2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 12:00 PM - 12:15 PM | TRACE ELEMENT ACCUMULATION IN DRAGONFLY NYMPHS AND CRAYFISH AS INDICATORS OF CONSTRUCTED WETLAND EFFECTIVENESS | 305B
TRACE ELEMENT ACCUMULATION IN DRAGONFLY NYMPHS AND CRAYFISH AS INDICATORS OF CONSTRUCTED WETLAND EFFECTIVENESS
The H-02 wetland system was constructed to regulate pH and remove trace metals, particularly Cu and Zn, from an effluent line on the Department of Energy’s Savannah River Site. Six dragonfly nymph genera were used as a biomonitors of bioavailable contaminants throughout the wetland system and two reference wetlands. Crayfish from the receiving stream were also analyzed. Concentrations of 15 elements were evaluated in over 600 whole-body composite samples. Element accumulation varied more among than within genera, suggesting genus to be a reasonable taxonomic level for both spatial and taxonomic comparisons. Spatial variability in trace element accumulation differed among genera. Genera more closely associated with sediments generally accumulated higher contaminant concentrations. Nymph Cu and Zn concentrations in the constructed wetland sites were often elevated above those from reference wetlands. Overall, element accumulation did not follow the expected contamination gradient based on water concentrations throughout the system. Some contaminants accumulated to similar levels above and below the treatment wetlands. Despite reducing water concentrations at base flow discharge, biologically available contaminants are passing though the wetlands. Potential causative factors were identified.
- S04 Natural and Constructed Wetlands – improving water quality and watershed health
- C13 Ecotoxicology
- S03 Stressing the 'Eco' in Freshwater Ecotoxicology
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Presenters/Authors
Dean Fletcher
(), Savannah River Ecology Laboratory-University of Georgia, fletcher@srel.uga.edu;
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Angela Lindell
(), Savannah River Ecology Laboratory-University of Georgia, lindell@srel.uga.edu;
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Paul Stankus
(), Savannah River Ecology Laboratory-University of Georgia, stankus@srel.uga.edu;
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Gary Mills
(), Savannah River Ecology Laboratory-University of Georgia, gmills@srel.uga.edu;
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Danielle Pitt
(), Savannah River Ecology Laboratory-University of Georgia, dbpitt@uga.edu;
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