Figure S1. Variation in monthly mean temperature at the five experimental sites.

Figure S2. Reaction norms for fitness parameters across sites shown individually for each native and introduced population.

Table S1. The locations and other attributes of the sampled populations.

Table S2. Results of model selection for the seven fitness traits.

Table S3. Results of model selection including alternative environmental explanatory variables (PCT2 and precipitation) for the seven fitness traits.

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