In some case, non-native species of oysters are introduced after a population decline, and they bring with them diseases that further kill off the native oysters.

在一些例子中，非本土种类的牡蛎会在本土数量下降后引入，它们随身带来的疾病会进一步杀死光本土牡蛎。

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Mr Parzer and Dr Moczek looked at beetles from the east and west of Australia (where it was deliberately introduced to deal with the dung of non-native livestock) and North Carolina, together with an aboriginal population from Italy.

ECONOMIST: Evolution