数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。
Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.
这些物种在其所处的小型生态系统中可能发挥着关键性的作用，一旦消失，即使还有许多相关的物种，也会导致整个生态系统发生改变。
Such species may be key to the survival of their small ecosystem and their loss, even among many related species, can alter an entire ecosystem.
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