What physical environment change can discourage muskrat habitation?

Increasing water depth can discourage muskrat habitation for a number of reasons. Muskrats are semi-aquatic rodents that typically prefer shallow water where they can easily access vegetation and construct their dens. Deep water reduces the availability of suitable habitats for foraging and burrowing, as muskrats need to reach vegetation both above and below the water surface. Additionally, deeper water can make it more challenging for muskrats to build their lodges and shelters, which are often constructed from reeds, cattails, and other aquatic plants.

While other options, such as planting dense shrubs or creating open areas around water, might provide different habitats or food sources, they do not directly impact the physical environment in a way that would deter muskrats as effectively as increasing water depth. Installing barriers may prevent muskrats from accessing certain areas but does not influence the underlying habitat conditions that are crucial for their survival and comfort. Therefore, increasing water depth stands out as the most effective physical change that influences muskrat habitation negatively.