Temporal variability in numbers of new marine non-indigenous species per functional group, recorded in Europe's Seas

• Hellenic Centre for Marine Research DataBase (dataset URL is not available), Hellenic Centre for Marine Research (HCMR)

The following Alien species data bases have been used for harmonization of data towards the development of the indicator:

• HCMR (off line Data Base),
• EPPO: http://www.eppo.org/INVASIVE_PLANTS/ias_plants.htm,
• NOBANIS: http://www.nobanis.org/,
• REABIC: http://www.reabic.net/,
• ELNAIS: https://services.ath.hcmr.gr/
• AquaNIS: Information system on Aquatic non-Indigenous species: http://www.corpi.ku.lt/databases/index.php/aquanis
• EASIN: http://easin.jrc.ec.europa.eu
• MAMIAS: http://www.mamias.org
• ICES/IMO/IOC WGBOSV and WGITMO reports 2002-2018
• ESENIAS: http://www.esenias.org/