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Researchers Find Key To Saving The World's Lakes
Edmonton, Canada (SPX) Jul 24, 2008 After completing one of the longest running experiments ever done on a lake, researchers from the University of Alberta, University of Minnesota and the Freshwater Institute, contend that nitrogen control, in which the European Union and many other jurisdictions around the world are investing millions of dollars, is not effective and in fact, may actually increase the problem of cultural eutrophication. The dramatic rise in cultural eutrophication-the addition of nutrients to a body of water due to human activity that often causes huge algal blooms, fish kills and other problems in lakes throughout the world-has resulted from increased deposits of nutrients to lakes, largely from human sewage and agricultural wastes. For 37 years researchers looked at Lake 227, a small lake in the Canadian Shield at the Experimental Lakes Area (ELA) in Ontario, Canada, and examined the best ways to control the cultural eutrophication process of lakes by varying the levels of phosphorous and nitrogen added to the lake. "What we found goes against the practices of the European Union and many scientists around the world," said David Schindler, professor of ecology at the University of Alberta and one of the leading water researchers in the world. "Controlling nitrogen does not correct the polluted lakes, and in fact, may actually aggravate the problem and make it worse." A previous study, entitled, A Survey of the State of the World's Lakes, found that the cultural eutrophication of lakes has had a global effect. The continent percentage of lakes with cultural eutrophication were shown as: Asia: 54 per cent Europe: 53 per cent North America: 48 per cent South America: 41 per cent Africa: 28 per cent "The damage to these lakes is a major concern for virtually every continent," said Schindler. The impact on human society is immense he says, as cultural eutrophication severely reduces water quality, which not only kills and contaminates fish, shellfish and other animals, but also can become a health-related problem in humans once it begins to interfere with drinking water treatment. Community Email This Article Comment On This Article Share This Article With Planet Earth
Related Links University of Alberta Water News - Science, Technology and Politics
Future Snowmelt In West Twice As Early As Expected
West Lafayette IN (SPX) Jul 21, 2008According to a new study, global warming could lead to larger changes in snowmelt in the western United States than was previously thought, possibly increasing wildfire risk and creating new water management challenges for agriculture, ecosystems and urban populations. |
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