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Following the impact of metals on river sediments in microcosms: metals as a community manager
Cyriaque, Valentine; Géron, Augustin; Gillan, David et al.
201817th International Symposium on Microbial Ecology (ISME17)
 

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Abstract :
[en] Metal contamination of soil and sediments is a serious environmental issue as metals cannot be degraded. Despite elevated metal concentrations, river sedimentary microbial communities near the MetalEurop foundry (Northern France) display an unexpected high diversity in comparison with an upstream control site (Férin). Recent methodological improvements of 16S rRNA taxonomy profiling has enhanced analytical accuracy and revealed that metals act as drivers of the microbial community structure. In the present study, a follow-up of the evolution of sediment microbial communities sampled in Férin sediments was performed in microcosms with a periodic renewal of the supernatant water. Experimental microcosms were progressively exposed to a mixture of metals to finally reach concentrations observed in MetalEurop: Cd (38.1 mg/kg), Cu (100.0 mg/kg), Pb (913.8 mg/kg) and Zn (3218.5 mg/kg). Microcosms were followed using 16S rRNA gene Illumina sequencing. Functional insights on metal resistance were obtained by quantitative PCR targeting czcA and pbrA genes coding for metal efflux pumps. The broad host range incP plasmid content was also followed by quantitative PCR. Interestingly, taxonomical analyses revealed a higher specific richness and equitability in metal-contaminated microcosms. This increase can be explained by metals acting as a community-manager together with community coalescence (i.e., the gathering of two different microbial communities). Quantitative PCR analysis coupled with taxonomic evolution suggest a step by step adaptation through the selection of different metal-resistance mechanisms.
Disciplines :
Environmental sciences & ecology
Phytobiology (plant sciences, forestry, mycology...)
Zoology
Author, co-author :
Cyriaque, Valentine ;  Université de Mons > Faculté des Sciences > Protéomie et Microbiologie
Géron, Augustin
Gillan, David ;  Université de Mons > Faculté des Sciences > Service de Protéomie et Microbiologie
Wattiez, Ruddy  ;  Université de Mons > Faculté des Sciences > Service de Protéomie et Microbiologie
Language :
English
Title :
Following the impact of metals on river sediments in microcosms: metals as a community manager
Publication date :
13 August 2018
Number of pages :
1
Event name :
17th International Symposium on Microbial Ecology (ISME17)
Event place :
Leipzig, Germany
Event date :
2018
Research unit :
S828 - Protéomie et Microbiologie
Research institute :
R100 - Institut des Biosciences
Name of the research project :
"Plasticity of synthetic and natural microbial communities in a heavy metal stressed environment_x000D_ " - Fédération Wallonie Bruxelles
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since 11 January 2019

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