2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 11:45 AM - 12:00 PM | HYPOLIMNETIC TAILWATERS AS REFUGES FOR NUISANCE AND INVASIVE SPECIES: A CASE STUDY OF DIDYMOSPHENIA GEMINATA EFFECTS ON AQUATIC MACROINVERTEBRATES | 254 B
HYPOLIMNETIC TAILWATERS AS REFUGES FOR NUISANCE AND INVASIVE SPECIES: A CASE STUDY OF DIDYMOSPHENIA GEMINATA EFFECTS ON AQUATIC MACROINVERTEBRATES
Didymosphenia geminata, a diatom that has been introduced to, and proliferated within, low temperature tailwater stream systems worldwide, alters benthic habitat and community structure. Associations between macroinvertebrate communities and D. geminata biomass in riffle and run mesohabitats were investigated at three tailwater sites and one non-tailwater control site in the South Holston River, Tennessee, USA. Didymosphenia geminata biomass was significantly higher in run mesohabitats compared to riffle mesohabitats. Macroinvertebrate diversity was correlated with flow rate, temperature, specific conductance, turbidity, and D. geminata biomass. The relative abundance of most benthic taxa and D. geminata differed significantly among riffle and run mesohabitats. Ephemeropterans, plecopterans, trichopterans, amphipods and coleopterans were more abundant in riffle mesohabitats than in run mesohabitats, whereas oligochaetes, turbellarians, isopods, and chironomids dominated run mesohabitats with high D. geminata biomass. Both D. geminata and macroinvertebrates responded similarly to flow rate, DO, specific conductance, and turbidity habitat parameters in tailwater reaches. Our research suggests that tailwater management practices should consider combining increased frequencies of high discharge pulses to dislodge D. geminata mats with low-discharge pulses to increase water temperatures. These management practices may prove effective at reducing algal standing crop.
- Dams
- Invertebrate
- Invasives
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Presenters/Authors
Matthew Green
(), Clemson University , mwgreen@g.clemson.edu;
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Shea Tuberty
(), Appalachian State University, tubertysr@appstate.edu ;
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Peter Blum
(), The University of North Carolina at Greensboro, pwblum@uncg.edu;
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Stephanie Sellers
(), Appalachian State University, sellerssc@appstate.edu ;
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Michael Gangloff
(), Appalachian State University, gangloffmm@appstate.edu ;
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Luke Jacobus
(), Indiana University-Purdue University Columbus, lmjacobu@iupuc.edu;
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