Figure 3. The Spearman rank correlation between the conservation status of Natura 2000 habitats and the level of invasion by alien plant species.

Good conservation status is expressed by the percentage of locations with favorable structure and functions of a habitat (SFA_FV), inadequate conservation status is expressed by the percentage of locations with unfavorable inadequate structure and functions of a habitat (SFA_U1). On diagrams (A) and (B) relationship between good (A) or inadequate (B) habitat conservation status and the total number of alien species per habitat (S) is presented. Diagrams (C) and (D) show relationship between good (C) or inadequate (D) habitat conservation status and the Shannon index (H). Diagrams (E) and (F) reveal relationship between good (E) or inadequate (F) habitat conservation status and the frequency of occurrence of alien species across all locations in a given habitat type (F).