2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/27/2021 | 2:00 PM - 3:30 PM | REDUCED RICHNESS AND UNDERLYING ENVIRONMENTAL GRADIENTS CREATE UNIQUE MACROINVERTEBRATE RESPONSES TO WATER QUALITY CHANGES IN MISSISSIPPI ALLUVIAL PLAN STREAMS | Virtual Platform
REDUCED RICHNESS AND UNDERLYING ENVIRONMENTAL GRADIENTS CREATE UNIQUE MACROINVERTEBRATE RESPONSES TO WATER QUALITY CHANGES IN MISSISSIPPI ALLUVIAL PLAN STREAMS
Mississippi Alluvial Plain (MAP) streams drain extensive agriculture and are chemically and biologically distinct from other regions of Mississippi. State water quality data showed that MAP streams have elevated alkalinity, conductivity and nutrients and lower macroinvertebrate diversity, potentially reducing the efficacy of traditional biomonitoring approaches within the region. We used threshold indicator taxa analysis (TITAN) to compare macroinvertebrate assemblage responses to water quality gradients between ecoregions in Mississippi. Individual taxa and assemblage responses occurred at higher concentrations for alkalinity, organic carbon and phosphorus but not nitrogen in MAP streams. A large proportion of indicator taxa identified were only responsive in MAP streams suggesting that assemblage responses are driven by unique taxa pools that respond to increasing degradation, but at higher levels than observed in other ecoregions. This information may be useful for setting management goals for MAP streams. However, given widespread habitat degradation within the region, these results should be compared to more sensitive biological communities (e.g., algae or bacteria) that may aid managers ability to measure ecological response to best management practices, particularly in interior MAP streams where local taxa pools may not support recovery of macroinvertebrate assemblages.
- Management
- Stressor
- Nutrients
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Presenters/Authors
Stephen DeVilbiss
(), United States Department of Agriculture - Agricultural Research Service, stephen.devilbiss@usda.gov;
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Jason Taylor
(), USDA-ARS, Jason.Taylor@usda.gov;
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Matt Hicks
(), United States Geological Survey, mhicks@usgs.gov;
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