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IBI
What is it?
• Karr (1981) developed an Index of Biotic
Integrity (IBI) to evaluate biological
conditions of rivers and streams – primarily
in the mid-west.
What is biological integrity?
• The ability to support and to maintain a
balanced, integrated, adaptive community
of organisms having a species composition,
diversity, and functional organization
comparable to that of the natural habitat of
the region (Karr and Dudley 1981).