Identification, dispersal, and possible mitigation responses for non-indigenous species in the Danish Wadden Sea area

Through monitoring using molecular and conventional techniques, novel data on the distribution and number of non-indigenous species (NIS) are provided for the Danish Wadden Sea area. Review of existing data sources, including the national monitoring program for marine species, enabled a description of changes in NIS occurrences over time, and updated information on the total number of NIS in the region, for which we applied an expert-based judgement to identify high impact NIS. Combining a literature review on introduction pathways for the observed NIS with a model tracer-based assessment of NIS dispersal, helped identify the importance of dif-ferent introduction pathways. This information was finally used to identify the possible and suitable mitigation responses for NIS in the Danish Wad-den Sea.

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