Table 2.
Ecological indicator (response) and disturbance (predictor) variables used in the analysis of the National Wetland Condition Assessment data
| Variable | Code used in Figures and Tables |
|---|---|
| Ecological indicator variables (Response) | |
| Relative percent cover alien plants | %Alien |
| Vegetation multimetric index of condition | VMMI |
| Lead (mg/kg) in surface soil | Soil Pb |
| Total phosphorus (mg/kg) in surface soil | Soil P |
| Total nitrogen (μg/L) in water column | TN |
| Total phosphorus (μg/L) in water column | TP |
| Site-level disturbance variables (Predictor) | |
| Damming disturbance index | Dam |
| Ditching disturbance index | Ditch |
| Filling/Erosion disturbance index | Fill |
| Hardening disturbance index | Harden |
| Vegetation Removal disturbance index | VegRemoval |
| Vegetation Replacement disturbance index | VegReplace |
| Landscape-level disturbance variables (Predictor) | |
| Percent agriculture land use/land cover (LULC) | %Agr |
| Percent developed LULC | %Dev |
| Percent impervious surface | %Imp |
| Percent recreational LULC | %Rec |
| Human population density (number/mi2) | PopDen |
| Road density in buffer (km/km2) | RoadDen |
| Hydrologically modified (canal/ditch) length (km) | HydroMod |