Eutrophication Stages

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  • Created by: emilyowl
  • Created on: 13-07-16 09:44
Stage 1
Lakes and rivers: naturally very low concentration of nitrate, nitrate ions are a limiting factor for plant and algal growth.
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Stage 2
Nitrate ion concentration increases - leaching, is no longer limiting factor so populations grow.
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Stage 3
Upper layers of water become densely populated with algae: 'algal bloom'.
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Stage 4
Dense surface layer of algae absorbs light, preventing it from getting lower.
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Stage 5
Light becomes limiting factor for the growth of plants, so they eventually die
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Stage 6
Lack of dead plants and algae isn't limiting factor saprobiontic bacteria feeding and growth, populations of saprobionts grow.
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Stage 7
Increased demand for oxygen, saprobionts require oxygen for respiration.
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Stage 8
Concentration of oxygen in water is reduced, nitrates are released from decaying organisms.
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Stage 9
Oxygen becomes limiting factor for population of aerobic organisms (e.g. fish), so they die.
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Stage 10
Without aerobic organisms, less competition for anaerobic organisms whose populations rise.
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Stage 11
Anaerobic organisms decompose dead material, releasing more nitrates and toxic wastes, which makes water putrid.
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Other cards in this set

Card 2

Front

Nitrate ion concentration increases - leaching, is no longer limiting factor so populations grow.

Back

Stage 2

Card 3

Front

Upper layers of water become densely populated with algae: 'algal bloom'.

Back

Preview of the back of card 3

Card 4

Front

Dense surface layer of algae absorbs light, preventing it from getting lower.

Back

Preview of the back of card 4

Card 5

Front

Light becomes limiting factor for the growth of plants, so they eventually die

Back

Preview of the back of card 5
View more cards

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