Great Lakes Environmental Assessment and Mapping Project


A stressor is any substance, condition, flux or organisms that alters the characteristics of the lakes, including their biology, from natural or desired conditions.  A stressor may be currently operating on the lakes or may be considered likely to do so in the future.  Stressors may be physical, chemical, or biological.  Stressors may adversely affect specific aquatic plants and animals, key characteristics of natural resources, or entire ecosystems.  GLEAM focuses on adverse effects, but we recognize that some stressors can also have some positive effects.

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