how eutrophication occurs

• Eutrophication


  The nutrient enrichment of waterways
• eutrophication 1- nutrient load up

  excessive nutrients from artificial fertilisers flushed from land into rivers by rainwater or run off.
• eutrophication 2 - plants flourish

  pollutants cause aquatic growth ( mainly algae; duckweed and other plants ) they quickly run off nitrates and die
• eutrophication 3 - algae bloom

  algae bloom prevents sunlight from reaching plants lower in water
• eutrophication 4 - decomposition depleted oxygen

  dead plants are broken down by bacteria decomposers which use up more oxygen in water ( respiration )
• eutrophication 5 - death of ecosystem

  oxygen levels reach point where no life is possible. Organisms and fish die.