Association between the species richness and total cover of the reference physiognomic combination across Natura 2000 habitats. A) Number of reference species present or absent from the target habitat. B) Percentage cover of reference species in the presence or absence of target habitats. Significance codes: p-value < 0.001 ‘***’; p-value < 0.01 ‘**’; p-value < 0.05 ‘*’, p-value < 0.10 ‘˙’.