Section 1:  Freshwater Ecosystems

Chapter 7 Section 1 Presentation
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Key Terms:

• wetland
• plankton
  
• nekton
  
• benthos
  
• littoral zone
  
• benthic zone
  
• eutrophication
  

Main Ideas:

• Aquatic ecosystems can be classified as freshwater ecosystems or marine ecosystems.  The plants and animals in aquatic ecosystems are adapted to specific environmental conditions.
• Freshwater ecosystems include lakes, ponds, freshwater wetlands, rivers, and streams.  The types of freshwater ecosystems are classified by the depth of the water, the speed of the water flow, and the availability of minerals, sunlight, and oxygen.
  
• Freshwater wetlands serve many functions within ecosystems.  They trap and filter sediments and pollutants; reduce the likelihood of a flood; and buffer shorelines against erosion.