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Integrating Biological Data into TMDL Assessments: Refining A Model to Determine Biologically Meaningful Target Levels for Dissolved Oxygen

Quantitative models are required in order to determine target levels of DO (dissolved oxygen) that will protect pre-determined percentages of aquatic organisms. This proposal is designed to continue developing models for integrating and interpreting data derived from a newly tested rapid bioassessment technique developed for assessing Chironomidae and using them as surrogates to measure biological conditions in streams that are listed for TMDL based on reduced DO conditions. Species thermal preferenda will be developed and related to thermal patterns in stream segments that are controlled by groundwater/surface water interactions. In this project 2 stream segments from the MPCA 2 8 draft list that are all warm-water segment, are listed for reduced DO, and have TMDL start dates of 2 6, 2 7 or 2 8 will be modeled. All streams occur in the Upper Mississippi, Minnesota River, Saint Croix River or Lake Superior drainage units. These models will serve to inform decisions about target levels for DO developed in the TMDL program and are constructed to allow predictions of the percentage of species that will be protected. This modeling approach relies on relationships of daily mean temperature to equilibrium saturation DO concentrations. The utility of the model derives from the ability to pre-determine a percentage of the chironomid community that is defined as the potentially affected fraction (PAF). In this modeling approach, the PAF is the percent of the total species that could potentially be affected (or extirpated) if water temperatures exceed their individual species preferenda during their emergence periods. Once the patterns of thermal preferenda are quantified, it will be possible to identify taxa that are extirpated, but should be present based on thermal regime, and develop predictive statements about species that should re-colonize a given stream if the TMDL results in improved DO conditions. This project will enable these species to be identified, and they can then be considered as species that will be "indicators" of improving DO conditions. (Minnesota); (dissolved oxygen); (hypoxia); (hypoxic conditions); (insect); (insects); (TMDL); (total maximum daily load); (total maximum daily loads); (water quality); (non point pollution); (non- point pollution)

(Matching Funds) $48,361 USD (Estimates)

Status
In progress
Type
Project
Start Date
End Date
Scope of Study
Field Investigation
Laboratory Investigation
Scale of Phenomena
Community
Ecosystem
Landscape
Organism
Lake Basin Connecting Channels
Lake Superior
State Province
Minnesota
Annex Numbers
Pollution from Non-Point Sources
Research & Development
Annex 17
Impact of water quality and AIS on fish and wildlife populations and habitats
General
Annex
  • Annex Numbers
    Annex Numbers
    Pollution from Non-Point Sources
    Research & Development
  • Annex 17
    Annex 17
    Impact of water quality and AIS on fish and wildlife populations and habitats

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