Fig. 2

Results of the MARS models run at the site scale. Graphical representation of the relationship modelled by means of multivariate adaptive regression splines (MARS), linking the occurrence probability of 10 species of conservation interest and to the extent (in ha) of the habitat ‘reedbeds/mires’ in 21 Natura 2000 wetlands of northern Italy. The graphs show the species-specific relationships as resulting from the multi-species model (see Table 1 and text for details). Dotted lines in the lower boxes indicate the position of the threshold value (unique for all the species) identified by MARS procedure. a Marsh Harrier; b Purple Heron; c Ferruginous Duck; d Kingfisher; e Night Heron; f Little Bittern; g Black Kite; h Honey Buzzard; i Lesser-spotted Woodpecker; j Black Woodpecker