Appendix S1 Countries and selection method used for the pressure indicator.

Appendix S2 Databases and reference texts used.

Appendix S3 Designation of alien species as invasive.

Appendix S4 Independent measure of data availability per country.

Appendix S5 The Red List Index.

Appendix S6 Relevant international agreements.

Appendix S7 National policy adoption.

Appendix S8 Trends in the impact of invasive alien species (IAS) by taxon.

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