Final answer:
With the introduction of more predators, the pheasant population is likely to decrease due to higher rates of predation, as predators capture more prey and the availability of pheasants as a food source diminishes.
Step-by-step explanation:
In an ecosystem where the number of predators are increased, we would typically observe a decrease in the prey population due to increased predation. Given that the ecosystem initially has plenty of food, water, cover, and space to support a large population of pheasants, the introduction of more predators would lead to a higher predation rate. This increased predation would result in more pheasants being captured, leading to a decrease in their population size. As the pheasant population starts to decline, there would be fewer individuals to be preyed upon, which might eventually cause the predator population to decrease as well. Hence, the most likely impact on the pheasant population due to an increased quantity of predators is a decrease in their population size.