Table 2.
Environmental variables selected for the analysis and variance
| Variable description | Code | Contribution |
|---|---|---|
| Spatial factor: spatial coordinates |
|
|
| longitude * latitude |
XY |
13%** |
|
CT Abiotic factors: meteorology and topography |
|
|
| Precipitation of Driest Month |
MINRAIN |
5%** |
| Precipitation Seasonality (Coefficient of Variation) |
SEASONRAIN |
5%** |
| Lowest number of rainy days in a month |
CMINRD0 |
7%** |
| Highest number of rainy days per month |
CMAXRD0 |
10%** |
| Mean number of rainy days per month |
CMEANRD0 |
5%** |
| Number of months with less 5 rainy days |
CNBML5DAY |
11%** |
| Mean Temperature of Driest Quarter |
BIO_9 |
12%** |
| Precipitation of Warmest Quarter |
RAINWARMQ |
5%** |
| Number of months with mean temp<20°C |
CNBMLESS20 |
6%** |
| Minimum temperature of the warmest month |
MAXMINT |
7%** |
| Maximum temperature of the coldest month |
MINMAXT |
9%** |
| Minimum temperature of the coldest month |
MINMINT |
14%** |
| Annual Mean Temperature |
MEMET |
10%** |
| Mean Diurnal Temperature Range |
DAYRANGET |
12%** |
| Temperature Annual Range (bio5-bio6) |
BIO_7 |
14%** |
| Elevation above sea level (m) |
ALT |
10%** |
| Compound topographic index*100 |
CTI2 |
11%** |
| Slope*100 |
SLOPE3 |
6%** |
|
ND Biotic factors |
|
|
| Mean value in buffer 3 km for annual NDWI from 2003 to 2005 |
men3WIAN |
18%** |
| Mean value in buffer 3 km for annual NDVI from 2003 to 2005 |
men3VIAN |
16%** |
| Range of value in buffer 3 km for annual NDVI from 2003 to 2005 |
ra3VIAN |
5%** |
| Range of value in buffer 3 km for annual NDWI from 2003 to 2005 |
ra3WIAN |
5%** |
| Mean value in buffer 3 km for maximum NDVI from 2003 to 2005 |
men3VIMAX |
14%** |
| Minimum value in buffer 3 km for maximum NDVI from 2003 to 2005 |
min3VIMAX |
17%** |
| Mean value in buffer 3 km for range NDVI from 2003 to 2005 |
men3VIRA |
9%** |
| Minimum value in buffer 3 km for annual NDVI from 2003 to 2005 |
min3VIAN |
17%** |
| Minimum value in buffer 3 km for annual NDWI from 2003 to 2005 |
min3WIAN |
18%** |
| Maximum value in buffer 3 km for annual NDVI from 2003 to 2005 |
max3VIAN |
13%** |
| Maximum value in buffer 3 km for annual NDWI from 2003 to 2005 |
max3WIAN |
16%** |
|
GC Land cover |
|
|
| 1 Forest (40,50,60,70,80,100,110,30) percentage area 3 km buffer (PCA) |
GFPCA1 |
10%** |
| 1 Forested areas (40,50,60,70) (PCA) |
FOREST |
6%** |
| 40 Closed/ open broadleaved/ evergreen/ deciduous forest (100) (PCA) |
GDPCA40 |
6%** |
| 30 Mosaic veg. (grassland/ shrub/ forest) (60%)/ cropland (35%) (PCA) |
MOSAIC |
5%** |
| 130 Closed/ open (broadleaved/ evergreen/ deciduous) shrub (PCA) |
SHRUB |
8%** |
| 5 Irrigated or shrimp farms (11) (PCA) |
SHRIMP |
12%** |
| No. of Patches (NUMP) 1 forest (40,50,60,70,80,100,110,30) |
PATCHFOR |
7%** |
| No. of Patches (NUMP) 1 forest (40,50,60,70) | GCNUmP1 | 7%** |
Significant environmental variables and their contribution to the explanation of variance in the species dataset when used alone.