Answer :
Any species which always occupies the highest trophic level in any community.
At what trophic level are keystone species most likely to be found?
Keystone species are often huge secondary or tertiary consumers found towards the top of a food chain, such as wolves, sea stars, sharks, and sea otters. In the absence of these predators, herbivore populations might increase and significantly alter the plant ecology. These predators regulate these populations. Top predators or tertiary consumers frequently act as keystone species. By managing other species' populations and keeping them from becoming overpopulated, these creatures maintain the equilibrium of the food chain. Frequently, but not always, a keystone species is a predator. The population and distribution of many different prey species may be managed by a small number of predators. Research on how a marine predator affects its habitat served as the foundation for the entire keystone species theory.
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