What is the immediate result of direct predation described as 'top-down control'?

Answer

A measurable reduction in the prey population size available to reproduce

Direct predation is the act of consumption, which immediately reduces the number of individuals in the prey population, placing measurable pressure on the breeding pool.

What is the immediate result of direct predation described as 'top-down control'?
populationEcologyPredatorregulationprey