2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/23/2018 | 9:00 AM - 9:15 AM | COMPARING RELATIVE SENSITIVITIES OF AQUATIC INSECTS TO TRACE METAL EXPOSURE IN FIELD STUDIES AND SHORT-TERM STREAM MESOCOSM EXPERIMENTS | 410 B
COMPARING RELATIVE SENSITIVITIES OF AQUATIC INSECTS TO TRACE METAL EXPOSURE IN FIELD STUDIES AND SHORT-TERM STREAM MESOCOSM EXPERIMENTS
Characterizing macroinvertebrate taxa as either sensitive or tolerant is of critical importance for investigating impacts of anthropogenic stressors in aquatic ecosystems and for inferring causality. However, our understanding of relative sensitivity of aquatic insects to metals in the field and under controlled conditions in the laboratory or mesocosm experiments is limited. In this study, we compared the response of 16 lotic macroinvertebrate families to metals in short term (10-day) stream mesocosm experiments and in a spatially extensive field survey of Colorado streams. Comparisons of field and mesocosm-derived EC20s (effect concentrations of 20%) showed that aquatic insects were generally more sensitive to metals in the field. Although the ranked sensitivity to metals was similar for most families, we observed large differences between field and mesocosm responses for some groups (e.g., Baetidae and Heptageniidae). These differences most likely resulted from the inability of short-term experiments to account for factors such as dietary exposure to metals, rapid recolonization in the field and effects of metals on sensitive life stages. Understanding mechanisms responsible for differences among field, mesocosm and laboratory approaches would improve our ability to predict contaminant effects on aquatic communities.
- Bioindicators
- Metal
- Ecotoxicology
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Presenters/Authors
Yuichi Iwasaki
(), National Institute of Advanced Industrial Science and Technology, Japan, yuichiwsk@gmail.com;
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Travis S. Schmidt
(), U.S. Geological Survey, Helena, MT 59601, tschmidt@usgs.gov;
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William Clements
(), Colorado State University, William.Clements@colostate.edu ;
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