Response of Core Microbial Consortia to Chronic Hydrocarbon Contaminations in Coastal Sediment Habitats
|Author(s)||Jeanbille Mathilde1, Gury Jerome1, Duran Robert1, Tronczynski Jacek2, Agogue Helene3, Ben Said Olfa1, 4, Ghiglione Jean-Francois5, Auguet Jean-Christophe6|
|Affiliation(s)||1 : Univ Pau & Pays Adour, Equipe Environm & Microbiol, Inst Pluridisciplinaire Rech Environm & Mat, CNRS,UMR 5254, Pau, France.
2 : IFREMER, Ctr Atlantique, Dept Ressources Biol & Environm, Lab Biogeochim Contaminants Organ,Unite Biogeochi, Nantes, France.
3 : Univ La Rochelle, CNRS, UMR 7266, Littoral Environm & Soc, La Rochelle, France.
4 : Fac Sci Bizerte, Lab Biosurveillance Environm, Zarzouna, Tunisia.
5 : Univ Paris 06, CNRS, UMR 7621, Lab Oceanog Microbienne,Sorbonne Univ, Banyuls Sur Mer, France.
6 : CNRS, UMR 9190, Marine Biodivers Exploitat & Conservat, Montpellier, France.
|Source||Frontiers In Microbiology (1664-302X) (Frontiers Media Sa), 2016-10 , Vol. 7 , N. 1637 , P. 1-13|
|WOS© Times Cited||20|
|Note||This article was submitted to Systems Microbiology, a section of the journal Frontiers in Microbiology|
|Keyword(s)||co-occurrence network, core community, microbial consortia, PAH, chronic contamination, coastal sediment|
|Abstract||Traditionally, microbial surveys investigating the effect of chronic anthropogenic pressure such as polyaromatic hydrocarbons (PAHs) contaminations consider just the alpha and beta diversity and ignore the interactions among the different taxa forming the microbial community. Here, we investigated the ecological relationships between the three domains of life (i.e., Bacteria, Archaea, and Eukarya) using 454 pyrosequencing on the 16S rRNA and 18S rRNA genes from chronically impacted and pristine sediments, along the coasts of the Mediterranean Sea (Gulf of Lion, Vermillion coast, Corsica, Bizerte lagoon and Lebanon) and the French Atlantic Ocean (Bay of Biscay and English Channel). Our approach provided a robust ecological framework for the partition of the taxa abundance distribution into 859 core Operational taxonomic units (OTUs) and 6629 satellite OTUs. OTUs forming the core microbial community showed the highest sensitivity to changes in environmental and contaminant variations, with salinity, latitude, temperature, particle size distribution, total organic carbon (TOC) and PAH concentrations as main drivers of community assembly. The core communities were dominated by Gammaproteobacteria and Deltaproteobacteria for Bacteria, by Thaumarchaeota, Bathyarchaeota and Thermoplasmata for Archaea and Metazoa and Dinoflagellata for Eukarya. In order to find associations among microorganisms, we generated a co-occurrence network in which PAHs were found to impact significantly the potential predator – prey relationship in one microbial consortium composed of ciliates and Actinobacteria. Comparison of network topological properties between contaminated and non-contaminated samples showed substantial differences in the network structure and indicated a higher vulnerability to environmental perturbations in the contaminated sediments.|