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

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

• Adriatic Sea
• Aegean Sea
• Bay of Biscay
• Celtic Sea
• Ionian Sea
• Levantine Sea
• Marine Baltic sea
• Marine Black sea
• Marine North sea
• North Atlantic Ocean
• Western Mediterranean

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/