More than ‘‘100 worst’’ alien species in Europe

• Published in: Biological Invasions
• Main Authors: Nentwig, Wolfgang, Bacher, Sven, Kumschick, Sabrina, Pysek, P, Vila, M
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer 2018
• Subjects: 570 Life sciences; biology; 590 Animals (Zoology); 580 Plants (Botany); Branta canadensis; Mite
• Online Access: https://boris.unibe.ch/116200/1/Nentwig%20et%20al%20Biol%20Invasions.pdf; https://boris.unibe.ch/116200/

‘‘One hundred worst’’ lists of alien species of the greatest concern proved useful for raising awareness of the risks and impacts of biological invasions amongst the general public, politicians and stakeholders. All lists so far have been based on expert opinion and primarily aimed at representativeness of the taxonomic and habitat diversity rather than at quantifying the harm the alien species cause. We used the generic impact scoring system (GISS) to rank 486 alien species established in Europe from a wide range of taxonomic groups to identify those with the highest environmental and socioeconomic impact. GISS assigns 12 categories of impact, each quantified on a scale from 0 (no impact detectable) to 5 (the highest impact possible). We ranked species by their total sum of scores and by the number of the highest impact scores. We also compared the listing based on GISS with other expert-based lists of the ‘‘worst’’ invaders.We propose a list of 149 alien species, comprising 54 plants, 49 invertebrates, 40 vertebrates and 6 fungi. Among the highest ranking species are one bird (Branta canadensis), four mammals (Rattus norvegicus, Ondatra zibethicus, Cervus nippon, Muntiacus reevesi), one crayfish (Procambarus clarkii), one mite