Grassland butterflies — population index (1990 = 100)
Additional information
For this graph data for grassland butterfly species from nine countries were used: Ukraine (Transcarpathia only) since 1983 (only for Erynnis tages); Pflalz region (Germany) since 1989 (only for Maculinea nausithous); The Netherlands since 1990; Flanders (Belgium) since 1991; Catalunya (Spain) since 1994; Aargau (Switzerland) since 1998; Finland since 1999; Nordrhein Westfalen (Germany) since 2001; Doubs and Dordogne (France) since 2001.
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