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Nitrogen and phosphorus, the most frequently discussed of all nutrients, enter the lakes from many sources, including municipal and industrial wastewater discharges, agricultural fields, highways, parking lots, shoreline erosion, and precipitation. The nitrate and phosphate pollution nourish the algae, sometimes resulting in more algae than the lake can support. As the algae spread, decomposers break down the dead organisms and use up oxygen at the bottom of the lake. |
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1. Identify and distinguish point sources
from non-point sources of phosphorus entering the lakes.
2. How does change in water temperature relate to eutrophication processes? 3. Total phosporus loading to Lake Erie from all external sources declined from a peak of 28,000 tons in 1968 to 12,400 tons in 1982. What efforts had been done during this period? |
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1. Lake Erie water quality: Past, present
and future. (free. FS-046)
2. Lake Erie water quality during the 1970s and early 80's. (free. FS-040) 3. Ohio's Areas of Concern. (free. FS-041) For more information, visit OSG website or call OSG office at (614) 292-8949 |
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1. The Great Lake Erie
2. Great Lakes Instructional Materials for the Changing Earth System 3. Earth Systems - Education Activities for Great Lakes Schools Great Lakes Environmental Issues Life in the Great Lakes
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The
Process of Eutrophication (Penn State University)
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1. Ohio Surface Water Quality slideshow http://www.dnr.state.oh.us/odnr/dnap/nonpoint/index.html 2. 25 Years of Great Lakes Protection http://www.epa.gov/25water/protect.html 3. Great Lakes Pollution Prevention Fact Sheets http://www.epa.gov/grtlakes/p2/factsh.html 4. Eutrophication: A Limited and Threatened Water Supply http://www.personal.psu.edu/users/d/l/dlw170/ |