Research overview: big cats as apex predators and trophic cascades

As apex predators, big cats can exert top-down control that ripples through ecosystems via trophic cascades. This overview synthesizes evidence that lions, tigers, leopards, pumas, and jaguars influence the abundance, distribution, and behavior of prey, which in turn affects vegetation, smaller predators, and biodiversity. It reviews documented cases linking predator loss to herbivore release and habitat degradation, the landscape-of-fear effects by which predators alter prey behavior without killing, and the debates over how strong and general such cascades are in different systems. The synthesis frames big cats as potential keystone species whose ecological roles justify conservation beyond their intrinsic value. For enthusiasts it explains how the presence or absence of top cats can shape entire ecosystems, why predators matter for the health of the lands they inhabit, and how their conservation is tied to ecosystem function.