How to use the Global Register of Introduced and Invasive Species (GRIIS)

The Global Register of Introduced and Invasive Species (GRIIS) presents validated and verified inventories of introduced and invasive species at the country level. The annotations recorded in GRIIS include- Species name and authorship, synonyms if used and authorship, Higher taxonomy (kingdom), Environment/system in which the species occurs, provenance or origin of the species, its invasive status in that country and if the there is evidence of impact on biological diversity or natural areas and finally if the presence an biological status is verified. All information sources used to obtain any of the annotations are documented for every species record.

A network of nominated country editors are committed to update and verify and validate species records. All editor details are available.

All information in GRIIS is searchable and downloadable

GRIIS offers two Search options- Basic and Advanced

Basic Search

A query using a genus or species name can be made using the Basic search function.

The search will return any invasive species with a name, or part of a name, that matches your search term, whether it is an accepted scientific name

Advanced Search

Advanced search options are available by country, by kingdom, by environment/system, species whose status and impacts have been verified.

"Impact verified" (yes) refers to the evidence of alien species impact confirmed by peer reviewed literature or reports.

"Status verified", with the options yes/no, refers to a validation by editors that the species is present in the country and its biological status as described.

Classifications/ categories for highlighted terms are provided below


  • Animalia
  • Plantae
  • Fungi
  • Chromista
  • Protozoa
  • Other (in which Bacteria and Viruses are included)

Note: In the table result each kingdom is specifically reported (also Bacteria or Viruses)


Five main Environment /System and combinations of these five descriptors (totaling to 16 Environment/Systems) are documented in GRIIS.

  • Terrestrial
  • Brackish
  • Freshwater
  • Host
  • Marine

The user can query the database only on the five main terms but the query will result in a list of species in which the system is defined following the 16 classification scheme (e.g. freshwater/brackish; terrestrial/freshwater, brackish/marine, terrestrial/brackish/marine etc.).

Note: In the table result, the specific combination of system are reported.


  • Alien
  • Native/Alien (when the species is native in a part of a country and alien in another- some typical examples include species that are native to the continental part of the country and alien and invasive on offshore islands such as the case of Portugal and the Azores and Madiera)
  • Cryptogenic/ uncertain


  • Invasive
  • Not specified
  • Uncertain

The queries result displays a list of one or several species of interest with any of the selected attributes: country of presence, kingdom, environment/ system in which the species occurs, provenance, status, invasiveness, verified impact, verified status, and sources. If present, also different synonyms used by country are reported.


A comprehensive list of sources for each country is available by selecting the Sources tab.

A list of country editors with contact details is available by selecting the Editors tab.