Environmentalists are very concerned about this issues surrounding oceanic dead zones. According to an infographic released on oceanic dead zones excessive nutrient pollution causes hypoxic (low-oxygen) areas in large lakes and world oceans.
Distance Learning students that take environmental courses focus on`the overall impact on the world as a result of oceanic dead zones. The infographic stipulates that there are more than 500 oceanic dead zones, which doubles every decade. Dead zones are known to happen naturally. Scientist have grown concerned over the amount of dead zones caused by human activity.
Hypoxic conditions are caused by eutrophication, agricultural run-offs or interfaces, such as well being dumped into rivers, and vehicular sewage and industrial emissions near a body of water.
According to a report on dead zones released by The New York Times claims that industrialization within the world, variations in eating habits and the increasing population has led to more fertilizer use and more waste in the world's watersheds.
The infographic outlines four types of hypoxia found in water. Permanent hypoxia occurs naturally ann the oxygen levels rarely rise about 2 milligrams per liter. Then you have temporary hypoxia which typically only exists for hours or days but returns the oxygen back to a level to sustain life. Seasonal hypoxia happens during the warm seasons, leaving fish and other aquatic life to migrate if possible. Finally, the Diel Cycling hypoxia which happens only during warm nights.
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