Research overview: prey biomass and the bottom-up control of big-cat numbers

The abundance of big cats is governed largely from the bottom up by the biomass of their prey. This overview synthesizes the strong, repeatedly demonstrated relationship between ungulate prey density and predator density, showing that prey-rich habitats support many cats at high density while prey-depleted ones hold few even when habitat looks intact. It reviews how this principle, quantified across species, makes prey conservation the most effective lever for recovering big cats, and how prey depletion drives the empty forest syndrome and conflict with livestock. The synthesis frames prey supply as the master variable of big-cat ecology and conservation. For enthusiasts it explains why protecting deer, wild pig, antelope, and wild sheep is inseparable from protecting the cats that hunt them, and why a forest or savanna stripped of prey cannot sustain predators regardless of its vegetation.