Appendix S1. Ant species occurring at the study site in addition to Linepithema humile. Appendix S2. Detailed methodology for mapping ant distribution. Appendix S3. Details of foraging activity data collection methods. Appendix S4. Analysis of covariance models characterizing relationships between rate of spread and rainfall, elevation, and slope. Appendix S5. Analysis of covariance models characterizing the relationships between percent foraging activity and different aspects of the physical environment. Appendix S6. Changes in ant abundances and implications for rates of spread. Appendix S7. Diurnal and seasonal dynamics between temperature and foraging. Appendix S8. Ant spread under the diffusion model.

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