US Army Corps of Engineers
Portland District Website Website

Index of Biological Integrity

The IBI concept was developed for flowing streams, but has been applied to estuarine systems. The index includes values for metrics (e.g., abundance of fish species). The index for a site is compared with an index for reference sites. It is often used to evaluate the level of disturbance at a site based on the abundances of a selected group of species.

Contact information

Ronald Thom, Ph.D

Marine Research Operations, PNNL
1529 W. Sequim Bay Rd.
Sequim, WA 98382