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.
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.
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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