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Appendix A. Constrained redundancy analysis (RDA) biplot of nematode taxa and sites for Holcus lanatus and Lotus corniculatus soils.

FIG. A1. Constrained analysis (RDA) biplot of nematode taxa and countries for (a) Holcus lanatus and (b) Lotus corniculatus soil, focusing on inter-species correlations. In this constrained analysis, only the variation in species abundance related to between-site differences are shown. Only nematode species with 25 % or greater fit (percentage of variance explained by ordination space) are shown. Sites were used as explaining variables. CH, Switzerland; CZ, Czech Republic; UK, United Kingdom. Eigen Values (Ev) for first and second axis are also shown. Nematodes were identified to lowest level of identification, and feeding groups are also presented between brackets: P, plant feeder; B, bacterial feeder; F, fungal feeder; C, carnivore; O, omnivore. A Monte Carlo permutation test (999 permutations) showed that nematode communities differed significantly between countries (Holcus F ratio 1st canonical axis = 3.697, P = 0.001; both axes 3.796, P = 0.001; Lotus F ratio 1st canonical axis = 4.531, P = 0.001; Both axes 4.199, P = 0.001).