Reason of eutrophication

Answer 1

by p dMember since:May 23, 2006Total points:196 (Level 1)

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Best Answer - Chosen by Votersit is a natural process in lakes, estuaries.But sometimes human acts accelerate the system.Here excessive amounts of plant nutrients (primarily phosphorus, nitrogen, and carbon) are added to streams and lakes in various ways. Runoff from agricultural fields, field lots, urban lawns, and golf courses is one source of these nutrients. Untreated, or partially-treated, domestic sewage is another major source. Sewage is a particular source of phosphorus to lakes when detergents containe large amounts of phosphates.this leads to the excessive growth, or"blooms", of algae promoted by these phosphates.

these algae cover the entire surface, thus disallows penetration of sunlight to lower parts of the waters and thus the submerged flora get affected.tyey also cause depletion of oxygen and the fishes are killed.Sometimes those fishes are replaced by species more resistant to the new conditions.

Thus eutrophication can be considered a form of pollution because it promotes plant growth, favoring certain species over others and forcing a change in species composition. eventually the entire ecosystem gets afftected....phytoplankton...zooplankton… and small water creatures....the birds feeding on them and all.Doies it afects the biodiversity to a very large extent.Sometimes the algae ecen give out toxins for the animals there.

Surveys showed that 54% of lakes in Asia are eutrophic; in Europe, 53%; in North America, 48%; in South America, 41%; and in Africa, 28%.

Answer 2

The main causes of eutrophication are:

• natural run off of nutrients from the soil,
• over application and run off of inorganic fertilizer,
• over application and run off of manure from farms,
• discharge of phosphate rich detergents,
• discharge of partially treated or untreated sewage,
• industrial waste waters which are rich in nutrients (from canneries and meat processors)

Answer 3

What happens is that the ecosystem becomes rich with nutrients- therefore making more fertile soil to produce more food which will in turn produce more energy for the animals who eat them and so on.

Answer 4

When artificial or non - artificial substances, add fertilisers or sewage to a fresh water stream, lake or water body, increasing the amount of nutrients in the water.

Answer 5

I'm not sure, but I really need the answer.

Answer 6

In water

Answer 7

What happens when an ecosystem undergoes eutrophication?