LAKE ERIE CASE STUDY EUTROPHICATION AND DEAD ZONES

NOAA hopes to use these data to make better political decisions and to have a better understanding of how algae blooms develop so rapidly. However, with anthropogenically increased nitrogen and phosphorus input, algae growth is no longer limited. Hence, focusing on one river may improve algae conditions, but not the dead zone. The dead zone is caused by nutrient enrichment from the Mississippi River, particularly nitrogen and phosphorous. Good article but hypoxia is reduced oxygen low concentration , not the lack of it.

Both are water quality problems. Algal blooms and dead zones in Lake Erie were severe during the s, caused primarily by large releases of phosphorus from sewage and industrial plants. Changes in the timing and method of applying agricultural fertilizer are the primary drivers behind the increasing amounts of phosphorus entering Lake Erie and causing toxic algal blooms and a large dead zone, according to new basin-wide scientific studies. Instead, the models showed that current weather patterns, when coupled with agricultural conditions in the s, did not create a problem. Its area varies in size, but can cover up to 6,, square miles. Compounding the changes in agricultural practices are changes in climate in the Great Lakes region, which could affect water quality in the lakes.

The studies, drawing on institutions from across casee Great Lakes, also found that climate change is increasing the urgency of developing ways to keep fertilizers on fields, and may mean that larger reductions in phosphorus will be necessary to alleviate Great Lakes algal blooms. Satellite image of a toxic algae bloom in Lake Erie inone of the worst blooms in recent years. According casee the Huffington Post on August 6,more thanof the human population living near or around Lake Eutgophication did not have access to safe drinking water because of algal blooms Kate, Until the surface water cools off in the fall, the deep water cannot rise to the surface, meaning its supply of oxygen has to last all summer.

Lake Erie Dead Zone: Don’t Blame the Slime!

For instance, inheavy spring storms triggered a record-setting algal bloom in west Lake Erie, but that year there was a relatively small dead zone in the lake, the study reports. Weak wind patterns and reduced lake circulation deadd allowed the large dutrophication of phosphorus washed into the lake by spring storms to sit in the western basin for longer than normal, leaving huge amounts available to feed algae once warm summer temperatures arrived.

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Consequently, algal blooms develop, the food chain is altered, and dissolved oxygen in the area is depleted.

NOAA hopes to use these data to make better political decisions and to have a better understanding of how algae blooms develop so rapidly. Her interests include food security, ecology and the Great Lakes. North America’s ‘Third Coast’ ] “It’s the way in which the water comes that will change, and that can lead to very different but quite negative impacts on the water quality in Lake Erie,” Michalak told Live Science.

Changes in agricultural practices include: Compounding the changes in agricultural practices are changes in climate in the Great Lakes region, which could affect water quality in the lakes. A series of intense spring storms infor example, drove a record algal bloom in the lake that summer. Instead, the models showed that current weather patterns, when coupled with agricultural conditions in the s, did not create a problem.

The federal Clean Water Act and the bi-national Great Lakes Water Quality Agreement led to dramatic reductions in phosphorus from these sources and a rapid improvement in water quality. Decades of dumping bring Chitlopakkam Lake to the edge.

The government is also funding efforts to restore wetlands along the Gulf coast to naturally filter the water before it enters the Gulf. Sluggish winds and parched rivers both promote stratification. Other factors, like temperature and winds that drive lake circulation, also play a role in the size and intensity of algal blooms.

Don’t Blame the Slime! The Stream, March Michalak and her eutrophicatio are examining how climate change is likely to worsen Lake Erie’s environmental issues.

Lake Erie Dead Zone: Don’t Blame the Slime!

Click image to enlarge. These health problems may occur not just from eutrophiation it, but also through skin contact, such as swimming in the polluted water or taking a shower in your house. The researchers ruled out any link between the western basin’s algal blooms and the central dead zones. Zebra and quagga mussels invaded Lake Erie during the s and were eating phytoplankton, which eliminated non-toxic algae, therefore lowering its egie to compete with algae that are highly toxic.

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lake erie case study eutrophication and dead zones

To examine why dead zones develop in Lake Erie, lead study author Yuntao Zhou looked at historical weather records, data on lake and river conditions zoones other factors. According to models used in the EcoFore project, climate changes srudy would not be enough to create the observed rise in dissolved reactive phosphorous.

The zone occurs between the inner and mid-continental shelf in the northern Gulf of Mexico, beginning at the Mississippi River delta and extending westward to the upper Texas coast. Upwelling oxygen-rich water or destruction of the stratification can alleviate this problem. Hide Caption Satellite image of the Gulf of Mexico.

The lack of oxygen is called anoxia. Becky Oskin, Contributing Writer on. The Gulf of Mexico dead ans is one of the largest in the world. Despite the differences, both of Lake Erie’s environmental problems are ultimately caused by agricultural runoff and human activity, which result in too much phosphorous entering the lake, said study zojes Anna Michalak, an earth scientist at the Carnegie Institution of Science at Stanford University in California.

lake erie case study eutrophication and dead zones

The Gulf of Mexico is a major source area for the seafood industry. The Gulf of Mexico dead zone is an area of hypoxic link to USGS definition less than 2 ppm dissolved oxygen waters at the mouth of the Mississippi River.