Abstract
1H NMR metabolomics was used to measure earthworm sub-lethal responses to polychlorinated biphenyls (PCBs) in historically contaminated (>30 years) soils (91–280 mg/kg Aroclor 1254/1260) after two and 14 days of exposure. Although our previous research detected a distinct earthworm metabolic response to PCBs in freshly spiked soil at lower concentrations (0.5–25 mg/kg Aroclor 1254), the results of this study suggest only weak or non-significant relationships between earthworm metabolic profiles and soil PCB concentrations. This concurs with the expectation that decades of contaminant aging have likely decreased PCB bioavailability and toxicity in the field. Instead of being influenced by soil contaminant concentration, earthworm metabolic profiles were more closely correlated to soil properties such as total soil carbon and soil inorganic carbon. Overall, these results suggested that 1H NMR metabolomics may be capable of detecting both site specific responses and decreased contaminant bioavailability to earthworms after only two days of exposure, whereas traditional toxicity tests require much more time (e.g. 14 days for acute toxicity and >50 days for reproduction tests). Therefore, there is significant opportunity to develop earthworm metabolomics as a sensitive tool for rapid assessment of the toxicity associated with contaminated field soils.
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Acknowledgments
We gratefully acknowledge funding for this research from the Natural Science and Engineering Research Council (NSERC) of Canada in the form of Strategic and Discovery Grants to MJS. We also thank Dr. Jennifer McKelvie, Brian Lankadurai, and Jimmy Yuk for valuable discussions.
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Whitfield Åslund, M., Simpson, M.J., Simpson, A.J. et al. Earthworm metabolomic responses after exposure to aged PCB contaminated soils. Ecotoxicology 21, 1947–1956 (2012). https://doi.org/10.1007/s10646-012-0928-x
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DOI: https://doi.org/10.1007/s10646-012-0928-x