Chronic Polyaromatic Hydrocarbon (PAH) Contamination Is a Marginal Driver for Community Diversity and Prokaryotic Predicted Functioning in Coastal Sediments
|Author(s)||Jeanbille Mathilde1, Gury Jerome1, Duran Robert1, Tronczynski Jacek2, Ghiglione Jean-Francois3, Agogue Helene4, Ben Said Olfa5, Taib Najwa6, Debroas Didier6, Garnier Cedric7, Auguet Jean-Christophe8|
|Affiliation(s)||1 : Univ Pau & Pays Adour, UMR 5254, CNRS, Equipe Environm & Microbiol,Inst Pluridisciplinai, Pau, France.
2 : Ifremer Ctr Atlantique, Dept Ressources Biol & Environm, Unite Biogeochim & Ecotoxicol, Lab Biogeochim Contaminants Organ, Nantes, France.
3 : Univ Paris 06, Lab Oceanog Microbienne, Univ Paris 04, CNRS,Observ Oceanol,UMR 7621, Banyuls Sur Mer, France.
4 : Univ La Rochelle, CNRS, UMR 7266, Littoral Environm & Soc, La Rochelle, France.
5 : Fac Sci Bizerte, Lab Biosurveillance Environm, Zarzouna, Tunisia.
6 : Univ Clermont Ferrand, CNRS, UMR 6023, Lab Microorganismes Genome & Environm, Aubiere, France.
7 : Univ Toulon & Var, EA 3819, Proc Transferts & Echanges Environm, La Garde, France.
8 : UMR CNRS 9190, Marine Biodivers Exploitat & Conservat, Montpellier, France.
|Source||Frontiers In Microbiology (1664-302X) (Frontiers Media Sa), 2016-08 , Vol. 7 , P. -|
|WOS© Times Cited||11|
|Keyword(s)||microbial communities, PAH, chronic contamination, coastal sediment, functional diversity|
|Abstract||Benthic microorganisms are key players in the recycling of organic matter and recalcitrant compounds such as polyaromatic hydrocarbons (PAHs) in coastal sediments. Despite their ecological importance, the response of microbial communities to chronic PAH pollution, one of the major threats to coastal ecosystems, has received very little attention. In one of the largest surveys performed so far on coastal sediments, the diversity and composition of microbial communities inhabiting both chronically contaminated and non-contaminated coastal sediments were investigated using high-throughput sequencing on the 18S and 16S rRNA genes. Prokaryotic alpha-diversity showed significant association with salinity, temperature, and organic carbon content. The effect of particle size distribution was strong on eukaryotic diversity. Similarly to alpha-diversity, beta-diversity patterns were strongly influenced by the environmental filter, while PAHs had no influence on the prokaryotic community structure and a weak impact on the eukaryotic community structure at the continental scale. However, at the regional scale, PAHs became the main driver shaping the structure of bacterial and eukaryotic communities. These patterns were not found for PICRUSt predicted prokaryotic functions, thus indicating some degree of functional redundancy. Eukaryotes presented a greater potential for their use as PAH contamination biomarkers, owing to their stronger response at both regional and continental scales.|