Surprisingly few extinctions of indigenous species can be attributed to competition from introduced species.

令人惊讶的是，本土物种的灭绝很少归因于外来物种的竞争。

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They say that portraying introduced species as inherently bad is an unscientific approach.

他们说把外来物种描绘成天生的坏物种是一种不科学的做法。

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Introduced species can often undergo a population boom just after introduction.

被引进的物种在刚被引入之后往往会发生数量暴增。

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However, the team warned that the volume of introduced species had increased markedly as the 1900s advanced.

BBC: Invasive species have a 'delayed legacy', says report

"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

On April 30th Mr Alarcon issued an emergency decree to stem the tides of pollution, immigration, illegal fishing and the kind of introduced species that threaten the islands' fragile ecosystems.

ECONOMIST: Galapagos