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Table 1 Predictor variables used to model the occupancy and the productivity of European Rollers in artificial nest boxes in Lazio region, Central Italy

From: Nest box selection and reproduction of European Rollers in Central Italy: a 7-year study

Habitat variables

Definitions

Nest position

Distance from arable fields (including cereals)

Euclidean distances between the nest box and the nearest patch of the given habitat type

Distance from urban areas

 

Distance from orchards (including olive groves and wineyards)

 

Distance from scrublands

 

Distance from fallow fields

 

Distance from forests

 

Distance from grasslands

 

Terrain

Altitude

Meters above sea level

Solar radiation

Amount of solar radiation, expressed in Wh/m2

Habitat composition

% of arable fields

Percentage of each habitat variable in a circular buffer of 600 m of radius around the nest box

% of scrublands

 

% of fallow fields

 

% of urban areas

 

% of orchards

 

% of forests

 

% of grasslands

 

Habitat structure (landscape metrics)

Shannon diversity

Measure of relative patch diversity in the 600 m buffer

Number of patches (NumP)

Total number of patches in the 600 m buffer

Mean patch size (MPS)

Average patch size in the 600 m buffer

Mean perimeter/area ratio (MPAR)

Shape complexity in the 600 m buffer

Edges density (ED)

Amount of edge relative to the landscape area in the 600 m buffer