Why does the formation of swamps occur? What is the role of swamps in nature?

Unfortunately, in recent years, the formation of swamps is largely due to human activities – so great is his influence on the world around him. The creation of fill-up areas on water bodies, the construction of dams lead to a change in the relief, and as a result, to a change in the flora and fauna. Natural ways of formation of bogs are associated with overgrowth of water bodies, an increase in the amount of moisture in soils. Natural swamps accumulate a large amount of clean fresh water, and supply it to rivers and streams. Swamps, together with the forests in which they are located, are unique natural sites where certain types of plants grow.