BISC 100 Lecture Notes - Lecture 13: Photic Zone, Ecotone, Biome
15 Mar 2020
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Document Summary
Rivers and streams: rivers and streams are bodies of flowing water and generally support quite different communities of organisms than lakes and ponds. A river or stream changes greatly between its source (perhaps a spring or snowmelt in the mountains) and the point at which it empties into a lake or the ocean. Near the source of a stream, the water is usually cold, low in nutrients, and clear. Downstream, the water is usually warmer, murkier, wider, and slower. Many streams and rivers have been affected by pollution from human activities and dams. Wetlands: a wetland is a transitional biome between an aquatic ecosystem and a terrestrial one. Covered with water either permanently or periodically, wetlands support the growth of aquatic plants and are rich in species diversity. Migrating waterfowl and many other birds depend on wetland pit stops for food and shelter during their journeys.
