Data from: Ecological impact assessments of alien species in Norway ...

• Main Authors: Sandvik, Hanno, Hilmo, Olga, Henriksen, Snorre, Elven, Reidar, Åsen, Per Arvid, Hegre, Hanne, Pedersen, Oddvar, Pedersen, Per Anker, Solstad, Heidi, Vandvik, Vigdis, Westergaard, Kristine B., Ødegaard, Frode, Åström, Sandra, Elven, Hallvard, Endrestøl, Anders, Gammelmo, Øivind, Hatteland, Bjørn Arild, Solheim, Halvor, Nordén, Björn, Sundheim, Leif, Talgø, Venche, Falkenhaug, Tone, Gulliksen, Bjørn, Jelmert, Anders, Oug, Eivind, Sundet, Jan, Forsgren, Elisabet, Finstad, Anders, Hesthagen, Trygve, Nedreaas, Kjell, Wienerroither, Rupert, Husa, Vivian, Fredriksen, Stein, Sjøtun, Kjersti, Steen, Henning, Hansen, Haakon, Hamnes, Inger S., Karlsbakk, Egil, Magnusson, Christer, Ytrehus, Bjørnar, Pedersen, Hans Christian, Swenson, Jon E., Syvertsen, Per Ole, Stokke, Bård Gunnar, Gjershaug, Jan Ove, Dolmen, Dag, Kjærstad, Gaute, Johnsen, Stein Ivar, Jensen, Thomas C., Hassel, Kristian
• Format: Dataset
• Language: English
• Published: Dryad 2020
• Subjects: alien species; area of occupancy; door-knocker species; ecological effect; ecological impact; genetic contamination; introduction pathway; Invasion potential; quantitative impact assessment; Norway; Svalbard; Jan Mayen; Arctic; Arctic Archipelago
• Online Access: https://dx.doi.org/10.5061/dryad.8sf7m0cjc; https://datadryad.org/stash/dataset/doi:10.5061/dryad.8sf7m0cjc

Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in local biodiversity and ecosystem functioning, and, ultimately, to biotic homogenisation. We risk-assessed all alien plants, animals, fungi and algae, within certain delimitations, that are known to reproduce in Norway. Mainland Norway and the Arctic archipelago of Svalbard plus Jan Mayen were treated as separate assessment areas. Assessments followed the Generic Ecological Impact Assessment of Alien Species (GEIAA) protocol, which uses a fully quantitative set of criteria. A total of 1519 species were risk-assessed, of which 1183 were species reproducing in mainland Norway. Among these, 9% were assessed to have a severe impact, 7% high impact, 7% potentially high impact, and 49% low impact, whereas 29% had no known impact. In Svalbard, 16 alien species were reproducing, one of which with a severe ... : The species assessed were a subset of the inventory of alien species in Norway (described by Sandvik et al., Biological Invasions 21:2997, 2019). The assessments followed the Generic Ecological Impact Assessment of Alien Species (GEIAA, described by Sandvik et al., Biological Invasions 21:2803, 2019). ...