Research Article

Quantifying Effects of Spatial Heterogeneity of Farmlands on Bird Species Richness by Means of Similarity Index Pairwise

Table 6

Different candidate models, ranked according to the AIC values, used to select the best models to relate bird richness to landscape, land-use, and crop types in farmlands of Central Italy.

Variables included in the modelTotal number of variablesScale levelAIC

Alt + slo + pow + shr + for + unc + bad + gra + hed + tre + urb + cul + ofo + whe + alf + hay + sun + cri + sug + cor + gar + oat + bra + let + land-use div25Landscape, land-use, crop type424.53
Alt + slo + pow + shr + for + unc + bad + gra + hed + tre + urb + cul12Landscape, land-use429.73
Alt + pow + shr + unc + bad + gra + hed + urb8Landscape, land-use422.51
Pow + shr + unc + hed4Landscape, land-use 417.31