2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 11:00 AM - 11:15 AM | EVALUATING THE EFFECT OF BOTTOM DEPOSITS ON BIOLOGICAL INDICATORS FOR PROTECTING ARIZONA’S PERENNIAL STREAMS | 420 A
EVALUATING THE EFFECT OF BOTTOM DEPOSITS ON BIOLOGICAL INDICATORS FOR PROTECTING ARIZONA’S PERENNIAL STREAMS
Fine sediment aggradation in perennial stream ecosystems has a detrimental effect on biological processes that occur in interstitial spaces, such as macroinvertebrate reproduction (Waters, 1995). Reference condition streams with low percent fine sediment in stream substrate tend to have more abundant and diverse macroinvertebrates (Chapman and McLeod, 1987). For example, a study performed by the Arizona Department of Environmental Quality (ADEQ) in 2008 identified several macroinvertebrate taxa with high tolerances (Tanytarsus, Tricorythodes, and Cheumatopsyche) and low tolerances (Brachycentrus, Epeorus, Serratella, and Polycentropus) to fine sediment in substrates (Spindler, et al., 2008). In 2009, ADEQ implemented numeric “bottom deposits” water quality standards; 30% fine sediment for coldwater streams, and 50% for warmwater streams. Fine sediment was measured using modified Wolman pebble count; utilizing reachwide counts for both cold and warm regions, as per ADEQ sampling protocols (Wolman, 1954; Harrelson, et al., 1994). These water quality standards are meant to protect the Aquatic and Wildlife designated use. Our objective is to assess stream conditions and the response of macroinvertebrate bioindicators defined in previous ADEQ studies to evaluate sediment impacts on aquatic life in Arizona, and understand water quality research and policy boundaries.
- Sediment
- Monitoring
- Water Quality
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Presenters/Authors
Catherine Gullo
(), Arizona Department of Environmental Quality, cg8@azdeq.gov;
ASHA DISCLOSURE:
Financial -
Nonfinancial -