What role do wetlands play in river systems?

Wetlands play a crucial role in river systems primarily by filtering pollutants from the water and providing vital habitat for a wide range of plant and animal species. This filtering process occurs as water flows through wetland vegetation, which helps to trap sediments and absorb harmful substances, thus improving water quality before it re-enters the river or other bodies of water.

Additionally, wetlands serve as essential habitats for many species, including fish, birds, amphibians, and invertebrates. They support biodiversity by offering breeding grounds and shelter. The rich variety of species that thrive in wetlands contributes to the overall health of the ecosystem, making wetlands invaluable components of river systems.

In contrast, the incorrect choices present limited or misleading views on wetlands. One option suggests that wetlands are exclusively recreational areas, overlooking their ecological functions. Another option limits wetlands to urban environments, which is not accurate as they can be found in rural and untouched areas as well. Lastly, stating that wetlands are detrimental to river diversity contradicts their established role in promoting biodiversity and enhancing ecological stability within river systems.