| Title | Use of the MicroResp™ method to assess Pollution-Induced Community Tolerance in the context of metal soil contamination |
| Publication Type | Journal Article |
| Year of Publication | 2014 |
| Authors | Bérard A., Mazzia C., Sappin-Didier V., Capowiez L., Capowiez Y. |
| Journal | Ecological Indicators |
| Volume | 40 |
| Pagination | 27-33 |
| Date Published | May |
| Type of Article | Article |
| ISBN Number | 1470-160X |
| Accession Number | WOS:000333495500004 |
| Keywords | Biodiversity & Conservation, bioindicator, biomass, cadmium, diversity, Environmental Sciences & Ecology, forest, heavy metals, level physiological profiles, microbial communities, microbial physiological traits, microorganisms, microresp (tm), pict, pollution-induced community tolerance, respiration, soil microbial communities, substrate induced respiration, toxicity |
| Abstract | Microorganisms are known indicators of soil health, and there are already several microbial tools for assessing substance ecotoxicity, but there is still a need for practical new tools that are ecologically relevant in soil ecosystems. We developed a protocol based on the substrate-induced respiration of a soil community using the MicroResp (TM) technique as part of a Pollution-Induced Community Tolerance (PICT) approach. We tested the technique in a long-term field experiment studying the effects of sewage treatment plant discharge with high Cd and Ni contents on plants and soil. We found that MicroResp (TM) can be used in PICT-bioassays to assess heavy metal (Cd) impact to soil microbial communities. Dose-response curves for soil Cd and soil microbial glucose mineralization were obtained on microrespirometric ecotoxicological bioassays with Cd, making it possible to calculate half maximal effective concentration (EC50). EC50 values were positively correlated with Cd concentrations in soil plots. A community-level physiological profile based on mineralization of different carbon substrates was established for each soil sample. Basal respiration and microbial active biomass were estimated, and the metabolic quotient qCO(2) was calculated. These ecotoxicological and ecophysiological biomarkers converge to suggest that metal gradient is associated with sludge-impacted soil microbial communities in terms of active biomass, catabolic structure, and allocation of carbon for energy requirements versus growth in response to Cd-induced tolerance. To the best of our knowledge, this is the first study to investigate micro-SIR in a contaminated soil system as a tool for measuring microbial physiological traits and Pollution-Induced Community Tolerance. (C) 2013 Elsevier Ltd. All rights reserved.
|
| Alternate Journal | Ecol. Indic. |
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Berard, Annette Mazzia, Christophe Sappin-Didier, Valerie Capowiez, Line Capowiez, Yvan
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Bérard, A (corresponding author), INRA, EMMAH UMR1114, F-84914 Avignon, France.
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