"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

田纳西大学生态学和进化生物学教授唐·史密斯说：“只有一小部分外来物种会在新栖息地引发问题。”

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"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.

“只有一小部分外来物种会在它们的新栖息地引发问题。”田纳西大学生态学和进化生物学教授唐·史密斯说。

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"Imagine if you hung out with the same three people every day," added Pollard, a researcher in the Department of Ecology and Evolutionary Biology at the University of California, Los Angeles.

“想像你每天和同样的三个人出去玩，”珀拉德补充道，他是洛杉矶加州大学生态学与进化生物学学院的一名研究人员。

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"Introduced species are one of the principal causes of endangerment for half of endangered species, " says Daniel Simberloff, a professor of ecology and evolutionary biology at the University of Tennessee.

CNN: Fish tale