Every year starting around May, sometimes as early as February, an enormous swath of the Gulf of Mexico loses a great amount of oxygen, making some areas inhospitable to marine life. These oxygen-depleted conditions stay until September, sometimes even October. This annual occurrence is referred to as the Gulf of Mexico hypoxia or “dead zone.” Hypoxic conditions in the Gulf of Mexico are defined when levels of dissolved oxygen drop bellows 2mg/L (Hypoxia In the Northern Gulf of Mexico 2014). While dead zones occur naturally throughout the world, the hypoxia in the Gulf of Mexico is greatly exacerbated by human actions. These hypoxic and sometimes even anoxic conditions drive away marine life and can even kill those that are sessile or linger too long and find themselves unable to escape.
Although the size of this particular dead zone can vary greatly from year-to-year depending on weather conditions like droughts and hurricanes, this area has grown in size from 9,774 square kilometers in 1985 when it was first measured to its current largest area of 22,000 square kilometers in 2002. 1988 experienced the smallest dead zone with only 40 square kilometers affected by low oxygen levels. Table 1 lists the year to year size of the dead zone. In 2013, the dead zone was approximately 15,000 square kilometers, roughly the size of Connecticut (Main 2013). Figure 1 depicts the area of the Gulf of Mexico that was affected by hypoxia in 2013.
The Gulf of Mexico dead zone is caused by four main factors: nutrient loading of the Mississippi River, eutrophication, decomposition of organic material by bacteria on the ocean floor and depletion of oxygen due to stratification (Hypoxia In the Northern Gulf of Mexico 2014). These four factors combined...
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...lly and consciously (SeaWeb 2008).
Overall, the Gulf of Mexico dead zone is an area that should be taken very seriously. This is a part of the ocean that is drastically and undeniably affected directly by human activities. The economies surrounding the Gulf are very dependent on the resources they receive from it and would be devastated if economically-important species began dying off due to lack of oxygen. Although the dead zone varies in size from year to year, the area has increase exponentially ever since the birth of intensive farming practices involving nutrient-rich fertilizers. Thankfully, many efforts have been put forth to monitor and manage the dead zone. Revised farming practices along with greater environmental education for the general population with hopefully lead to a reduced risk of hypoxic conditions causing excess economic or ecological damage.
...ler C. W. "Lineations and fauts in the Texas Coastal Zone." Report of Investgations. 1976. 85, 32 pp.
Abiotic factors are things that are nonliving that influence an environment and it's inhabitants. Some of the abiotic factors that are attributed to coastal erosion in Louisiana are hurricanes, tropical storms, elevation, sunlight, overnutrition, sea-level rise, and deposition. Hurricanes bring about larger waves which cause dune erosion or beach erosion (Clark et al., 1998). This is significant because beaches and/or the dunes of the beach serve as buffers to the coastline and the ecosystem. As the beach or dunes recede from the erosion caused by these large waves and an increased sea-level the flora and fauna that help sustain the area die off or retreat to a more habitable zone leaving the wetlands in a critical state often resulting in a total loss of the area (Stockdon et al., 2012). Due to the nature of the Gulf of Mexico large destructive storms such as hurricanes or tropica...
First the causes of the dead zone will be introduced. Large contributors of excessive nutrients will be discussed. There is not one source to blame the Chesapeake Bay dead zone is a large problem with many variables that effect each other. Next the pressure that is put on the bay and its organisms will be discussed. A picture of what you might find out in the dead zone will be painted. The reality of the rapidly declining organism populations will be understood. Third, the possible solutions will be explained. Since this is a multiple variable problem there are many potential solutions that may or may not work. Last the lack of action will be observed. There are many solutions that could bring the bay back to life but the cost and lack of effort fr...
The effects of erosion and loss of marsh land in the Southern United States has devastating consequences to all of these benefits, both local and national. The loss of land can mostly be attributed to subsidence, erosion, and severe weather events. The USGS reports that a total of 118 square miles of land has been transformed to new water areas in a 9,742 square mile area from the Chandeleur Islands to the Atchafalaya River. This land loss is from fall of 2004 to the fall of 2005, after Hurricanes Katrina and Rita (USGS, February 2006).
The article indicates that the influences of oceans pollution that made by humans and caused by a phenomenon called “dead zones”. First of all, there is a great amount of plastic in the ocean which causes massive consequences for animals of the entire marine food web. On the other hand, “Dead zone” also affect Earth’s oceans. “Dead zones” can formed by many causes, such as natural causes, climate change, along human activities and industrial waste. These is a national problem and humans need to have some regulatory mechanisms. Therefore, it can helps the “dead zones” reduced. The author mentions that the US Environmental
The Chesapeake Bay is becoming a dead zone due to excessive amounts of nutrients. These nutrients feed phytoplankton which is a type of very small plant that floats. This phytoplankton in turn blocks sunlight needed by underwater grass that grows on the bed of the Chesapeake Bay. When phytoplankton die they sink to the bottom of the bay and decompose. This decomposition creates low levels of oxygen in bay. Low levels of oxygen mean that certain types of species can no longer survive in what is known as the dead zone. Populations are plummeting due to the excessive amount of nutrients, and if these nutrient levels are not reduced the dead zone will continue to grow larger.
Global warming was the main reason for the occurrence. The water of the Gulf and Mexico and the Atlantic Ocean were h...
