2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 3:00 PM - 3:15 PM | MESOCOSM EXPERIMENTS CONDUCTED WITH METAL MIXTURES OFTEN REVEAL ECOLOGICAL SURPRISES | 330 A
MESOCOSM EXPERIMENTS CONDUCTED WITH METAL MIXTURES OFTEN REVEAL ECOLOGICAL SURPRISES
Predicting fate and effects of chemical mixtures on aquatic organisms is complicated by our relatively poor understanding of contaminant interactions and our inability to quantify effects on ecologically meaningful endpoints. Mesocosm experiments using natural communities provide an opportunity to assess these direct and interactive effects. Over the past 25 years we have focused much of our research on assessing responses of benthic communities to metal mixtures associated with historical mining activities. Because these mixtures often include metals that cause both toxicological (Cd, Cu and Zn) and physical (Fe hydroxide deposition) effects, mesocosm experiments were necessary to quantify responses. We conducted a meta-analysis of 30 mesocosm experiments conducted with macroinvertebrate communities collected from 8 different streams to quantify the effects of metal combination, community source and season on responses to metal mixtures. Depending on the specific metal combination, results showed both synergistic and antagonistic effects. Sensitivity of macroinvertebrate communities to metals also varied among seasons and was influenced by community source, demonstrating the context-dependent nature of these responses. These results could help explain the vast discrepancies between laboratory and field responses to metals often reported in the literature.
- Ecotoxicology
- Mesocosm
- Biological Criteria
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Presenters/Authors
William Clements
(), Colorado State University, william.clements@colostate.edu;
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Christopher Kotalik
(), Colorado State University, cjkotalik@gmail.com;
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Brian Wolff
(), Colorado State University, wolffba@gmail.com;
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Pete Cadmus
(), Colorado Parks and Wildlife, pete.cadmus@state.co.us;
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