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?.
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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).