The phrase "predator populations" refers to the total number of animals that hunt, kill, and feed on other animals as their primary source of food. Full definition
And their high risk - taking behavior and competitive strength, coupled with the collapse of predator populations, allowed them to more than double their population. (scientificamerican.com)
When both species are evolving, the traditional cycle may reverse, allowing predator populations to peak before those of the prey. (sciencedaily.com)
When the number of prey increases — perhaps as their food supply becomes more abundant — predator populations also grow. (sciencedaily.com)