“…Despite some regional efforts toward a continual monitoring in some of the EU member states (e.g., BISQ in The Netherlands, Schouten et al, 1997;Rutgers et al, 2009; BBSK in Germany, Römbke et al, 1997), reference values by which to measure future biodiversity losses at broader scales are still scarce for most groups of soil fauna (Gardi et al, 2009(Gardi et al, , 2013. Moreover, there is an urgent need to identify and evaluate indicators for soil diversity and ecosystem services (Feld et al, 2009Faber et al, 2013), which can be accomplished by using indicators based on a functional approach, using species traits Pey et al, 2014;Salmon et al, 2014). In fact, species traits may reflect the organismal performances in the environment and their effects on the ecosystem processes underlying important services (Díaz and Cabido, 2001;Violle et al, 2007;de Bello et al, 2010), such as the role of litter comminution supporting nutrient cycling in soils.…”