Why do keystone predators increase the diversity of prey species?

Keystone predators play a crucial role in maintaining ecosystem balance by regulating prey populations. By controlling the numbers of dominant prey species, they prevent any single species from monopolizing resources, which allows for a greater diversity of species to thrive. This dynamic fosters a more complex food web and enhances overall biodiversity, as various prey species can coexist and fill different ecological niches. Ultimately, the presence of keystone predators promotes a healthier and more resilient ecosystem.