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 Table 6. Accuracy assessment of VIBI scoring thresholds with regard to disturbance classes. Predicted disturbance class Actual class Least disturbed Moderately disturbed Most disturbed Actual total Least disturbed Moderately disturbed Most disturbed 8 1 0 0 12 1 0 2 6 8 15 7 Predicted total 9 13 8 30 Overall accuracy 87 VIBI scores could reliably only differentiate three condition classes (F^ ^^ =
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 Table 6. Accuracy assessment of VIBI scoring thresholds with regard to disturbance classes. Predicted disturbance class Actual class Least disturbed Moderately disturbed Most disturbed Actual total Least disturbed Moderately disturbed Most disturbed 8 1 0 0 12 1 0 2 6 8 15 7 Predicted total 9 13 8 30 Overall accuracy 87 VIBI scores could reliably only differentiate three condition classes (F^ ^^ = , P = , all pairwise comparisons significant at the level after Bonferroni correction). Overall, the VIBI was relatively robust in its ability to differentiate between these classes (Table 6). While analyses of variance of the four- and five-category partitions of the composite disturbance gradient were significant, VIBI means were not strongly differentiated among all disturbance categories. Sites with VIBI scores above 70 were considered to be reference condition (Figure 6), sites with scores from 48 to 70 were considered to be moderately impaired (Figure 7), and sites with scores below 48 were considered to be severely impaired (Figure 8). Figure 9 graphically displays VIBI scoring thresholds, condition classes, and misclassified cases. Species indicative of each condition class are shown in Table 7. Figure 7. Moderately impaired site; channel shows evidence of past incisement but is stable.
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