生态学家曾一度认为，物种多样性使生态系统变得稳定。
At one time, ecologists believed that species diversity made ecosystems stable.
然而一个同样重要的标准是，物种在随机性全球生态灾难中幸存的能力。
Yet an equally important criterion is the ability of a species to survive random global ecological catastrophes due to impacts.
许多生态学家说，这些入侵物种仅次于栖息地的丧失，是对全球生物多样性的最大威胁。
Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.
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