Data and updating

Access and use

The data and resulting data products (tables, figures and maps) available on the indicator web page can be used freely given that the source is cited. The indicator should be cited as following: 

HELCOM (2018) Trend in arrival of new non-indigenous species. HELCOM core indicator report. Online. [Date Viewed], [Web link].

ISSN 2343-2543



Result: Trends in arrival of new non-indigenous species

Data: Trends in arrival of new non-indigenous species

There is a strong scientific community in the Baltic region studying NIS and a shared database (AquaNIS) compiling information from scientific papers and national studies. The approach has good prospects to give an indication of the success of management measures to minimize the introduction of non-indigenous species. It has harmonized targets in the Baltic Sea.

Data used in the indicator originates from the AquaNIS database, NOBANIS database, scientific publications, and national experts.

Geographical coverage

The indicator covers the entire Baltic Sea: national coastal and offshore waters divided to sub-basins. There are however wide gaps in the spatial coverage of the current biodiversity monitoring especially in the coastal areas. Currently, the monitoring of coastal and estuarine biodiversity is not conducted to reliably show the distribution and abundance of several NIS.

Temporal coverage

The time series data may overemphasize the recent decades and show too steep increase in the rate of introductions due to improved monitoring of NIS.