由于其中可能涉及复杂的物种相互作用,通过移除一个关键物种并观察生态系统的变化来确定该物种是有问题的。
Because complex species interactions may be involved, identifying a keystone species by removing the species and observing changes in the ecosystem is problematic.
你看看能不能识别出你在沙滩上观察到的水母,以及它们是怎样融入当地的生态系统的。
See if you can identify the jellyfish you observed on the beach and how they fit into the local ecosystem.
Stolzenburg说,这些岛屿本质上就是参照系,用以观察世界上的入侵物种是如何不可逆转地改变脆弱的生态环境的。
Stolzenburg says the islands essentially serve as metaphors for how the world's invasive species can irreparably alter fragile ecosystems.
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