Understanding the biology of alien invasive species (AIS) is a problem for pure,as well as applied biology.However,it is obviously not possible to conduct designed experiments to further our understanding.We can,however,study actual invasions;the next best thing.We used historical data from New Zealand to explore the correlates of successful establishment of species in a new environment.Surprisingly,biological differences between species explained little of the variation in establishment success.Instead,what matters is how often,and in what numbers,a species is introduced into the new environment.%了解外来入侵物种(alien invasive species,AIS)的生物学涉及纯生物学及应用生物学的问题.但是靠预先设计的实验来加深人们的了解显然是不可能的.然而我们可以研究现有的入侵,这也是一个很好的途径.本文利用新西兰历史上的一些记录,探讨了物种在新环境中成功定居的因素.令人惊奇的是,物种间的生物学差异对成功的定居几乎没有什么作用,相反,真正起作用的是一个物种被引入新环境的频率及数量.
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