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 | Â |
Distance from orchards (including olive groves and wineyards) | Â |
Distance from scrublands | Â |
Distance from fallow fields | Â |
Distance from forests | Â |
Distance from grasslands | Â |
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 600Â m of radius around the nest box |
% of scrublands | Â |
% of fallow fields | Â |
% of urban areas | Â |
% of orchards | Â |
% of forests | Â |
% of grasslands | Â |
Habitat structure (landscape metrics) | |
Shannon diversity | Measure of relative patch diversity in the 600Â m buffer |
Number of patches (NumP) | Total number of patches in the 600Â m buffer |
Mean patch size (MPS) | Average patch size in the 600Â m buffer |
Mean perimeter/area ratio (MPAR) | Shape complexity in the 600Â m buffer |
Edges density (ED) | Amount of edge relative to the landscape area in the 600Â m buffer |