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How do predators sometimes increase the number of species in a community?

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biology; microscope — Biology A researcher using a microscope to examine a specimen in the laboratory.

Predators can increase the number of species in a community by acting as keystone species. By exerting top-down control, these predators prevent any single prey species from becoming overly dominant and monopolizing essential resources.1

When a top predator is present, it limits the population size of its prey through hunting. This activity creates space and resources for other species to coexist that might otherwise be outcompeted or excluded by the dominant prey population. Conversely, the removal of top predators can trigger a trophic cascade, often leading to a decline in biodiversity as prey populations explode and overconsume resources, or as mesopredator release occurs, where medium-sized predators increase in number and suppress other species.12

Maintaining these predatory roles is essential for ecological balance, as it preserves the structure and diversity of the biological community.12