Dead Zones

By: Inay & Kate

Question 1 (The 2 main issue)

1)summer just a few years ago when oxygen-deprived waters killed 296,000 fish in Mattox Creek, Virginia.

2)When there are excessive loads of nitrogen and phosphorus in the water, algae can "bloom" to harmful levels, changing water color, and eventually stripping dissolved oxygen from the water when they die, fall to the bottom, and decay. This dissolved oxygen is critical to the health of Chesapeake critters and waters.

Question 2 (Discuss the negative)

Dead zones are low-oxygen, or hypoxic, areas in the world’s oceans and lakes, Because most organisms need oxygen to live, few organisms can survive in hypoxic conditions Dead zones occur because of a process called eutrophication, which happens when a body of water gets too many nutrients, such as phosphorus and nitrogen

Question 3-6

3-The Floods' Lingering Effects: New Study Shows Gulf "Dead Zone" One of the Largest on Record

The Gulf "dead zone" threatens seafood production, recreation and marine life.

Extremely heavy rains and melting snows washed massive amounts of nutrients—particularly nitrogen and phosphorus—from lawns, sewage treatment plants, farm land and other sources along the Mississippi River into the Gulf of Mexico. Once in the Gulf, these nutrients, which are required for plant and crop growth, trigger algae blooms that choke off oxygen in water and make it difficult, if not impossible, for marine life to survive

4-Lake Erie, Chesapeake Bay, northern Gulf of Mexico, and the Baltic Sea.

5-Chesapeake Bay? Many coastal waters like Chesapeake Bay are susceptible to the formation of dead zones due to a combination of biological and physical factors

6- no it does affect us, but it has happened to us once

yes it cam reach our area

Question 7-10

7-The largest oxygen-depleted area - or 'dead zone' - in the entire western Atlantic Ocean occurs in the northern Gulf of Mexico on the Louisiana/Texas continental shelf. Stretching westward from the mouth of the Mississippi River in water up to 200 feet deep, it encompassed approximately 7900 square miles in 2007, an area almost as large as the state of New Jersey, and the third-largest ever recorded. The dead zone is a seasonal occurrence triggered by the high influx of nutrient-laden freshwater washing down from the Mississippi with the onset of melting snow and spring rains; it typically forms in May - though sometimes as early as February - and remains until September or October.
  • The dead zone forms in one of the most productive fisheries areas of the United States, and has led to increasing concern that catches are being adversely affected - or will be affected if hypoxic conditions continue or worsen. High losses of wetlands and riparian areas throughout the U.S. - in large part due to agricultural expansion - have exacerbated the problems associated with nutrient pollution. Wetlands and riparian vegetation, such as forests, are important natural 'sinks' in that they can retain nitrogen or convert nitrate to nitrogen gas

  • 8-who/what-Dead zones are hypoxic (low-oxygen) areas in the world's oceans and large lakes, caused by "excessive nutrient pollution from human activities coupled with other factors that deplete the oxygen required to support most marine life in bottom and near-bottom water.

    9-What Can We Do to Remedy Dead Zones?, Using less fertilizer,Implement better practices of discharge of chemicals, Finding alternative methods for sewage systems

    10- another solutions is that its kill humans because they are messing up our food and when we don't get no food at all than we all die; yes it will cause people are dying everyday because the don't have anything to eat or drink

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