Estonia and potentially other regions facing similar challenges.
MATERIALS AND METHODS
Study areaEstonia is located in the Baltic region between Latvia, Russia and Finland, in the border between the Boreal and Nemoral zones (Metzger et al., 2005). Despite its relatively small size (45228 km 2 ) Estonia exhibits a high geological, morphological, and climatic diversity (Arold, 2005). Within Estonia, there are ten semi-natural grassland habitats, based on the Annex I Habitats Directive classification (Council Directive, 1992). Semi-natural grasslands in Estonia have exceptionally high levels of biodiversity, in particular wooded meadows (76 species/m 2 ; Kukk 2004, 1997), alvars (63 species/m 2 ; Partel et al., 1999), floodplain meadows (50 species/m 2 ; Truus and Puusild, 2009), and coastal meadows (34 species/m 2 ; Burnside et al., 2007), among the most species rich habitats in Northern Europe (Benstead et al., 1999). Semi-natural grasslands are the result of long term, low-intensity management practices, in the form of grazing and mowing (Paal, 1998). In Estonia, some of these semi-natural habitats have been managed for centuries (Helm et al., 2005), leading to iconic landscapes such as the Laelatu wooded meadow (Sammul et al., 2003). The area of seminatural grasslands in Estonia has decreased since the late 1950s (Kana et al., 2008).