Skip to main content

Table 2 Variables selected to model the breeding distribution of the House Bunting, grouped by environmental factor

From: Southern Europe is becoming climatically favourable for African birds: anticipating the establishment of a new species

Code

Variable

Units

Source

Topography

   

Alti

Altitude

m

(1)

Slope

Slope

Degrees

(2)

Climate

   

Tmean

Annual mean temperature

°C

(3)

Rtday

Mean diurnal temperature range

°C

(3)

Isot

Isothermally

%

(3)

Season

Temperature seasonality

Standard deviation

(3)

Tmax

Maximum temperature of warmest month

°C

(3)

Tmin

Minimum temperature of coldest month

°C

(3)

Rtan

Temperature annual range

°C

(3)

Twet

Mean temperature of wettest quarter

°C

(3)

Tdry

Mean temperature of driest quarter

°C

(3)

Twarm

Mean temperature of warmest quarter

°C

(3)

Tcold

Mean temperature of coldest quarter

°C

(3)

Prec

Annual precipitation

mm

(3)

Pmax

Precipitation of wettest month

mm

(3)

Pmin

Precipitation of driest month

mm

(3)

Cvp

Precipitation seasonality

Coefficient of variation

(3)

Pwet

Precipitation of wettest quarter

mm

(3)

Pdry

Precipitation of driest quarter

mm

(3)

Pwarm

Precipitation of warmest quarter

mm

(3)

Pcold

Precipitation of coldest quarter

mm

(3)

  1. Data sources: (1) US Geological Survey [75]; (2) calculated from Alti with ArcGIS software; (3) Hijmans et al. [76]