Ways that healthy vegetation contribute to the health of streams?

Question

Ways that healthy vegetation contribute to the health of streams?

Answer 1

It would mean there would be a lot of plants which can hold the soil in place. If this happens, less soil will be carried off by wind or water and siltation can be avoided. With less siltation, there is a better chance for aquatic plants to survive.

When there are plenty of aquatic plants, aquatic insects and other insects which spend part of their life in water have a better habitat which would lead to an increase in their population.

With more aquatic insects, other animals like frogs and fish have more food source and this in turn will have a better chance to increase their population. The frogs and fish themselves become a food source for other animals.