"EICAT/GISS score";"Massive (MV)/5";"Major (MR)/4";"Moderate (MO)/3";"Minor (MN)/2";"Minimal concern (MC)/1" EICAT;"Causes at least local extinction of native species, and irreversible changes in community composition; even if the alien taxon is removed the system does not recover its original state";"Causes changes in community composition, which are reversible if the alien taxon is removed";"Causes population declines in native species, but no changes in community composition";"Causes reductions in individual fitness, but no declines in native population sizes.";"No effect on fitness of individuals of native species" GISS;"Major large-scale impact with high damage and complete destruction, threat to species including local extinctions";"Major impact with high damage, major changes in ecosystem functions, decrease of species";"Medium impacts, large-scale, several species concerned, relevant decline, relevant ecosystem modifications";"Minor impacts, more widespread, also on rarer species";"Minor impacts, only locally, only on common species"