Davies, S., Jackson,S. 2006. The Biological Condition Gradient: A Descriptive Model for Interpreting Change in Aquatic Ecosystems. Ecological Applications. The Ecological Society of America, Ithaca, NY. Volume 16, Number 4. Page 1251.

Assessment, biological, impacts, Management, Model

The Biological Condition Gradient (BCG) is a descriptive model that describes how ten ecological attributes change in response to increasing levels of stressors. The gradient of biological condition is divided into six tiers useful to water quality scientists and managers. This nationally applicable model helps assess aquatic resources more uniformly and directly between states.