Influence of pollution history on the response of coastal bacterial and nanoeukaryote communities to crude oil and biostimulation assays |
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| Institution: | 1. CNRS, UMR 7621, Laboratoire d''Océanographie Microbienne LOMIC, Avenue Fontaulé, F-66651 Banyuls-sur-Mer, France;2. UPMC Univ Paris 06, UMR 7621, Observatoire Océanologique, F-66651 Banyuls-sur-Mer, France;3. Université du Littoral Côte d''Opale, ULCO, INSU-CNRS, UMR 8187, LOG, Laboratoire d''Océanologie et des Géosciences, 32 avenue Foch, F-62930 Wimereux, France;4. Technological Educational Institute of Crete, Sitia 72300, Greece;5. Hellenic Centre for Marine Research, Institute of Oceanography, 46.7 km Athens-Sounio Avenue, 19013 Anavyssos, Greece;1. Department Estuarine and Delta Systems, Royal Netherlands Institute for Sea Research, Korringaweg 7, 4401 NT Yerseke, The Netherlands;2. Aquatic Ecophysiology and Phycology, Department of Biology, University of Hamburg, Ohnhorststraße 18, D-22609 Hamburg, Germany;1. Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland;2. Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland;3. Clinic for Swine, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland;1. Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal;2. Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal;1. Department of Chemistry, UiT – The Arctic University of Norway, Postbox 6050, Langnes, N-9037 Tromsø, Norway;2. Arctic Technology Centre, Department of Civil Engineering, Technical University of Denmark, Building 118, 2800 Lyngby, Denmark |
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| Abstract: | Pollution history has often been proposed to explain site-dependent bioremediation efficiencies, but this hypothesis has been poorly explored. Here, bacteria and their heterotrophic nanoflagellates (HNF) predators originating from pristine and chronically oil-polluted coastal sites were subjected to crude oil ± nutrients or emulsifier amendments. The addition of crude oil had a more visible effect on bacteria originating from the pristine site with a higher increase in the activity of given OTU and inactivation of other petroleum-sensitive bacteria, as revealed by DNA and RNA-based comparison. Such changes resulted in a delay in microbial growth and in a lower bacterial degradation of the more complex hydrocarbons. Biostimulation provoked a selection of different bacterial community assemblages and stirred metabolically active bacteria. This resulted in a clear increase of the peak of bacteria and their HNF predators and higher oil degradation, irrespective of the pollution history of the site. |
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