| Table 1. Wood-decaying fungal species in fragments of old growth boreal forest. Study site characteristics. Tree volume data are from 1997, whereas time-since-isolation and mean tree age represent the situation in 2017. | |||||||||||
| Site | Coordinates (N, E) a | Area (ha) | Time since isolation (yrs) | All trees | Spruce | ||||||
| Living (m3 ha–1) | Dead (m3 ha–1) | Living (m3 ha–1) | Dead (m3 ha–1) | Coarse b logs (m3 ha–1) | Mean age (yrs) | ||||||
| Puntari | 70904:36165 | 5.9 | 22 | 216 | 43 | 152 | 26 | 11.1 | 178 | ||
| Lauvuskylä | 70891:36265 | 5.5 | 22 | 234 | 53 | 195 | 27 | 7.1 | 168 | ||
| Jonkeri | 70929:36364 | 8.4 | 22 | 197 | 50 | 134 | 34 | 14.6 | 193 | ||
| Vepsä c | 70917:36154 | 7.7 | 22 | 231 | 24 | 118 | 7 | 2 | 133 | ||
| Kujanki | 70869:36179 | 4.9 | 32 | 253 | 42 | 162 | 26 | 9.5 | 181 | ||
| Näveri | 71042:35997 | 4.1 | 35 | 343 | 59 | 177 | 14 | 4.4 | 144 | ||
| Luhtavaara | 71525:36104 | 13.8 | 32 | 245 | 29 | 161 | 10 | 3.9 | 164 | ||
| Pitkävaara | 71622:36171 | 9.6 | 32 | 259 | 40 | 126 | 13 | 4.6 | 159 | ||
| Ypykkävaara | 71584:36228 | 9.2 | 22 | 217 | 25 | 151 | 9 | 4.2 | 168 | ||
| Iso-Matojärvi | 70867:35907 | 4.3 | 35 | 260 | 64 | 162 | 35 | 18.3 | 178 | ||
| Luvesuo | 71640:36213 | 7.5 | 35 | 220 | 47 | 125 | 13 | 4.2 | 164 | ||
| Pellinkangas | 71354:35946 | 3.3 | 35 | 126 | 27 | 70 | 16 | 8.2 | 107 | ||
| Kuivikkovaara | 71256:36541 | 3.6 | 32 | 145 | 50 | 82 | 13 | 7.3 | 224 | ||
| Elimyssalo d | 71293:36674 | 6.4 | >100 | 205 | 46 | 61 | 5 | 1.4 | 144 | ||
| Juortanansalo d | 71678:36359 | 6.2 | >100 | 198 | 14 | 128 | 5 | 1.3 | 155 | ||
| Tuli-Varpusuo d | 71646:36167 | 10.8 | >100 | 145 | 37 | 109 | 19 | 9.8 | 167 | ||
| a Based on Finnish YKJ coordinate system; b Diameter at breast height ≥ 20 cm; c One third of this area was clearcut between 1997 and 2017; d Natural forest fragments surrounded by open peatlands. | |||||||||||
| Table 2. Studied wood-decaying fungal species and their abundance (number of logs occupied) in fragments of old growth boreal forest in 2017. | |||||
| Study species | IUCN-status 2001/2019 a | Ecology b | Mean ± SD | Min/Max | Total |
| Amylocystis lapponica (Romell) Singer | VU/NT | Annual, brown rot | 7.7 ± 8.3 | 0/27 | 123 |
| Fomitopsis rosea (Alb. and Schwein.: Fr.) P. Karst. | NT/NT | Perennial, brown rot | 7.8 ± 9.0 | 0/32 | 124 |
| Phellinus ferrugineofuscus (P. Karst.) Bourdot | NT/LC | Perennial, white rot | 16.3 ± 16.7 | 0/53 | 260 |
| Phellinus viticola (Schwein.: Fr.) Donk | LC/LC | Perennial, white rot | 49.5 ± 35.2 | 7/113 | 792 |
| Leptoporus mollis (Pers.: Fr.) Quél. | LC/LC | Annual, brown rot | 0.8 ± 1.0 | 0/4 | 13 |
| Phlebia centrifuga P. Karst. | VU/LC | Annual, white rot | 1.6 ± 3.3 | 0/12 | 25 |
| Phellinus nigrolimitatus (Romell) Bourdot and Galzin | LC/LC | Perennial, white rot | 1.9 ± 3.0 | 0/12 | 31 |
| Fomitopsis pinicola (Sw.: Fr.) P. Karst. | LC/LC | Perennial, brown rot | 48.6 ± 39.0 | 3/131 | 777 |
| a Rassi et al. (2001) and Hyvärinen et al. (2019); VU = vulnerable, NT = near-threatened, LC = least concern; b Niemelä (2016) | |||||
Fig. 1. Occurrence of wood-decaying fungi in fragments (n = 16) of old growth boreal forest. Changes in the number of occupied fragments between 1997 and 2017. Full author references of fungal taxa are shown in Table 2.
Fig. 2. Abundance of wood-decaying fungi in fragments of old growth boreal forest. Changes in species abundance (number of logs occupied) between 1997 and 2017. Full author references of fungal taxa are shown in Table 2.