因此北太平洋海獭的近乎绝灭，导致了海胆的大量繁殖，海胆随后毁掉了迄今维持着自身生态系统的巨藻林。

Thus the near extinction of sea otters in the northern Pacific led to a proliferation of sea urchins, which then laid waste an entire kelp forest that had hitherto sustained its own ecosystem.

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各种人为干扰和自然因素促使大量物种走向濒危和绝灭。

Many species have become endangered and extinct because of natural and factitious factors.

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