Stepwise Red List assessment for habitat types in Germany. The ‘National Long-term Threat’ (nTH) is derived from the ‘Regional Long-term Threats’ (rTH) of eight major landscape regions (Step 1, 2) (see Fig. 3). After that, the degree of endangerment is upgraded or devalued consecutively, first by applying criterion T (Step 3) and then criterion R (Step 4). RLG represents the overall ‘Risk of loss’ (Step 5) (cf. BfN 2017).