Key stone species should be protected from hunting or gathering in order to keep the healthiest ecosystem. One illustration of a keystone species in North America is the American Beaver (Castor canadensis).
Claim: Some species are essential to the survival of the other species in the ecosystem in every environment.
Reason: A large predator or a little plant could be the keystone species, but without them the ecosystem might not exist. If a keystone species vanished, some ecosystems might not be able to adjust to environmental changes.
Evidence: Often, it takes the extinction of a keystone species for the importance of that species in an ecosystem to be fully understood. Robert Paine, an ecologist who popularised the phrase "keystone species" in the 1960s, discovered the significance of such species while researching starfish along Washington state's rugged Pacific coast.
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