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Table 2 Environmental predictors selected and eliminated in model building after correlation analysis. Eliminated predictors are highly correlated variables (Pearson’s |r| > 0.8)

From: Mapping current and potential future distributions of the oak tree (Quercus aegilops) in the Kurdistan Region, Iraq

Selected predictors (code) (units)

Eliminated predictors (code) (units)

Slope (degree)

DEM (m)

Aspect (degree)

Isothermality (Bio2/Bio7) (Bio3) (× 100)

Annual mean temperature (Bio1) (°C)

Max temperature of warmest month (Bio5) (°C)

Mean diurnal range (mean of monthly (max temp-min temp)) (Bio2) (°C)

Min temperature of coldest month (Bio6) (°C)

Temperature seasonality (Bio4) (standard deviation × 100)

Temperature annual range (Bio5-Bio6) (Bio7) (°C)

Annual precipitation (Bio12) (mm)

Mean temperature of wettest quarter (Bio8) (°C)

Precipitation of driest month (Bio14) (mm)

Mean temperature of driest quarter (Bio9) (°C)

Precipitation seasonality (coefficient of variation) (Bio15) (mm)

Mean temperature of warmest quarter (Bio10) (°C)

Soil pH (parts Hydrogen)

Mean temperature of coldest quarter (Bio11) (°C)

Soil carbon (kg-C/m2 to 1 m depth)

Precipitation of wettest month (Bio13) (mm)

 

Precipitation of wettest quarter (Bio16) (mm)

 

Precipitation of driest quarter (Bio17) (mm)

 

Precipitation of warmest quarter (Bio18) (mm)

 

Precipitation of coldest quarter (Bio19) (mm)

 

Soil moisture (mm)