A baseline study of the occurrence of non-indigenous species in Danish harbours
Andersen, Jesper Harbo; Kallenbach, Emilie; Kjeldgaard, Mathias Brink; Knudsen, Steen Wilhelm; Eikrem, Wenche; Fagerli, Camilla With; Oug, Eivind; Dale, Trine; Thaulow, Jens; Gitmark, Janne Kim; Hobæk, Anders; Green, Norman Whitaker; Hesselsøe, Martin; Støttrup, Josianne; Kuhn, Jesper; Bekkevold, Dorte; Jacobsen, Lars Magnus Wulf; Møller, Peter Rask; Olesen, Christian Aakjær; Carl, Henrik; Stuer-Lauridsen, Frank
MetadataShow full item record
We report the first ever nation-wide study of the occurrence of non-indigenous species in Danish harbours. The sampling was car-ried out using both conventional and biomolecular methods (eDNA). In total, 16 harbours were covered – Esbjerg and Aarhus, the two largest harbours in Denmark, with intensive sampling and 14 harbours with a reduced programme. 26 non-indigenous species were recorded using conventional sampling and 13 species were recorded using eDNA-based methods. Excluding overlapping rec-ords, we have recorded a total of 34 non-indigenous species in the 16 harbours studied. Based on the results, we conclude the following: 1) more non-indigenous species are found in the western parts of Denmark (North Sea region) then in the eastern parts (Baltic Sea), and 2) a few species previously unseen in Danish marine waters were recorded, i.e. the two bristle worms Eteone het-eropoda (fam. Phyllodocidae) and Streblospio benedicti (fam. Spionidae). Further, we provide a proof-of-concept regarding the overarching objectives of the MONIS 1-3 projects and the eDNA-based test systems developed. The results constitute a baseline for future studies in Danish ports and other hotspot areas.
Project Manager/Main Author Jesper H. Andersen