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Microbial diversity and activity assessment in a 100-year-old lead mine

Abstract : Mining activities frequently leave a legacy of residues that remain in the area for long periods causing the pollution of surroundings. We studied on a 100 year-old mine, the behavior of potentially toxic elements (PTEs) and their ecotoxicological impact on activity and diversity of microorganisms. The PTEs contamination assessment allowed the classification of the materials as highly (reference- and contaminated-samples) and very highly polluted (illegal spill of olive mill wastes (OMW), tailings, and dumps). OMW presented the lowest enzymatic activities while tailings and dumps had low dehydrogenase and arylsulfatase activities. All the beta-diversity indices studied were negatively impacted in dumps. Tailings had lower Chao1 and PD whole tree values as compared to those of reference-samples. beta-diversity analysis showed similar bacterial community composition for referenceand contaminated-samples, significantly differing from that of tailings and dumps. The relative abundance of Gemmatimonadetes, Bacteroidetes, and Verrucomicrobia was lower in OMW, tailings, and dumps as compared to reference-samples. Fifty-seven operational taxonomic units were selected as responsible for the changes observed between samples. This study highlights that assessing the relationship between physicochemical properties and microbial diversity and activity gives clues about ongoing regulating processes that can be helpful for stakeholders to define an appropriate management strategy.
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https://hal.inrae.fr/hal-03310791
Contributor : Noureddine El Mjiyad <>
Submitted on : Friday, July 30, 2021 - 4:28:52 PM
Last modification on : Saturday, July 31, 2021 - 3:52:54 AM

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Sara Gallego, José María Esbrí, Juan Antonio Campos, Jesús Daniel Peco, Fabrice Martin-Laurent, et al.. Microbial diversity and activity assessment in a 100-year-old lead mine. Journal of Hazardous Materials, Elsevier, 2021, 410, pp.124618. ⟨10.1016/j.jhazmat.2020.124618⟩. ⟨hal-03310791⟩

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