Table 1. Variables used in habitat capability indices of focal species, Oregon Coast Range. Maximum is the value or range of the variable at which the index score is set equal to 1. The correlation values represent the rank order correlation between each variable data set and the HCI data set. Rank is assigned by ordering the data from lowest to highest. Details of each model are given in Appendix A for the Pacific Fisher, in Appendix B for the Pileated Woodpecker and in Appendix C for the Warbling Vireo. QMD = quadratic mean diameter, i.e., diameter of the tree with the average basal area, Distance around focal pixel that is evaluated for landscape effects (see Appendices for details).


Species Variables Maximum Correlation with HCI
Pacific Fisher
Number of snags/ha >100 cm dbh 100 0.11
Number of trees/ha >100 cm dbh 100 0.37
Percent of home range in mid or late-seral forest 60 0.98
Pileated Woodpecker
Number of snags/ha 50–75 cm dbh 3.5 0.36
Number of snags/ha >75 cm dbh 1.9 0.56
Percent of home range
with QMD >22.5 cm
75 0.60
Percent of home range
with QMD >15 cm
80 0.53
Number of trees/ha >25 cm dbh 25 0.51
Warbling Vireo
Hardwood canopy closure (%) 70 0.24
Tree species subindex (proportion of hardwood basal area to total basal area) 0.65 0.66
Number of trees/ha >25 cm dbh 124 0.20