Individual vulnerability factors of Silver fir (Abies alba Mill.) to parasitism by two contrasting biotic agents: mistletoe (Viscum album L. ssp. abietis) and bark beetles (Coleoptera: Curculionidae: Scolytinae) during a decline process

Table 7 Comparison of proportions values of tree population (N = 227) and the sub-samples (mistletoe, N = 20; bark beetles, N = 48) between the three classes of (1) defoliation, (2) diameter, (3) slope of past growth since 2003, and (4) the distance from the crest

Classes	Mistletoe	Bark beetles	Whole population
Defoliation
>10%	0.250	0.386	0.319
Intermediate	0.550	0.477	0.538
0%	0.200	0.136	0.144
Diameter
<25.5 cm	0.450	0.333	0.289
Intermediate	0.250	0.267	0.240
>32.0 cm	0.300	0.400	0.471
BAI slope
<−0.004	0.250	0.400	0.321
Intermediate	0.450	0.422	0.454
>0.004	0.300	0.178	0.225
Distance from the crest
<200m	0.400	0.444	0.370
intermediate	0.100	0.244	0.335
>400 m	0.500	0.311	0.295

ISSN: 1297-966X