"In particular, island animals, which have existed in seclusion from outsiders and are thus less aggressive, often don't know how to run away or what to do when encountering natural enemies from outside," says Yang Ping-shih, professor of plant pathology and entomology at NTU. Island ecologies are more vulnerable than continental ecologies. As a result, Taiwan gives outside species a better chance.
「尤其是島嶼生物，一向在與外界隔離狀態下生活，較缺乏侵略性，遇到外來的天敵多半不知如何逃避或因應」，台灣大學植物病蟲害系主任楊平世解釋，島嶼生態比陸塊生態脆弱，台灣也因此給外來者較多可乘之機。