Table 3.
Percent contribution and permutation importance of environmental variables to wild bird and mosquito WNV models.
| Wild Bird WNV Model | |||
| Environmental Variable | Code | Percent Contribution (%) | Permutation Importance (%) |
| Altitude | dem | 58.8 | 46.4 |
| Land uses (44 categories) | landcorine | 25.7 | 32.7 |
| Distance from water collections | waterdis | 3.9 | 1.8 |
| Annual mean temperature | clima1 | 3.8 | 2.0 |
| Livestock densities | sheepd | 3.7 | 3.6 |
| May NDVI 1 | mayndvi | 2.2 | 3.3 |
| Human population density | popden | 1.0 | 7.3 |
| April NDVI 1 | aprndvi | 0.8 | 2.4 |
| Mosquito WNV model | |||
| Environmental variable | Code | Percent contribution (%) | Permutation importance (%) |
| Altitude | dem | 31.2 | 98.5 |
| Human population density | popden | 22.9 | 0 |
| Land uses (44 categories) | landcorine | 22.9 | 0.9 |
| Annual mean temperature | clima1 | 15.7 | 0 |
| Maximum temperature of warmest month | clima5 | 3.8 | 0.7 |
| Total annual precipitation (mm) | clima12 | 12.3 | 0 |
| April NDVI 1 | aprndvi | 1.2 | 0 |
1 NDVI: normalized difference vegetation index.