00 | −0.03 (0.04) | 0.002 (0.03) |
r = 1000 m | 51.47 | 6.00–104.00 | 0.001 (0.01) | 0.005 (0.008) | |
r = 1500 m | 124.90 | 12.00–240.00 | 0.001 (0.004) | 0.002 (0.003) | |
Forest edge density (m/ha) | r = 500 m | 21.56 | 0–76.97 | 0.03 (0.01)* | 0.02 (0.01). |
r = 1000 m | 9.83 | 0–48.32 | 0.06 (0.02)*** | 0.06 (0.01)*** | |
r = 1500 m | 14.12 | 0–47.72 | 0.07 (0.02)*** | 0.06 (0.01)*** | |
Area-weighted mean forest shape index | r = 500 m | 2.06 | 0–3.5 | 0.33 (0.37) | 0.42 (0.30) |
r = 1000 m | 2.67 | 1.02–4.25 | 0.66 (0.26)* | 0.79 (0.20)*** | |
r = 1500 m | 3.01 | 1.05–5.13 | 0.72 (0.19)*** | 0.80 (0.14)*** | |
Area-weighted mean forest patch fractal dimension | r = 500 m | 1.11 | 0–1.22 | 0.01 (1.50) | 0.49 (1.24) |
r = 1000 m | 1.15 | 1.02–1.23 | 10.47 (4.32)* | 13.13 (3.45)*** | |
r = 1500 m | 1.16 | 1.03–1.24 | 11.94 (3.77)** | 14.71 (2.99)*** | |
Euclidean mean nearest-neighbour distance between forest patches (m) | r = 500 m | 102.99 | 0–589.62 | −0.02 (0.01)** | −0.005 (0.003). |
r = 1000 m | 89.03 | 63.88–339.93 | −0.04 (0.01)** | −0.08 (0.04)* | |
r = 1500 m | 88.64 | 63.81–195.46 | −0.04 (0.01)*** | −0.03 (0.01)*** | |
Aggregation index of forest patches | r = 500 m | 63.13 | 0–94.25 | 0.02 (0.01) | 0.01 (0.01) |
r = 1000 m | 59.42 | 23.94–89.51 | 0.04 (0.01)** | 0.04 (0.01)*** | |
r = 1500 m | 57.67 | 24.22–90.23 | 0.04 (0.01)*** | 0.05 (0.01)*** | |
Soil variables | |||||
Drainage degree | 2.98 | 0–6 | −0.17 (0.17) | 0.06 (0.14) | |
Proportion of gravel (%) | 3.92 | 0–20.00 | −1.51 (3.08) | −1.40 (2.52) | |
Proportion of sand (%) | 37.35 | 0–90.00 | 1.01 (0.72) | 0.74 (0.59) | |
Proportion of slit (%) | 41.92 | 0–85.00 | −0.25 (0.86) | −0.14 (0.70) | |
Proportion of clay (%) | 10.92 | 0–50.00 | −5.12 (2.45)* | −3.18 (2.05) | |
Wildlife variables | |||||
Categories of shot roe deer number per 1 km² forest | 1.98 | 1.00–5.00 | −0.31 (0.18). | −0.20 (0.15) | |
Number of shot roe deer per 1 km² forest | 12.09 | 0–47.29 | −0.02 (0.01) | −0.01(0.01) | |