They are the top predator in many ecosystems in which they occur.

在所处的多数生态系中，它们都是顶级猎食者。

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If a top predator disappears, change can shoot through an ecosystem.

如果最高级捕食者消失了，那么生态系统马上会改变。

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Paradoxically, the intrusion of another top predator could in someways make life easier for the white bears, says Rockwell.

但洛克韦尔也表示，颇有些自相矛盾的是，另一种大型捕食动物的入侵却让北极熊的生存更为容易了。

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You're not even the top predator out there. You know you could be food for somebody.

VOA: standard.2010.08.04

Sharks are the top predator in the ocean and are vital to its ecosystem.

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Experience with other fisheries has shown that ecosystem dynamics can change when a top predator is completely removed.

ECONOMIST: High time to save the Mediterranean bluefin

But there may be an answer: prove that the lionfish is not in fact a top predator after all, by getting people to eat it.

ECONOMIST: A heartening tale of business and the environment