Definition of keystone species in English:

keystone species

Syllabification: key·stone spe·cies

noun (plural same)

A species on which other species in an ecosystem largely depend, such that if it were removed the ecosystem would change drastically.
More example sentences
  • Well, you remove a keystone species and the entire ecosystem can collapse.
  • A keystone species in several ecosystems, the grizzly was listed in 1975 as threatened in the lower 48 states.
  • Meanwhile the keystone species of the entire ecosystem - the humble capelin - has again become the target of a sizeable fishery.

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Word of the day anomalous
Pronunciation: əˈnämələs
deviating from what is standard, normal, or expected