Table 1.
Mean model outputs from 10 iterations of MaxEnt models to predict habitat suitability in California for four Amblyomma tick species.
| Environmental Predictor Variable | A. americanum | A. maculatum | A. cajennense | A. mixtum | ||||
|---|---|---|---|---|---|---|---|---|
| Percent Contribution |
Permutation Importance |
Percent Contribution |
Permutation Importance |
Percent Contribution |
Permutation Importance |
Percent Contribution |
Permutation Importance |
|
| BIO1 = Annual mean temperature | na | na | na | na | 68.2 | 25.8 | na | na |
| BIO2 = Mean diurnal range (mean of monthly (max temp - min temp)) | 12.8 | 33.3 | na | na | na | na | na | na |
| BIO3 = Isothermality (BIO2/BIO7) (* 100) | na | na | na | na | na | na | na | na |
| BIO4 = Temperature seasonality (standard deviation *100) | na | na | na | na | na | na | na | na |
| BIO5 = Max temperature of warmest month | na | na | na | na | na | na | na | na |
| BIO6 = Min temperature of coldest month | 27.3 | 38.4 | 38.4 | 40.5 | 8.8 | 25.8 | 79.6 | 67.9 |
| BIO7 = Temperature annual range (BIO5 - BIO6) | na | na | na | na | na | na | na | na |
| BIO8 = Mean temperature of wettest quarter | na | na | na | na | na | na | 14.3 | 12.3 |
| BIO9 = Mean temperature of driest quarter | na | na | na | na | na | na | na | na |
| BIO10 = Mean temperature of warmest quarter | na | na | na | na | na | na | na | na |
| BIO11 = Mean temperature of coldest quarter | na | na | na | na | na | na | na | na |
| BIO12 = Annual precipitation | na | na | na | na | na | na | na | na |
| BIO13 = Precipitation of wettest month | na | na | 18.9 | 15.2 | na | na | na | na |
| BIO14 = Precipitation of driest month | 59.9 | 28.3 | na | na | na | na | na | na |
| BIO15 = Precipitation seasonality (coefficient of variation) | na | na | na | na | 12.4 | 21.9 | na | na |
| BIO16 = Precipitation of wettest quarter | na | na | na | na | na | na | na | na |
| BIO17 = Precipitation of driest quarter | na | na | na | na | na | na | na | na |
| BIO18 = Precipitation of warmest quarter | na | na | na | na | na | na | na | na |
| BIO19 = Precipitation of coldest quarter | na | na | na | na | na | na | na | na |
| Elevation | na | na | 30.6 | 29.8 | na | na | 0.7 | 1.0 |
| Slope | na | na | na | na | na | na | 5.3 | 18.8 |
| NDVI average (1985-2000) | na | na | 12.2 | 14.5 | 3.3 | 12.8 | na | na |
| NDVI standard deviation (1985-2000) | na | na | na | na | 7.4 | 13.7 | na | na |
| Average test AUC from 10 iterations (range) |
0.78 (0.69–0.84) |
0.74 (0.66–0.84) |
0.64 (0.55–0.75) |
0.73 (0.56–0.94) |
||||
| Maximum sensitivity at maximum specificity | 0.24 | 0.30 | 0.61 | 0.61 | ||||
NDVI: normalized difference vegetation index, AUC: average area under the curve (of receiver operator characteristics), na: Variable not included in final model due to collinearity with other variables that were considered more biologically important and/or contributed more to the model.