Answer: The muskrat population will be adversely affected as it feed on oak trees.
Step-by-step explanation:
The muskrat is a medium sized rodent native to the North America and in some parts of Europe, South America and Asia.
These are found in wetland and is a semiaquatic animal. These small animals feed on oak trees. If a disease affects the oak trees in the area then the population of Muskrat will be decreased.
Either they will start depending on some other food else they will die due to scarcity of food.