Number and cumulative number of non-indigenous species in Europe's marine subregions, 1970-2020

The combo charts show the number of new introductions of non-indigenous species (NIS) (dots with trendline, primary axis) and the cumulative number of NIS by main species group (stacked columns, secondary axis) reported in Europe’s marine subregions, per 6-year interval between 1970 and 2017.

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Methodology

National inventories of NIS were revised and updated with published data from biodiversity and hot-spot campaigns, academic surveys, and citizen science observed until December 2020 (reported until June 2022). Revised list was validated with the contribution of national experts.
Microalgae and parasite/pathogen species identified are excluded.
Cryptogenic, questionable and range-expanding species identified are also excluded from all analysis.
Native, partly native species identified are excluded at EU level but included in sub-regional assessments for subregions where they have not been identifies as native.

Units

Number of new NIS and cumulative number of new NIS

Additional information

• NIS registered in more than one subregion are recorded in each; subregional assessments thus do not add up to regional or pan-European assessments as these consider each species only once (see Fig 1).
• Circles on the map show the number of new NIS introduced between 1970-2020 by subregion.
• The latest assessment cycle consists of only 3 years (2017-2020).

Number and cumulative number of non-indigenous species in Europe's marine subregions, 1970-2020

Related content

References and footnotes