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Eutrophication is a general term describing a process in which nutrients accumulate in a body of water, resulting in an increased growth of organisms that may deplete the oxygen in the water. [ 1 ] [ 2 ] Eutrophication may occur naturally or as a result of human actions.
The diagram also shows how human water use impacts where water is stored and how it moves. [ 1 ] The water cycle (or hydrologic cycle or hydrological cycle ) is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth .
The algae engage in photosynthesis which supplies oxygen to the fish and biota which inhabit these waters. Occasionally, an excessive algal bloom will occur and can ultimately result in fish death, due to respiration by algae and bottom-living bacteria. The process of eutrophication can occur naturally and by human impact on the environment.
To illustrate eutrophication I would rather use a diagram of a swamp, with little depth, still water, lots of organic matter and maybe some discharges of polluted water. Alvesgaspar 00:50, 19 December 2006 (UTC) Oppose, Support The first one is to bright, but the second has some shading making better than the first one.--
Red circles show the location and size of many dead zones (in 2008). Black dots show dead zones of unknown size. The size and number of marine dead zones—areas where the deep water is so low in dissolved oxygen that sea creatures cannot survive (except for some specialized bacteria)—have grown in the past half-century.
The diagram alongside shows how these processes fit together to form the nitrogen cycle. ... Eutrophication often leads to lower dissolved oxygen levels in the water ...
In the 1960s scientists recognized that phosphates in water caused eutrophication. [23] There was disagreement at that time about whether water with high phosphate came to have the chemical because of somehow being polluted with it. [23] By the 1970s it was established that high phosphate levels in water were a consequence of pollution. [23]
Microbial growth and dispersal are impacted by temperature and precipitation changes brought about by climate change. The entire aquatic food chain may be impacted by eutrophication, which is brought on by nutrient runoff from cities and farms. Eutrophication can also result in toxic algal blooms and hypoxic conditions. [7]