Incorporation of mineral nitrogen into the soil food web as affected by plant community composition.

berlesei and marginally significant in L. cyaneus with Δ 15 N values decreasing over time (Figure 3 , Figure 6c , Table 1 ). Δ 15 N values of Ceratophysella sp. significantly varied with plant species richness being high in plots with two and eight species but low in those with four and 16 species (Figure 4 ).

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