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Fig. 3. Principal response curve diagram resulting from the analysis of the mesofauna data set indicating the effect the sludge application on the mesofauna community. Only Collembola species and taxa which had a relative abundance above 5% were used. Of all variance, 61.7% could be attributed to the sampling date displayed on the horizontal axis and 80.7% of all variance could be attributed to treatment; 45.4% of this variance is displayed on the vertical axis. The lines represent the course of the treatment levels in time. The species or taxa weight can be interpreted as the affinity of the taxon with the principal response curves. Monte Carlo test, *: p 
0.05, **: p 0.01. Orib, Oribatida; Bpar, Brachystomella parvula; Lcya, Lepidocyrtus cyaneus; Imac, Isotomurus maculates; Acar, Acaridida; Parm, Protaphorura armata; Emul, Entomobrya multifasciata; Gama, Gamasida; Vabe, Vertagopus abeloosi; Espp, Entomobrya sp.; Acti, Actinedida; Or5f, Orchesella quinquefaciata; Llan, Lepidocyrtus lanuginosus; Sele, Sminthurinus elegans; Div, Divers; Pnot, Parisotoma notabilis; Equi, Entomobrya quinquelineata; Sfer, Seira ferrarii.
