Appendix 1:Intercept, slope, r2 and P values of regression equations for the relationship between the explanatory variable, elevation, and four response variables, leaf δ15N, leaf δ13C, soil N and soil C, for each of three target species, either near (P) or away from (A) a legume.

Response Variable / Species / Legume presence / Intercept / Slope / r2 / P
Leaf δ15N (‰) / Potentilla acaulis / P / 26.57 / -0.0156 / 0.24 / 0.0042
A / 57.7 / -0.0333 / 0.56 / <0.0001
Potentilla sericea / P / 1.08 / -0.0011 / 0.09 / ns
A / 36.3 / -0.0206 / 0.35 / 0.0001
Festuca lenensis / P / 13.3 / -0.0083 / 0.58 / ns
A / 29.8 / -0.0172 / 0.40 / 0.0004
Soil δ13C (‰) / Potentilla acaulis / P / -23.5 / -0.0024 / 0.11 / ns
A / -42.0 / 0.0084 / 0.18 / 0.0017
Potentilla sericea / P / -35.3 / 0.0052 / 0.03 / ns
A / -33.1 / 0.0036 / 0.04 / 0.052
Festuca lenensis / P / -30.9 / 0.0022 / 0.06 / ns
A / -42.6 / 0.0090 / 0.28 / <0.0001
Soil N (%) / Potentilla acaulis / P / -1.1 / 0.0016 / 0.17 / ns
A / -8.8 / 0.0060 / 0.60 / <0.0001
Potentilla sericea / P / 3.9 / -0.0014 / 0.54 / ns
A / 10.6 / -0.0052 / 0.44 / ns
Festuca lenensis / P / 2.9 / -0.0008 / 0.05 / ns
A / 6.5 / -0.0029 / 0.24 / 0.0015
Soil C (%) / Potentilla acaulis / P / 49.4 / -0.0033 / 0.65 / ns
A / -98.8 / 0.0813 / 0.33 / <0.0001
Potentilla sericea / P / 43.1 / -0.0006 / 0.33 / ns
A / 39.8 / 0.0019 / 0.49 / ns
Festuca lenensis / P / 22.6 / 0.0103 / 0.13 / ns
A / 126.9 / -0.0501 / 0.59 / <0.0001