Scavia, Donald, John C. Field, Donald F. Boesch, Robert W. Buddemeier, Virginia Burkett, Daniel R. Cayan, Michael Fogarty, Mark A. Harwell, Robert W. Howarth, Curt Mason, Denise J. Reed, Thomas C. Royer, Asbury H. Sallenger, and James G. Titus. "Climate Change Impacts on U.S. Coastal and Marine Ecosystems." Estuaries 25.2 (2002): 149-64. Gale Virtual Reference Library. Web. 2 Nov. 2013.
affects areas such as Belize, Louisiana, Nicaragua, Honduras, Yucatán Peninsula, Southern United States, Windward Islands, Eastern United States, Windward Islands,
In the three months that it took to finally put a stop to the leak, 4.9 million barrels of oil were released into the ocean. The spill caused considerable damage to marine and wildlife habitats and the Gulf’s fishing and tourism industries. The White House energy advisor, Carol Browner, goes as far as to say that the Deepwater oil spill is the “worst environmental disaster the US has faced”. The Gulf of Mexico oil spill has had an extremely negative effect on the surrounding wildlife and ecosystem. Oil spreads across the gulf, contaminating any living organism that comes into direct or indirect contact with it.
Oceans are such so vast that people underestimate the impact their actions —seeming so insignificant— have on them. Humans have by and large taken the oceans for granted; not considering how important a healthy ocean is to our survival. A popular mind-set is that the oceans are a bottomless supply of fish, natural resources, and an infinite waste dump. There are myriad reasons why the oceans should be saved and the most obvious one is marine life. With 71% of the Earth being covered by water, it is obvious that sea creatures are predominant form of life, making up 80% of the species of life on Earth. However, as important as marine life is, that is not the only reason why saving the oceans is crucial. The ocean floor provides natural resources such as, oil, natural gas, petroleum, minerals, medications, and ingredients for foods and products. The economic benefits of the oceans are huge and significant, as well. Fishing and fish products have provided employment to 38 million people and have generated about $124 billion in economic benefits. However, oceans are on the verge of crisis, marine life, natural resources, transportation, the economy, and important ingredients are at risk due to overfishing, pollution, and acidification. Thus, in this essay I will argue that, oceans are not impervious to human activity and threatening the health of the ocean threatens the health of humanity, since oceans key to our survival.
The Earth’s ocean is as mysterious to humans as outer space. Hayden states that only “5 percent” of the Earth’s waters have been explored making the deep sea highly interesting to scientists. The Mariana Trench is one of the most mysterious biomes on Earth due to its inability to be studied effectively because of its extreme depth and pressure. Kollipara states that the pressure is “over 1000 times those at sea level.” The Challenger Deep, near the island of Guam, is the deepest known part of the Mariana Trench at a depth of over 36,000 feet below sea level and has been explored by American ship called The Trieste in 1960, a Japanese probe in 1995, and the world famous director, James Cameron in 2012 (“Marianas Trench”). The Mariana Trench as a whole measures 2500 km long and 70 km. The Mariana Trench is a subduction zone where the static Mariana tectonic plate forces the colliding Pacific tectonic plate to descend below pulling rocks and other minerals below the Earth’s crust (Kaplan).
Vannela, Raveender. "Are We “Digging Our Own Grave” Under the Oceans?" Environmental Science & Technology 46.15 (2012): 7932-933. Print.
Did you know that more than 90 percent of all organisms that have ever lived on Earth are extinct? According to Pandey, the author of Humans Pushing Marine Life toward ‘Major Extinction’, nearly 10,000 species go extinct each year, and this rate is estimated to be 1,000 times higher than the natural extinction rate (1). Human beings are causing irreversible damage to the oceans and their wildlife, which is being led by two major reasons: Commercial fishing or over-fishing, which damaged the marine environment and caused a loss in the marine life diversity, and pollution, which is a primary way of the extinction causes that drastically modifies the marine life habitat. As a result of the commercial fishing and pollution, many of the marine species will start disappearing of the oceans. Briggs emphasizes that over-fishing “has induced population collapses in many species. So instead of having less than a hundred species at risk, as was the case some 30-40 years ago, there are now a thousand or more (10).”
The oceans need to be protected because it is where life began and if not taken care of, life as we know it will end. When dangerous substances go into the ocean, ecosystems are suffer and become endangered along with lives of people and of marine life. Surfrider Foundation recognizes the importance of protecting and preserving the quality and biodiversity of the world's coasts because they are truly irreplaceable. There is also historical evidence of ocean pollution being present in the past, but the problem still lingers today. Heal the Bay discovered that,“Did you know there is a DDT and PCB hot spot off the coast of Palos Verdes? This superfund site (which indicates it's one of the most polluted places in the United States), is left over from a 1930's era chemical plant. Because DDT takes so long to break down in the marine environment, it persists to this day, contaminating certain species of fish. There are also highly polluted sediments in the Long Beach area, a sign of the heavy shipping in the port. Heal the Bay works on developing effective capping and removal plans to keep those toxins from spreading” (Heal the Bay). DDT is still highly concentrated in the South Bay area and still contaminating different species of fish. Even after more than 80 years DDT, a toxic insecticide, is still very concentrated and during upwellings, DDT particles come back up and continue to harm marine life. If humans are careless about what is thrown on the floor or sprayed on lawns, it can lead to disastrous affects when it comes to the condition of the ocean's ecosystems, and can endanger life itself leading to a problem that only we can mend.