2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/06/2017  |   2:15 PM - 2:30 PM   |  DEVELOPMENT OF PROTECTIVE BIOLOGICAL THRESHOLDS FOR DIFFERENT STREAM TYPES IN A DIVERSE LANDSCAPE   |  301A

DEVELOPMENT OF PROTECTIVE BIOLOGICAL THRESHOLDS FOR DIFFERENT STREAM TYPES IN A DIVERSE LANDSCAPE

The state of Minnesota recently updated its biological assessment tools (i.e., Indices of Biotic Integrity and Biological Criteria) for streams and rivers on a statewide level. Minnesota includes a range of stream types from northern forest, cold water streams to prairie rivers. This natural diversity coupled with different stressor gradients between stream types posed challenges for developing protective and consistent biological thresholds that comply with state and federal regulations for determining attainment of beneficial uses. An important tool for establishing consistency across the state was the Biological Condition Gradient (BCG). BCG models were developed for each stream type and used to interpret changes in biological condition regardless of region or stream type. This analysis was especially important for ensuring that biological criteria are protective in regions where widespread disturbance is present (e.g., prairie region). The BCG models were also integral to the development of Minnesota's tiered goals as part of tiered aquatic life uses (TALU) framework.

  • C17 Bioassessment
  • C36 Water Resource Management
  • S27 Advancing Consistency in Ecological Assessments

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Presenters/Authors

R. William Bouchard, Jr. (), Minnesota Pollution Control Agency, Will.Bouchard@state.mn.us;


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Susan Jackson (), U.S. Environmental Protection Agency, Jackson.Susank@epa.gov;


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