Table S1. Annual above-ground net primary productivity by functional group and species for the 4 years of the experiment.

Table S2.F-ratios and P-values for repeated measure anovas of the dependent variable ANPP>10 cm for each species on the independent variables: treatment (+4 °C warming in 2003); year; and treatment × year (n=2).

Table S3.F-ratios, P-values, and r2-values for simple linear regression analyses of the dependent and independent variables listed in each figure (‘Data source’) for data sets covering all 4 years of the study (2002–2005) that include both (B) treatments – 16 individual data points, only the control (C) treatment – 8 data points.

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