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Invasive species 侵略性物种 Thorny questions 棘手问题 The ecological effects of buckthorn in NorthAmerica 北美鼠李属植物的生态影响 CONSERVATIONISTS, being by definition conservative, usually view the introduction ofnew species into an environment with horror. 生态环境保护者，从定义上看就偏于保守，常对固有环境中新物种的引入恐惧不已。 If such a species is successful, it is described as invasivea rather pejorative word. 一种新物种一旦引入成功，它常常具有侵略性一个含贬义的词语。 But how much change such species actually cause is often moot. 然而，这些物种究竟造成环境多少改变? So two recent studies of European buckthorn in North America, which attempt to find thisout, are a welcome shaft of light on the debate. 常常引来争论。最近对鼠李属植物的两项研究有助于搞清这一问题。所以该研究在这场争论中受人瞩目。 Buckthorn was imported from Europe to America in the 19th century, to make gardenhedges. 鼠李属植物在19世纪从欧洲出口到美国，用来制作花园围篱。 | 
