Keystone Species Definition

kēstōn
noun
The definition of a keystone species is a group of living organisms that has a drastic effect on their overall ecosystem.
An example of a keystone species is the grizzly bear, because as a preditor it keeps down the number of moose and elk.
YourDictionary

(ecology) A species that exerts a large, stabilizing influence throughout an ecological community, despite its relatively small numerical abundance.

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