46 pages. -- Figure S1. Map of the study area. -- Table S1. Project calendar. -- Table S2. List of participants in the horizon scanning per group. -- Table S3. List of removed species. -- Table S4. Arrival scoring criteria. -- Table S5. Establishment scoring criteria. -- Table S6. Impact scoring criteria. -- Table S7. Confidence level scoring criteria. -- Table S8. Illustration of the two components of reliability. -- Table S9. Functional groups and associated abbreviations. -- Table S10. Native geographical region for inland species and associated abbreviations. -- Table S11. Native geographical region for marine species and associated abbreviations. -- Table S12. Classification of potential pathways. -- Table S13. Results of the beta regression model. -- Figure S2. Confidence level shown by experts. -- Table S14. Results of consistency analysis. -- Figure S3. Relationship between Krippendorff’s α and Kendall’s coefficient of concordance (W). -- Table S15. Number of potentially invasive species by thematic group. -- Table S16. List of species with very high risk. -- Table S17. List of species with high risk. -- Table S18. List of species with moderate risk. -- Table S19. List of species with low risk. -- Table S20. Prioritized species of special interest in insular Spanish territories. -- References.

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