If the population of a species increases or decreases, what happens to the species that consumes them?

If the population of a species increases, the species that consumes them may also increase as they have more food available. On the other hand, if the population decreases, the species that consumes them may also decrease as their food source becomes less available. However, this is not always the case, as some predator species have alternative food sources and may not be solely dependent on the affected species for survival.