Ocean Dead Zones Jun. 2014 | Page 4

What Cultural Eutrophication Causes:

Once the nutrients are in the water, they cause large scale algae blooms. An algae bloom is when cyanobacteria such as phytoplankton, seaweeds and algae grow in mass volumes blocking sunlight and depriving oxygen to aquatic life below it. Since an aquatic ecosystem cannot sustain such large amounts of cyanobacteria for a sustained amount of time, it eventually dies and sinks to the bottom of the ocean. Once there the decomposition process begins, which requires aerobic bacteria that takes the little remaining oxygen in the water and turns it into carbon dioxide. And once the algae sinks to the ocean floor, shellfish can absorb the toxic bacteria in algae and cause bioaccumulation through the food chain, eventually reaching our mouths (9). Only the aquatic life such as mobile fish and invertebrates can escape fast enough to survive the severe lack of oxygen, while plants and slow moving organisms perish entirely. The end result to the eutrophication process is a completely dead and uninhabitable stretch of ocean (8).

Where It Happens:

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