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The EASIN Catalogue is the core of the EASIN. It contains the information needed to efficiently link EASIN to existing databases and retrieve spatial information for Alien Species distribution in Europe. The Catalogue currently includes information on about 14,000 alien taxa.
The EASIN Catalogue was initially based on an inventory of all species reported to be alien in Europe (or part of) by one or more of 43 online information systems: 7 with global coverage, 2 with European coverage, 5 with supranational coverage, 26 with national coverage, and 3 with sub-national coverage.
Alien Species names were extracted for all European countries, considering 28 EU Member States, 4 Candidate countries to the European Union, and 32 other neighboring countries.
To have full coverage of the four seas surrounding Europe, alien marine species reported from the entire Mediterranean Sea were included, i.e. also from North African and Near East Mediterranean countries.
Since the initial compilation, the EASIN Catalogue has been updated, revised and validated through a process which includes several steps to achieve high quality standards, with the engagement of external experts. Most taxonomic groups have been updated and validated by 2015.
In the EASIN Catalogue a unique identification code is assigned to each valid name and it is used to connect it with additional information for each species (e.g. environment, taxonomy, pathways, impact).
A taxonomic tree (kingdom, phylum/division, class, order, and family) is associated with every species in the Catalogue.
Information on pathways of introduction is being included by largely following the framework proposed by Hulme P.E., Bacher S., Kenis M., Klotz S., Kuhn I., et al. 2008. Grasping at the routes of biological invasions: a framework for integrating pathways into policy. Journal of Applied Ecology 45: 403–414, http://dx.doi.org/10.1111/j.1365-2664.2007.01442.x
EASIN will gradually align its pathways categorization to the one proposed by the Convention of the Biological Diversity (CBD 2014. Pathways of introduction of invasive species, their prioritization and management. UNEP/CBD/SBSTTA/18/9/Add.1, Montreal, Canada, 23-28 June 2014, 18 pp.), aiming at achieving synchronization and harmonizing of information on Alien Species pathways.
Species that are recognized to have a high impact (i.e. present in the ‘high-impact’ or ‘worst invasive’ species lists of DAISIE, GISD, NOBANIS, CABI, MedPAN and SEBI-2010) are highlighted.
For species which are alien in some regions of Europe and native in others (e.g. Ponto-Caspian species invading the Baltic and the North Sea through inland canals), the native range is defined (at a country level for terrestrial and freshwater species and at a marine basin level for marine species).