A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands E91D378D-8EC6-4DBF-B397-84BA2CE192E1 Year: 2005 Least Disturbance Gradient Figure 9. (A) Tree diagram showing VIBI scoring thresholds associated with disturbance categories. Least = least disturbed, Moderate = moderately disturbed, Most = most disturbed. (B) Scatterplot of the composite disturbance gradient and VIBI. Symbols represent disturbance categores: ⢠= least disturbed sites, â = moderately disturbed sites, ^= m
A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands E91D378D-8EC6-4DBF-B397-84BA2CE192E1 Year: 2005 Least Disturbance Gradient Figure 9. (A) Tree diagram showing VIBI scoring thresholds associated with disturbance categories. Least = least disturbed, Moderate = moderately disturbed, Most = most disturbed. (B) Scatterplot of the composite disturbance gradient and VIBI. Symbols represent disturbance categores: ⢠= least disturbed sites, â = moderately disturbed sites, ^= most disturbed sites. Colors represent VIBI classes: green = reference condition, blue = moderately impaired, red = severely impaired. Table 7. Species indicative of reference, moderately disturbed, and severely disturbed sites. Indicator value represents the strength of indication (0 = no indication, 100 = perfect indication). P-values were calculated with a Monte Carlo permutation test. Species with indicator values >25 and P < are reported. Indicator P- Scientific Name Common Name Condition Class Value value Agrostis scabra rough bentgrass reference Car ex aquatilis water sedge reference Car ex utriculata beaked sedge reference Galium trifidum threepetal bedstraw reference Juncus ensifolius swordleaf rush reference Salix drummondiana Drummond's willow reference Iris missouriensis Rocky Mountain iris moderately impaired Maianthemum stellatum starry false hly of the valley moderately impaired Mertensia ciliata tall fringed bluebells moderately impaired Muhlenbergia richardsonis mat muhly moderately impaired Potentilla gracilis slender cinquefoil moderately impaired Pyrola asarifolia liverleaf wintergreen moderately impaired Trifolium longipes long stalk clover moderately impaired Car ex nebrascensis Nebraska sedge severely im
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