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EStatistical analyses were achieved with the R-software (R CoreTeam, 2013). ANOVAs were performed to test for the impact ofearthworm species, soil type and seed species on germination ratesand seedling growth. Seeds that did not germinate were not takeninto account for the analysis of seedling growth. The effect ofmicrocosm replicates from which the initial material was collectedand the effect of trays in which the artificial casts were placedwere tested using random effect in Linear Mixed models (Zuuret al., 2009). They were non significant. Continuous data were log-transformed prior to analysis to improve normality andhomoscedasticity of residuals. Tests on germination rates werebestfitted with a binomial distribution. Tukey-HSD tests (a = 0.05)were performed to compare means of seed germination andseedling growth with the glht function of the multcomp R-package(Hothorn et al., 2008). Correlations were tested between seedgermination and seed growth parameters and chemical propertiesof casts with the cor.test R function. Further details on castphysical and chemical data can be found in Clause et al. (2014).
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