Fig. 2.

Effects of altered wolf spider densities and experimental warming on decomposition in the litter layer (A; percent litter mass remaining from the initial amount), percent N remaining in litter (B; in relation to initial N content of litter), and total available soil N (C; milligrams of NH₄⁺ per 10 cm⁻²) over the peak 6-wk summer season. Blue circles are from ambient temperature plots, and red triangles are from the experimentally warmed plots. Points are mean treatment effects, and error bars are SEs. Solid lines in A represent a significant interaction between the treatments, and dotted lines in B indicate a nonsignificant interaction. Full model results are shown in Table 2 and SI Appendix, Tables S3 and S5.