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Eutrophication of waters

The Eutrophication is the enrichment of nutrients of an ecosystem. The nitrogen and phosphorus are limiting factors in a natural ecosystem, and limits the amount of biomass. But if there is an increase, due to contamination (from bad agricultural practices or soaps), of nitrates and phosphates, nutrients necessary for photosynthetic primary producers, there will be an increase in the amount of biomass (algae and other organisms).

The high amount of algae that is generated clouds the water and prevents the light from reaching the bottom and photosynthesis can take place and produce oxygen. In addition, when organisms die they are decomposed by microorganisms and they end up with the little oxygen that was left, making life in that ecosystem impossible.