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Monitoring is essential to detect the rate and magnitude of the establishment of NIS. In this study, a list of 123 potential marine NIS for Svalbard was drafted and the presence of marine NIS in soft sediment of Kongsfjorden in Svalbard was assessed using molecular metabarcoding techniques. For 37 species, including eight potential Arctic NIS, we generated new 18S and\/or COI barcode sequences to improve the available online reference databases. In total, 299 species were identified in the sediment samples, including seven potential NIS. Three of these potential NIS have not been reported before in Svalbard: the harpacticoid copepod <jats:italic>Euterpina acutifrons<\/jats:italic>, and the ascidians <jats:italic>Botrylloides violaceus<\/jats:italic> and <jats:italic>Molgula manhattensis<\/jats:italic>. Another novel observation for Svalbard was the polychaete <jats:italic>Chone mollis<\/jats:italic>. Additional studies are needed to assess whether the NIS have been established on Svalbard and what their potential impact on the local system may be. Metabarcoding proved to be an effective monitoring tool to detect the presence of new species in Svalbard marine waters. We advise its use to set up a baseline record for the presence of NIS at points of entry, especially harbours. This approach is also valuable for biodiversity monitoring, in particular the detection of small organisms and life stages that are hard to identify using current visual techniques.<\/jats:p>","DOI":"10.1007\/s00300-021-02822-7","type":"journal-article","created":{"date-parts":[[2021,2,25]],"date-time":"2021-02-25T07:03:33Z","timestamp":1614236613000},"page":"653-665","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Early detection of marine non-indigenous species on Svalbard by DNA metabarcoding of sediment"],"prefix":"10.1007","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3674-1735","authenticated-orcid":false,"given":"Martine J.","family":"van den Heuvel-Greve","sequence":"first","affiliation":[]},{"given":"Anneke M.","family":"van den Brink","sequence":"additional","affiliation":[]},{"given":"Sander T.","family":"Glorius","sequence":"additional","affiliation":[]},{"given":"G. 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