The Leaf Pack Network is an initiative of Stroud™ Water Research Center. The Stroud Center seeks to advance knowledge and stewardship of freshwater systems through global research, education, and watershed restoration.

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Biotic Index Calculator

The Pollution Tolerance Index Score and Pollution Tolerance Index Rating calculated here and used in the Leaf Pack Stream Ecology Kit were created at Stroud Water Research Center from a select subset of biotic indices from across the United States. Please contact us if you have questions about the calculator.