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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.
For example, the Black Sea dead zone, previously the largest in the world, largely disappeared between 1991 and 2001 after fertilizers became too costly to use following the collapse of the Soviet Union and the demise of centrally planned economies in Eastern and Central Europe. Fishing has again become a major economic activity in the region. [84]
Raw sewage is a large contributor to cultural eutrophication since sewage is high in nutrients. Releasing raw sewage into a large water body is referred to as sewage dumping, and still occurs all over the world. Excess reactive nitrogen compounds in the environment are associated with many large-scale environmental concerns.
One example is the whitefish species from the European Alps. [22] Eutrophication reduced the oxygen levels in their habitats so greatly that whitefish eggs could not survive, causing local extinctions. [22] However, some animals, such as carnivorous fish, tend to do well in nutrient-enriched environments and can benefit from eutrophication. [23]
Raw sewage is a large contributor to cultural eutrophication since sewage is high in nutrients. Releasing raw sewage into a large water body is referred to as sewage dumping, and still occurs all over the world. Excess reactive nitrogen compounds in the environment are associated with many large-scale environmental concerns.
Water pollution — Acid rain • Agricultural runoff • Algal bloom • Environmental impact of the coal industry • Environmental impact of hydraulic fracturing • Eutrophication • Fish kill • Groundwater pollution • Groundwater recharge • Marine debris • Marine pollution • Mercury in fish • Microplastics • Nutrient ...
Dr. John Reubec Vallentyne and Dr. W. E. Johnson of the Freshwater Institute created the Experimental Lakes Area (ELA). While Vallentyne was Scientific Leader of the Eutrophication Section from 1966 to 1972, he attracted a stellar staff of scientists from around the world in the late 1960s and early 1970s. [23]
Lake 226 was specifically studied over a four-year period, from 1973–1977 to test eutrophication. [5] Lake 226 itself is a 16.2 ha double basin lake located on highly metamorphosed granite known as Precambrian granite. [ 6 ]