Table 1.
List of bioclimatic variables used in this study. These variables, created by Fick and Hijmans (2017), were downloaded as 2.5 min (5 km2) resolution environmental layers from worldclim.org. Variables used monthly climate data collected over 30 years between 1970 and 2000. A subset of bioclimatic variables, identified by tick marks, was produced by stepwise regression analysis to be used in the BIOCLIM and MAXENT modelling approaches.
| Variable Code | Variable Title | Unit | Inclusion in Final Model |
|---|---|---|---|
| Bio1 | Annual Mean Temperature | °C | ✓ |
| Bio2 | Mean Diurnal Range (mean of monthly (max temp-min temp)) | °C | ✓ |
| Bio3 | Isothermality ((Bio2/Bio7) × 100) | % | ✓ |
| Bio4 | Temperature Seasonality (standard deviation × 100) | °C | ✓ |
| Bio5 | Max Temperature of Warmest Month | °C | ✓ |
| Bio6 | Min Temperature of Coldest Month | °C | |
| Bio7 | Temperature Annual Range (Bio5-Bio6) | °C | ✓ |
| Bio8 | Mean Temperature of Wettest Quarter | °C | ✓ |
| Bio9 | Mean Temperature of Driest Quarter | °C | ✓ |
| Bio10 | Mean Temperature of Warmest Quarter | °C | ✓ |
| Bio11 | Mean Temperature of Coldest Quarter | °C | ✓ |
| Bio12 | Annual Precipitation | mm | |
| Bio13 | Precipitation of Wettest Month | mm | ✓ |
| Bio14 | Precipitation of Driest Month | mm | ✓ |
| Bio15 | Precipitation Seasonality (coefficient of variation) | % | |
| Bio16 | Precipitation of Wettest Quarter | mm | ✓ |
| Bio17 | Precipitation of Driest Quarter | mm | |
| Bio18 | Precipitation of Warmest Quarter | mm | ✓ |
| Bio19 | Precipitation of Coldest Quarter | mm | ✓ |