How would a sudden decrease in the shrew population affect the barn owl population?

Answer:The population of barn owl will decrease.

Explanation:

The population of the barn owl will be decreased as the barn owl feeds on the shrew population. Some of the predators include barn owl, hawks, snakes.

If there is a decrease in the food (shrew) for the barn owl then the population of the owl will decrease due to less availability of food for them.

They will breed less and then its population will decrease. So, decreased population of shrew will have decreased population of barn owl.

Owls eat shrews. If there are fewer shrews, then the owls have less to eat. With less to eat, they end up breeding less and/or starving more. So a crash in the shrew population will cause a reduction in the owl population.