Abstract
We evaluated the relative impact of anthropogenic polycyclic aromatic hydrocarbons (PAHs) among biogeochemical variables on total, metabolically active, and PAH bacterial communities in summer and winter in surface microlayer (SML) and subsurface seawaters (SSW) across short transects along the NW Mediterranean coast from three harbors, one wastewater effluent, and one nearshore observatory reference site. At both seasons, significant correlations were found between dissolved total PAH concentrations and PAH-degrading bacteria that formed a gradient from the shore to nearshore waters. Accumulation of PAH degraders was particularly high in the SML, where PAHs accumulated. Harbors and wastewater outfalls influenced drastically and in a different way the total and active bacterial community structure, but they only impacted the communities from the nearshore zone (<2 km from the shore). By using direct multivariate statistical analysis, we confirmed the significant effect of PAH concentrations on the spatial and temporal dynamic of total and active communities in this area, but this effect was putted in perspective by the importance of other biogeochemical variables.
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Acknowledgments
We are grateful to the crew and officials of R/V Antédon II, as well as the Service d’Observation of the MIO, and especially Aria Carame and Mpavjs Guigui for their excellent cooperation. This study is part of a research project “IBISCUS” (Indicateurs Biologiques et chImiques de Contaminations UrbaineS) from Université Aix-Marseille2/CNRS-INSU, which aims at developing observation tools for pollution assessment in urban coastal marine environment and funded by (1) the Continental and Coastal Ecosphere (EC2CO) program from CNRS and the Institut des Sciences de l’Univers (INSU) and (2) “ANR-ECOTECH 09-ECOT-009-01,” Agence Nationale de la Recherche (ANR)—Ademe/Ecotechnologies program, both labeled by the Competitivity Cluster “Pôle Mer PACA.”
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The authors declare that they have no competing interests.
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Sauret, C., Tedetti, M., Guigue, C. et al. Influence of PAHs among other coastal environmental variables on total and PAH-degrading bacterial communities. Environ Sci Pollut Res 23, 4242–4256 (2016). https://doi.org/10.1007/s11356-015-4768-0
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DOI: https://doi.org/10.1007/s11356-015-4768-0