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EUTROPHICTION CAN BE:

HUMAN CAUSED
• When nutrients accumulate.
• production and consumption within the lake do not occur at equal rates and the lake slowly becomes over fertilized.NATURAL
• Example: Untreated sewage effluent and agricultural run-off carrying fertilizers

ECOLOGICAL EFFECTS:




















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SOLUTIONS:THERMAL POLLUTION
• Thermal pollution is the degradation of water quality by any process that changes ambient water temperature.
• A common cause of thermal pollution is the use ofwater as a coolant by power plants and industrial manufacturers.

• COLD WATER: Releases of unnaturally cold water from reservoirs can dramatically change the fish and macroinvertebrate fauna ofrivers, and reduce river productivity.
• WARM WATER:Elevated temperature typically decreases the level of dissolved oxygen (DO) in water. The decrease in levels of DO can harm aquatic animals suchas fish, amphibians and copepods.

HOW TO CONTROL IT

Heated water from these sources may be controlled with:
• cooling ponds, man-made bodies of water designed for cooling by evaporation,convection, and radiation
• cooling towers, which transfer waste heat to the atmosphere through evaporation and/or heat transfer
• cogeneration, a process where waste heat is recycled fordomestic and/or industrial heating purposes


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Scientific term describing the overfertilization of lakes with nutrients and the changes that occur as a result.
nutrient inputlight
temperature

All three of these factors are required for the increased growth rates of phytoplankton that lead to eutrophication.




DECREASE BIODIVERSITY:
When an ecosystemexperiences an increase in nutrients, primary producers reap the benefits first.

NEW SPECIES INVASION
May cause cause competitive release by making abundant a normally limiting nutrient. This process...