Table 1.
Statistic analysis of environmental variables with small correlation coefficients
| Code | Variables | IEV | Max | Min | Mean | SD | OR |
|---|---|---|---|---|---|---|---|
| Alt (m) | Altitude | – | 4,202 | 1 | 459.36 | 781.42 | 0~300 |
| Bio1 (°) | Annual mean temperature | T | 28.6 | −3.9 | 15.70 | 6.71 | 8.5~16 |
| Bio2 (°) | Mean diurnal range | T | 19.3 | 4.4 | 10.57 | 2.54 | 10.4~13.4 |
| Bio3 | Isothermality (bio2/bio7)(×100) | T | 85 | 20 | 36.72 | 12.12 | 20~36 |
| Bio4 | Temperature seasonality (standard deviation × 100) | T | 15,875 | 239 | 7,059.92 | 3,290.21 | 4,000~5,000 |
| Bio5 (°) | Max temperature of warmest month | T | 41.8 | 13.8 | 30.70 | 4.08 | 27.5~33.5 |
| Bio8 (°) | Mean temperature of wettest quarter | T + P | 30.6 | 1.9 | 22.15 | 6.05 | 25.5~27.5 |
| Bio12 (mm) | Annual precipitation | P | 3,216 | 54 | 1016 | 537.17 | 1,000~1,100 |
| Bio13 (mm) | Precipitation of wettest month | P | 653 | 13 | 198.88 | 112.95 | 100‐200 |
| Bio14 (mm) | Precipitation of driest month | P | 195 | 0 | 25.68 | 29.67 | 0~15 |
| Bio15 | Precipitation seasonality (coefficient of variation) | P | 148 | 7 | 70.23 | 34.40 | 90~100 |
| Bio18 (mm) | Precipitation of warmest quarter | T + P | 1,639 | 5 | 423.96 | 288.65 | 200~500 |
| Bio19 (mm) | Precipitation of coldest quarter | T + P | 796 | 4 | 118.79 | 130.71 | 0~50 |
| Prec1 (mm) | January precipitation | P | 264 | 1 | 41.86 | 49.05 | 0~15 |
| Prec4 (mm) | April precipitation | P | 251 | 2 | 67.05 | 46.0 | 15~45 |
| Prec10 (mm) | October precipitation | P | 385 | 2 | 71.23 | 60.47 | 25~50 |
| Prec11 (mm) | November precipitation | P | 332 | 1 | 52.93 | 56.40 | 20~50 |
| Tmax7 (°) | July maximum temperature | T | 36.9 | 11.9 | 28.61 | 5.34 | 31~32.5 |
IEV is initial environmental variables, Min. is minimum, Max. is maximum, SD is standard deviation, C·V is coefficient of variation, and OR is optimum range. Bioclimatic variables computed from temperatures (T), from precipitation sums (P), or from both (T + P).