Rivers provide many critical goods and services, including drinking water, power generation, nutrient recycling, organic matter retention, habitat for many unique plants and animals and recreational activities. Rivers in the northern Great Lakes region have a rich history, and the roles they play are reflected in the land use and vegetation associated with that region.
JOHNSON, L. HAYHOE, K. KLING, G. MAGNUSON, J. SHUTER, B. (2003): River And Stream Ecosystems. Cambridge: Union of Concerned Scientists USA (UCSUSA) URL [Accessed: 15.12.2011] PDF