The different EICAT categories and the relationship between them. Reproduced from IUCN (2020a) IUCN EICAT Categories and Criteria, IUCN (Gland): page 10,, with permission from IUCN.

  Part of: Volery L, Blackburn TM, Bertolino S, Evans T, Genovesi P, Kumschick S, Roy HE, Smith KG, Bacher S (2020) Improving the Environmental Impact Classification for Alien Taxa (EICAT): a summary of revisions to the framework and guidelines. In: Wilson JR, Bacher S, Daehler CC, Groom QJ, Kumschick S, Lockwood JL, Robinson TB, Zengeya TA, Richardson DM. NeoBiota 62: 547-567.