Table 2
Pearson correlation, multiple regression, and random forest results for relating residual regional macroinvertebrate genera richness to regional environmental data composited at the fine-grain ecoregion extent. Variables sorted in order of decreasing correlation strength.
| Variable | Pearson correlation coefficient | Multiple regression coefficient | Random forest % increase in MSE | Random forest node purity |
|---|---|---|---|---|
| % Forested Land Cover | 0.584*** | 0.352** | 16.9 | 12490 |
| % Agricultural Land Cover | –0.387*** | –0.630*** | 17.6 | 9991 |
| Mine Density (#/km2)# | 0.312** | 6.01 | 6594 | |
| Mean Annual Air Temperature (°C) | –0.299** | –2.80*** | 13.6 | 6949 |
| Surface Area (km2)# | –0.244* | 1.40 | 4946 | |
| Mean Precipitation (mm)# | 0.243* | 8.52 | 5580 | |
| % Grass + Shrub Land Cover | –0.217 | – | − | |
| % Historical Glaciation | 0.208 | 7.25 | 2698 | |
| Mean Elevation (m)# | 0.102 | 6.90 | 4431 | |
| % Bare Land Cover | 0.089 | 6.27 | 5003 | |
| % Developed Land Cover | 0.076 | 7.98 | 3621 | |
| Road Density (km/km2)# | 0.044 | 43.9*** | – | − |
| Population Density (#/km2)# | 0.019 | – | − | |
| % Open Water Land Cover | –0.019 | – | − | |
| % Wetland Land Cover | 0.018 | 1.25 | 4052 | |
| Multiple Regression Intercept | 73.9 | |||
| R2 | 0.512 | 0.347 | ||
| Root Mean Square Error | 22.4 | 25.1 | ||
| Sample Size | 74 | 74 | 74 | 74 |
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