Example: Target 6. Reduce the Introduction of Invasive Alien Species by 50% and Minimize Their Impact
Headline indicator: Rate of invasive alien species establishment
The GBF contains the commitment to prevent and manage established invasive alien species and decrease the rates of introduction and establishment of other known or potential invasive alien species by at least 50% by 2030. Invasive alien species (IAS) are animals, plants, pathogens, and other organisms that are non-native to an ecosystem, spreading to new areas with human intervention, which may cause environmental harm or negatively affect human health. They can have significant negative impacts on the economy. Between 1960 and 2021, the total cost of invasive species was EUR 7.94 billion in Nordic countries (likely an underestimation): Norway (EUR 3.07 billion), Denmark (EUR 2.09 billion), Sweden (EUR 1.38 billion), Finland (EUR 1.06 billion), and Iceland (EUR 24.20 million) (Kouratidou et al., 2022).
As of 2024, Finland had 29 harmful IAS, eight species groups, and two hybrid species on the national list. Fifteen of these are plants, four mammals, eight amphibians, two molluscs, and one hybrid bird. In addition to the GBF target, EU countries will be responsible for ensuring that the number of endangered and near-threatened species threatened by IAS decreases by 50%. This means that IAS in the next Finland Red List should threaten only a maximum of 31 endangered and near-threatened species (reduced from 63 species in 2019) (Hyvärinen et al., 2019). Finland will publish the next Red List of threatened species in 2029.
In Finland, the most harmful invasive alien plant species to Red-Listed species are garden lupin (Lupinus polyphyllus), and Japanese rose (Rosa rugosa) (Lakka et al., 2023). It is estimated that 72 and 48 Red List species are threatened by garden lupin and Japanese rose respectively (Jauni et al., 2023). The most harmful invasive alien mammals to Red listed species are the American mink (Neogale vison) and the raccoon dog (Nyctereutes procyonoides).
In order to reach both the GBF and EU targets, prioritization of certain areas and species will be crucial. Wherever possible, the immediate removal of IAS plant populations in areas of rapid dispersal (e.g., close to ditches, rivers, inland waters, and the Baltic Sea) is highly recommended. Since chemical removal of IAS adversely affects native fauna, mechanical removal techniques are best. Furthermore, Finland's management actions should prioritize halting the establishment of any IAS in biologically valuable areas, particularly in Lapland, where no IAS have been observed and native fauna has not yet been disturbed.
Finland has made progress in addressing invasive alien species under Target 6 of the GBF, but challenges remain. Although strategies and advisory bodies are in place, ongoing efforts and resources are needed to manage and reduce their impact effectively.