If a bird species that prefers blue berries entered the area, how would it affect the number of bushes that make each color of berry?

The number of bushes would decrease, as the bird species would need to eat the berries off of the bush. The species would continue multiplying and eating on the food until there is none left, causing the species to have to migrate to a new area that satisfies there needs.

Okay cool  so what is the question?

What is it that you need with?