The Environmental Impact Classification for Alien Taxa (EICAT)

EICAT is the IUCN global standard for measuring the severity of environmental impacts caused by alien species. EICAT is a key tool for prioritising alien species that could lead to the most harmful environmental impacts, helping to make the best use of resources to prevent or limit their negative consequences. EICAT classifies alien species into one of eight categories (see figure) according to the severity of their impact on native species and whether the impact is reversible The EICAT Categories and Criteria provide a simple, objective, and transparent classification method. The EICAT Guidelines provide detailed assistance in the application of the categories and criteria.

EICAT can be applied at national, regional, and global levels. All global EICAT assessments are published on IUCN’s Global Invasive Species Database. The EICAT Authority is the governing body coordinating the EICAT assessment process and it is responsible for carrying out the majority of assessments and implementing the review process. The EICAT Authority is composed of experts on specific taxonomic groups or geographic regions.

Visit page

Related content

Global Register of Introduced and Invasive Species (GRIIS)

The Global Register of Invasive Species (GRIS) was developed as a concept and prototype by the IUCN SSC Invasive Species Specialist Group (ISSG) in 2006 as part of a project undertaken for the Defenders of Wildlife on the Regulation of Live Animal Imports into the United States.

The concept was revisited and expanded by the ISSG to address Aichi Biodiversity Target 9 and support its achievement- with the development of the Global Register of Introduced and Invasive Species (GRIIS). GRIIS hosted by the ISSG compiles annotated and verified country-wise inventories of introduced and invasive species. Development and population of the GRIIS was undertaken by the ISSG within the framework of activities of the Information Synthesis and Assessment Working Group of the Global Invasive Alien Species Information Partnership (GIASIP).

Global Invasive Alien Species Information Partnership

Global Invasive Alien Species Information Partnership (GIASI Partnership) supports CBD Parties who are committed to implementing the various decisions under the CBD pertaining to the prevention, eradication, and control of invasive alien species.

IPBES Thematic Assessment Report on Invasive Alien Species and their Control

The IPBES Thematic Assessment of Invasive Alien Species and their Control was adopted in September 2023 and synthesizes information from over 13,000 references on IAS into a comprehensive scientific assessment and a concise summary document for policy makers. The assessment assesses the current status and trends of invasive alien species, their impacts, drivers, management, and policy options to address the challenges they pose. It results from four years of work by experts from 49 countries.

2006

Global invasive species database (GISD)

The Global Invasive Species Database (GISD) is a free, online source of information about alien and invasive species that have a negative impact on biodiversity. The database covers all taxonomic groups from micro-organisms to animals and plants and it aims to increase public awareness and to facilitate effective prevention and management of invasive species by disseminating specialist knowledge and experience to a global audience. The Global Invasive Species Database is managed by the IUCN SSC Invasive Species Specialist Group (ISSG).