Indicator: Threat from introduction of new alien animal species
Source: Research Institute for Nature and Forest, VLIZ Alien Species Consortium
This indicator shows the cumulative number of alien species. Alien species are species that do not live in Flanders naturally, but were introduced through human activities. When aliens become invasive, they can displace indigenous species. The number of alien species introductions is proportionate to the risk of problems with invasive species.
The data are only partly based on monitoring.
Several international treaties (Biodiversity convention, Bird Directive, Convention of Bonn, Convention of Bern, African-Eurasian Migratory Water birds Agreement) disapprove of the introduction of alien species. These directives are not yet translated into Flemish policy.
Trends and distance to target
Between 1800 en 2012 about 250 alien species were found in Flanders.
It is expected that the number of biological invasions will continue to rise if policy remains unchanged.
Research Institute for Nature and Forest
Table for reproduction of graph
Biodiversity Indicators, 2013. INDICATOREN: Threat from introduction of new alien animal species. Research Institute for Nature and Forest, Brussels. www.natuurindicatoren.be (updated 30-10-2013).