keystone species

The wolf is a keystone species whose presence regulates deer populations and shapes vegetation patterns.狼是一种关键物种，它的存在调节着鹿群数量并塑造了植被格局。

Removing a keystone species can trigger a cascade of changes that fundamentally alters an entire ecosystem.移除一个关键物种可能会引发一系列变化，从而根本性地改变整个生态系统。