Figure 1.
Location of the study area with investigated village catchments in Transylvania, Romania.
The small letters indicate the village catchments illustrated for predictions in Figure 4 (a = Cincu, b = Granari, c = Viscri).
Table 1.
Definition of environmental variables used in the study at three different scales and method of obtaining those. Abbreviations are used in Figure 2 and Table 2.
Figure 2.
DCA ordination plot of butterfly species, with significant environmental variables superimposed (p<0.05) (Abbreviations: NoPlant = Local plant species richness; TWI = Local terrain wetness index; rugg_50 ha = context terrain ruggedness; woody_50 ha = context woody vegetation cover; ED_50 ha = context edge density; woody_catch = landscape woody vegetation cover; SIDI = landscape compositional heterogeneity;
Table 1).
Figure 3.
Predicted effect of local heterogeneity on species richness in arable land versus grassland, based on the simplified generalized linear mixed model (Table 2).
Figure 4.
Maps of predicted butterfly distributions in three example villages.
Left: Land cover map according to CORINE 2006; middle: predicted species richness for arable and grassland areas within each village catchment; right: predicted abundance of the Meadow Brown (Maniola jurtina).
Table 2.
Parameter estimates of the species distribution models with significance levels indicated by: †P<0.1; *P<0.005; **P<0.01; ***P<0.001.