2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2019 | 9:30 AM - 9:45 AM | DEVELOPMENT OF A MACROINVERTEBRATE BIOLOGICAL CONDITION GRADIENT (BCG) MODEL FOR LARGE RIVERS USING HESTER-DENDY SAMPLES | 150 DEF
DEVELOPMENT OF A MACROINVERTEBRATE BIOLOGICAL CONDITION GRADIENT (BCG) MODEL FOR LARGE RIVERS USING HESTER-DENDY SAMPLES
The biological condition gradient (BCG) is a conceptual model that describes changes in aquatic communities along a gradient of increasing levels of anthropogenic stress. Biologists from Wisconsin and Minnesota participated in the development of a quantitative BCG model for large rivers, including great rivers (e.g., Mississippi River), using macroinvertebrate Hester-Dendy data. The panel of aquatic biologists calibrated the BCG model by assigning macroinvertebrate samples to BCG levels. The panelists’ criteria for assigning samples to BCG levels were recorded and used to identify quantitative rules for sample membership into each BCG level. Fuzzy set theory was then used to incorporate these rules into a model which can replicate the panelists’ decisions. The resulting BCG model can interpret biological condition of macroinvertebrate communities in large rivers of the upper Midwest along a gradient of naturalness and is constant across waterbody types and political boundaries. This attribute makes it desirable for setting consistent and protective biological criteria for macroinvertebrate assemblages in large rivers.
- Monitoring
- Invertebrate
- Bioindicators
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Presenters/Authors
R. William Bouchard, Jr.
(), Minnesota Pollution Control Agency, Will.Bouchard@state.mn.us;
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Joel Chirhart
(), Minnesota Pollution Control Agency, joel.chirhart@state.mn.us;
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Benjamin Lundeen
(), Minnesota Pollution Control Agency, benjamin.lundeen@state.mn.us;
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Jeffrey Dimick
(), University of Wisconsin-Stevens Point, jdimick@uwsp.edu;
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