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.

• 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。