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Great Lakes Glossary

This glossary describes and provides hypertext links to and contact information for the principal U.S. and Canadian organizations involved in Great Lakes management.  It also describes and links to the fundamental agreements and laws regarding  the Great Lakes, as well as a few key terms and phrases regarding Great Lakes management and rehabilitation.

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Visit Great Lakes Internet Resources for links to other relevant online sources of information.

 


International Agreements and Organizations

 

 

 

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U.S. Organizations

 


1451 Green Rd., Ann Arbor, MI 48105, phone (734) 994-3331

 

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U.S. Laws and Agreements

 

 

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Canadian Organizations

 

 

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Canadian Laws and Programs

 

 

 

 

 

 

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Some Definitions

Areas of Concern (AOCs): The IJC Great Lakes Water Quality Board has identified serious water quality problems at 43 specific areas on the Great Lakes, particularly harbors and bays. At these sites, levels of critical pollutants-- toxic substances such as PCBs, DDT and dieldrin--exceeded goals set in 1978 by the Great Lakes Water Quality Agreement. In 1981, the IJC water quality board called for a comprehensive "ecosystem approach" to solve these problems and designated the sites themselves as "areas of concern." Of the 43 "areas of concern" on the Great Lakes, 26 are in the United States, 12 are in Canada, and five are on the international border. More than half these areas are contaminated by conventional pollutants, such as those discharged by industries and municipalities. However, contaminated sediments or "in-place pollutants" pose a far more common problem.

 

Ecosystem Approach: This term describes the comprehensive effort needed to rehabilitate and protect the biological, physical and chemical components of the Great Lakes basin. (The idea that lakes are integrated systems of living organisms and chemical and physical conditions was first promoted by E.A. Birge, a pioneering limnologist at the University of Wisconsin.) The use of an "ecosystem approach" to restore and maintain the integrity of the Great Lakes was first embraced in the 1978 by the Great Lakes Water Quality Agreement between the United States and Canada.

 

Eutrophication: This is the process by which lakes "age." Although it occurs naturally, eutrophication can accelerate when human activity adds nutrients, such as phosphate detergents and inorganic fertilizers, to the water. These nutrients stimulate the growth of algae, which will eventually die, settle to the bottom, and decompose. Decomposition of the plant material uses up oxygen and can make water intolerable for fish and other aquatic creatures.

 

Exotic or Non-indigenous Species: These terms describe plants or animals that are not native to a specific environment but have been introduced, intentionally or inadvertently, by human activity. Sea lampreys, zebra mussels and chinook salmon are just three exotic species that are not native to the Great Lakes but are now part of its ecosystem.

 

Point-Source and Nonpoint-Source Pollution: Contaminants that come from an easily identified source, such as a sewer pipe, are known as "point-source" pollutants. Those that enter the water from less distinct sources, such as urban and agricultural runoff or atmospheric fallout, are known as "nonpoint-source" pollutants. Agricultural pesticides or fertilizers are common ingredients in nonpoint-source pollution.

 

Mass Balance: This term describes a scientific method for evaluating the sources, transport and fate of contaminants entering a water system, and the effects of those contaminants on water quality. In a mass balance budget the amounts of a contaminant that enters a river or lake--minus the quantity that is buried in sediment or otherwise stored, transformed or broken down-- must equal the amount leaving the system. Once a mass balance budget is determined for a particular pollutant, its long-term effects on water quality can be simulated by mathematical models and that information can be used to set priorities for research and remedial action.

 

Remedial Action Plans (RAPs): These plans list the specific problems in the 43 Great Lakes Areas of Concern and describe methods for correcting them. RAPs are typically compiled by a state or provincial department in charge of natural resources; then they are signed by the secretary of that department and submitted to the IJC for final approval. In 1985, the Great Lakes States and the Province of Ontario committed themselves to developing and implementing RAPs for each Area of Concern. In 1988, the Green Bay RAP compiled by the Wisconsin Department of Natural Resources was the first complete plan to be submitted to the IJC.

 

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Last updated 30 May 2003 by Wittman
© 2002 University of Wisconsin Sea Grant Institute

http://www.seagrant.wisc.edu/Communications/Publications/GLglossary/glossary.html