Rivers and Streams

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Rivers and Streams

• Evan Graff

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Description

• Rivers and streams are are lotic ecosystems they
  are bodies of water that move rapidly, as opposed
  to lentic ecosystems such as lakes and ponds.
• They usually originate in the mountains and work
  their way downhill
• Rivers and streams account for 3 of the worlds
  freshwater.
• They also contain 41 of the
• worlds fish species.
• They are occupied by a wide
• variety of fish, gastropods,
• insects, and algae.

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Location

• Rivers and streams are everywhere in the world.
• Streams normally run into lakes or rivers.
• Two small rivers that combine to form a larger
  river are called tributaries.

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Eutrophication

• Eutrophication is generally a result of nutrient
  pollution
• Promotes excessive plant growth and decay, favors
  certain weedy species over others, and is likely
  to cause severe reductions in water
  
  quality.
• In this picture of the
• Potomac River, a type
• of cyanobacteria
• bloom is seen. It
• deprives all aquatic
• vegetation of sunlight.

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Extinction

• Bull Trout thrive in cold lakes and rivers, but
  as the world has grown warmer (global warming),
  the Bull Trout have begun to
  die off.
• It was also
  hunted because it feeds on
  other fish, and fishermen were afraid
  that it would threaten the
  fishing industry.

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Further Interest

• Rivers and streams cover approximately 0.8 of
  the earths surface.
• They also contain 0.009 of the earths total
  water supply.

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References

• http//en.wikipedia.org/wiki/Aquatic_ecosystemFre
  shwater_ecosystems
• http//www.nceas.ucsb.edu/nceas-web/kids/biomes/fr
  eshwater.htm