This process induces growth of plants and algae and due to the biomass loa may result in oxygen depletion of the water body. One example is the bloom or great increase of . Rapporter et annet bilde Rapporter det støtende bildet. It is an abnormal growth of algae, a clear manifestation of a process called eutrophication.

Why should we worry about eutrophication and how is this problem managed?

Fertilisers are often used in farming, sometimes these fertilisers run-off into nearby water causing an increase in nutrient levels. Eutrophication can be a natural process in lakes, occurring as they age through geological time. A secondary school revision resource for Edexcel GCSE Biology about water pollution, air pollution and eutrophication. This causes phytoplankton to grow . Excessive amounts of nutrients encourage the growth of algae and other aquatic plants, which in turns leads to multitude of negative effects such as extensive growth of algae ( algae blooms) and oxygen depletion in the sea. The good news is that many of the . When aquatic systems have an overabundance of.

An enrichment by or excess of nutrients to the water is called eutrophication and may result in an explosive growth of algae.

It is important to carefully consider any action of removal of algae from a body of water: oxygen supplied by algae during photosynthesis in beneficial to most forms of life in streams, thus the removal would often be a detriment rather than a benefit. The two most acute symptoms of eutrophication are hypoxia (or oxygen depletion) and harmful algal blooms, which among other things . Diagram illustrating the mechanisms by which aquaculture can contribute to eutrophication and hypoxia. Image Credit: Michael L. Aquaculture (fish farming) is another growing source of nutrient pollution.

Annual aquaculture production worldwide . The additional nutrients are food for algae and fish, so the more eutrophic a lake is, the more living organisms it sustains. Although many definitions exist , it is generally defined as an increase in nutrients such as nitrogen and phosphorus that increase algal growth. Depending on the degree of eutrophication , severe . One important result of lake and reservoir enrichment is increased growth of microscopic floating plants, algae, and the formation of dense mats of . This NASA Earth Observatory image shows the region where the Mississippi River meets the Gulf of Mexico. It illustrates how sediment is moved from the land to the sea.

The Mississippi River carries millions of tons of nutrient-rich sediment into the Gulf each year. A bloom of algae along the shoreline of Lake Erie, resulting from nutrient- enrichment, or eutrophication. When this occurs, large blooms of algae and aquatic plants occur, fed by the excess nitrogen . It is characterized by dense algal and plant growth owing to the enrichment by phosphorus and nitrogen nutrients needed for photosynthesis.

Nutrient over-enrichment causes elevated levels of algal and plant growth, increased turbidity, oxygen depletion, changes in species composition and nuisance blooms of algae.

What happens when fertilisers get washed into lakes and rivers? A process called eutrophication. How eutrophication , caused by extra nutrients in runoff, can lead to dead zones. In England and Wales, eutrophication has been a . Atmospheric deposition of nitrogen, together with the deposition of phosphorus-rich sediments by floods, can . Cultural or artificial eutrophication occurs when human activity introduces increased amounts of these nutrients, which speed up plant growth . This enhanced plant growth, often an algal bloom, reduces dissolved oxygen in the water .