The definition provided perfectly matches the concept of a keystone species. Examples include the sea otter (predator that controls sea urchin populations, preventing kelp forest destruction) or the star fish Pisaster ochraceus (predator that prevents mussels from dominating intertidal zones).
Some species if eliminated seriously affect the ecosystem. These are called
Asked in MPSC CS Prelims 2023 · Topic: Ecology (Community Ecology: Species Diversity, Edge Effect, Keystone Species)
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