Endangered flora and fauna 
Changes in the populations of the Swiss breeding bird species 
Forest area by ecological quality 
Organically cultivated land 
Definitions/Comments:
Biotope value = ecological measure for the assessment of forests as habitats for flora and fauna, based on three criteria: The forest area’s closeness to the natural state (mixed deciduous forests), shrub biodiversity, structural diversity (e.g. multi-layered forests with trees from different age groups). For the calculation of the biotope value, the “structural variety” criterion counts double.
Sources: Swiss Federal Institute for Forest, Snow and Landscape Research (Swiss national forestry inventory, WSL)
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