And increase in food and a decrease in predators would most likely

An increase in food and decrease in predators would most likely create a habitat that would be over run by animals. Without predators these animals will take over the area and become a nuisance to people and other animals in the area. One example would be the starling in New York city. They were released in Central Park and had no natural predators so they became to flourish and would invade and take over the area from other birds.