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. 2022 Feb 7;69(4):295–311. doi: 10.1111/zph.12919

TABLE 1.

Overall listing of variables considered in the study (* variable with VIF>5 and removed because of multicollinearity)

Variable Description Source
Human population size Number of resident human population at district level

Instituto Nacional de Estadística (INE)

https://www.ine.es/

% of crops area The category includes herbaceous crops different from rice

SIOSE (Sistema de Información sobre Ocupación del Suelo de España) downloaded from Instituto Geográfico Nacional (IGN)

https://www.ign.es/web/ign/portal

% of unproductive area The category includes rocky outcrops, nude soil, ground without construction
% of orchards and other farming area The category includes citrus fruit plants, non‐citrus fruit plants, olive grove, vineyard and other woody plants.
% of pasture area* The category includes pasture
% of urban area The category includes buildings (as continuous urban areas), and buildings mixed with parks, pedestrian and urban green areas (as discontinuous urban areas)
% of water surface area The category includes water courses and artificial water surfaces
% of wood area The category includes coniferous trees and leafy trees
% of shrubs and small bush areas The category includes scrubs and small brushes