Introduction of the American grey squirrel (Sciurus carolinensis) in Europe : a case study in biological invasion

摘要: The introduction of the eastern grey squirrel (native to America) in Europe is causing a dramatic decline range native European red squirrel, due competition. Grey squirrels compete with species mainly for food; furthermore, they can maintain and spread poxvirus, which causes lethal disease Britain. According some modelling scenarios, will from Italy France Switzerland next 20-30 years, large part Eurasia long term. This would represent serious threat survival throughout its range. case study biological invasion suggests that risks posed by introduced may be minimized reduction animal trade between countries using procedure risk-assessment every imported species.