Appendix S1 Planned contrast weight matrix used to test the a priori hypotheses comparing each evolution treatment to its corresponding no-evolution expectation that matched the initial clonal frequency.

Appendix S2 Differences in growth rate between pure clone populations.

Appendix S3 Arthropod taxa observed on the uncaged treatments during the experiment.

Appendix S4 Summary of Pearson correlation analyses between final plant dry above ground biomass and three fitness traits.

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