Understanding Index of Biotic Integrity (IBI) for River Health Assessment

Jun 16, 2025

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Learn about Karr's Index of Biotic Integrity (IBI) for rivers, assessing biological conditions and integrity of ecosystems. Explore the concept of biological integrity and its importance in maintaining a balanced ecosystem.

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Understanding Index of Biotic Integrity (IBI) for River Health Assessment

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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).