The Baltic Sea has dead zones year round and annually
"Eutrophication, the over enrichment of the sea by nutrients ,principally compounds containing nitrogen and phosphorus, that promote plant growth" (Mee)
Dead organisms end up in the shores of Baltic Sea, Black Sea, Seto Inland Sea Gulf of Mexico, Oregon Coast and others because of oxygen depletion.
“Fertilizing chemicals cause microscopic plants floating near the surface to overgrow, depriving any plants living on the bottom of light and leading to large increases in the amount of decaying organic material falling to the seafloor. The bacteria living off the dead organisms use up seafloor oxygen, thereby causing the loss of most animal life there” (MEE)
"This basic sequence—eutrophication leading to phytoplankton blooms, excess bacterial activity at the bottom, oxygen depletion, and the death of existing plants and animals—has occurred in almost every dead zone examined by researchers." (MEE)
"Eutrophication produces massive phytoplankton blooms, cope-pods often are unable to graze on the new, abundant phytoplankton species as well as the large quantities of organic detritus that result from the disruption of the natural ecosystem." (Mee)
Mee uses evidence to support her claim that the formation of dead zones are a huge impact in marine ecosystem in a negative way. She uses the Black Sea to give an example of how too much nutrients ,can have a negative way on the undersea ecosystem. She provides data that says between the 1960s and 1980s the sea fell into eutrophication when the level of nitrogen and phosphorus double. The cause for the increase of nitrogen and phosphorus in the sea were agriculture runoff, urban and industrial waste water that cause the phosphorus levels to double, the atmospheric transport cause nitrogen levels to increase in sea levels. This was not good because then phytoplankton bloom in the surface of the water. Causing the highly diverse ecosystem to be alter and many organism were extinct.
Mee says that there is a way to restore dead zones she says by reducing the nutrient from the near land but it can never reestablish the ecosystem that got destroy. This article is proof of how humans can destroy ecosystems .She believes that "European authorities have to take steps to ensure that renewed economic development does not lead to the resurgence of terrestrial nutrient release to the sea" (MEE) . I think that every country should take action in protecting the ocean and the organisms that live there. We dependent on the ocean and it's marine life economically and also for the human diet. We need to protect the ocean by not giving to much nitrogen and phosphorus to the ocean.