. A vegetation index of biotic integrity for small-order streams in southwest Montana and a floristic quality assessment for western Montana wetlands . PFC FAR NF Proper Functioning Condition Category Figure 3. Graphical representation of the relationship between PFC categories and the composite disturbance gradient. Points are disturbance gradient means within PFC categories; error bars are 95% confidence intervals. PFC categories are proper functioning condition (PFC), functioning at risk (FAR), and nonfunctioning (NF); higher disturbance gradient scores reflect greater disturbance. 13

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