A species that is so important to its community (such as the sea otter)that their removal can dismantle a food web is termed a:

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The term "keystone species" refers to a species that has a disproportionately large effect on its environment relative to its abundance. These species are often so important to their community that their removal can cause significant changes to the ecosystem. The sea otter is a classic example of a keystone species, as its predation on sea urchins helps to maintain kelp forests and the many species that depend on them.

A Species That Is So Important to Its Community (Such