2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 9:45 AM - 10:00 AM | COMMUNITY RESPONSES TO DIRECT AND INDIRECT EFFECTS OF METALS STRESSORS USING STREAM MESOCOSMS | 305B
COMMUNITY RESPONSES TO DIRECT AND INDIRECT EFFECTS OF METALS STRESSORS USING STREAM MESOCOSMS
The ecological effects of trace metals on streams and rivers are well documented through laboratory, field, and mesocosm approaches. While most water quality criteria (WQC) are developed using traditional laboratory toxicity tests, mesocosm experiments offer a valuable middle ground between laboratory methods and field surveys. We evaluated the direct and indirect effects of metals by exposing benthic communities to Cu and Zn mixtures and Fe oxide for 14 d. Measured responses included the timing and abundance of emerging adult taxa, algal colonization, community metabolism, and community composition. Results of both mesocosm experiments show differences in larval and adult responses within the same taxonomic groups, particularly among midges (Chironomidae) and mayflies (Ephemeroptera); however, algal colonization and community metabolism displayed the greatest sensitivity to exposure. In general, significant responses were observed at concentrations below the WQC for Fe, whereas observed effects for Cu and Zn occurred at or above their reported toxic concentrations. This research demonstrates the usefulness of mesocosms experiments for assessing effects of different environmental stressors, while highlighting the need to comprehensively assess contaminant effects with ecologically meaningful endpoints.
- S03 Stressing the 'Eco' in Freshwater Ecotoxicology
- C13 Ecotoxicology
- S25 Do mesocosm experiments play a meaningful role in freshwater research
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Presenters/Authors
Christopher Kotalik
(), Colorado State University, cjkotalik@gmail.com;
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William Clements
(), Colorado State University, William.Clements@colostate.edu ;
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Pete Cadmus
(), Colorado Parks and Wildlife, pete.cadmus@state.co.us;
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