. A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands . Wetlands; Plant indicators; Wetland management; Wetlands; Biotic communities; Riparian ecology. Formulas used to compute selected metrics and metric values for the 95* or 5* percentiles are shown in Table 5; Figure 4 (facing pages) displays the discriminatory power and relationships of selected metrics to the composite disturbance gradient. VIBI The VIBI showed a highly significant response to the composite disturbance gradient (VIBI = -
. A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands . Wetlands; Plant indicators; Wetland management; Wetlands; Biotic communities; Riparian ecology. Formulas used to compute selected metrics and metric values for the 95* or 5* percentiles are shown in Table 5; Figure 4 (facing pages) displays the discriminatory power and relationships of selected metrics to the composite disturbance gradient. VIBI The VIBI showed a highly significant response to the composite disturbance gradient (VIBI = - X [disturbance score], F^ ^^ = , R2 = , P = ; Figure 5). However, Table 5. Formulas used to score metrics. Maximum and percentile values are rounded to nearest percent (relative cover metrics), hundredth (seedling density), or tenth (cover-weighted means), q^^^ and q^^^ refer to the 95* and 5^^ percentiles, respectively. Value Metric ctF Maximum 95 percentile 5 percentile Formula relative cover of native graminoids relative cover of exotic species relative cover of annuals/biennials^ willow seedling density (# / m^)*^ cover seedling+young willows'^ cover-weighted FQAI relative cover of hydrophytes cover-weighted mean bank stability rating 55 18 50 9 80 %ngram / 5 (max - % exotic) / (max - ) 0 (max - %ann) / (max - ) sden / %yngSalix / cFQAI / %hydro / bank / ^ values were transformed by logio(%ann -1- 1) prior to scoring ^ values were transformed by logio(sden + ) + 2 prior to scoring ^values were transformed by logio(%yngSalix -1- ) -1- 1 prior to scoring 99 >. Disturbance Gradient Figure 5. Scatterplot showing the relationship between the vegetation index of biotic integrity (VIBI) and a composite human disturbance gradient. Disturbance gradient ranges from 0 (least disturbed) to 1 (most disturbed); VIBI ranges from 100 (highest condition) to 0 (lowest condition). Solid line represent
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