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Table 1 Parameters used to calculate the index of vulnerability (IV)

From: Uses and vulnerability of ligneous species exploited by local population of northern Burkina Faso in their adaptation strategies to changing environments

Parameters 1 (Low scale) 2 (Average scale) 3 (Strong scale)
Use frequency (N1) N1 < 20% 20% ≤ N1 < 60% N1 ≥ 60%
Number of uses (N2) N2 < 2 2 ≤ N2 ≤ 4 N2 ≥ 5
Plant parts used (N3) Leaves, latex Fruit, branches Wood, seeds, bark, root, flower
Number of plant parts (N4) N4 = 1 N4 = 2 N4 ≥ 3
Collection mode (N5) Collection on the ground   Collection on the tree, cutting
Development stage (N6) Old, senescent Adult Young
Relative frequency (N7) Fr ≥ 2/3 Fm 1/3 Fm ≤ Fr < 2/3 Fm Fr < 1/3 Fm
  1. Fr relative frequency, Fm maximum frequency