Aquatic Sciences

, Volume 79, Issue 1, pp 27–43

When riverine dissolved organic matter (DOM) meets labile DOM in coastal waters: changes in bacterial community activity and composition

  • Marine Blanchet
  • Olivier Pringault
  • Christos Panagiotopoulos
  • Dominique Lefèvre
  • Bruno Charrière
  • Jean-François Ghiglione
  • Camila Fernandez
  • Fran L. Aparicio
  • Cèlia Marrasé
  • Philippe Catala
  • Louise Oriol
  • Jocelyne Caparros
  • Fabien Joux
Research Article

DOI: 10.1007/s00027-016-0477-0

Cite this article as:
Blanchet, M., Pringault, O., Panagiotopoulos, C. et al. Aquat Sci (2017) 79: 27. doi:10.1007/s00027-016-0477-0

Abstract

Heterotrophic bacterial communities in marine environments are exposed to a heterogeneous mixture of dissolved organic compounds with different bioreactivity that may control both their activity and composition. The coastal environment is an example of a mixing area where recalcitrant allochthonous organic matter from rivers can encounter labile organic matter from marine phytoplanktonic blooms. The objective of this study was to explore the effects of mixed qualities of dissolved organic matter (DOM) on bacterial community activity (BCA) and bacterial community composition (BCC) and to test for a priming effect when DOM sources are added in combination. Coastal marine bacterial communities were incubated separately with a mixture of amino acids and with natural riverine DOM or with both sources together for 42 days. Addition of amino acids alone or in combination with riverine DOM led to a similar stimulation of BCA compared to control condition, whereas addition of riverine DOM alone did not modify BCA compared to the control. On the contrary, BCC analyzed by 16S rRNA gene pyrosequencing was not affected by the addition of amino acids alone, but changed dramatically with riverine DOM alone or in combination with amino acids. Our results show that changes in BCA and BCC can be driven by different types of DOM, but that these changes are not necessarily coupled. Moreover, the addition of labile DOM did not modify the microbial decomposition of riverine DOM, nor the BCC, suggesting that a priming effect did not occur under these experimental conditions.

Keywords

Dissolved organic matter Biodegradation Coastal waters Bacterial community composition Priming effect 

Supplementary material

27_2016_477_MOESM1_ESM.pptx (5.1 mb)
Supplementary material 1 (PPTX 5270 kb)

Copyright information

© Springer International Publishing 2016

Authors and Affiliations

  • Marine Blanchet
    • 1
  • Olivier Pringault
    • 2
  • Christos Panagiotopoulos
    • 3
  • Dominique Lefèvre
    • 3
  • Bruno Charrière
    • 3
    • 5
  • Jean-François Ghiglione
    • 1
  • Camila Fernandez
    • 1
  • Fran L. Aparicio
    • 4
  • Cèlia Marrasé
    • 4
  • Philippe Catala
    • 1
  • Louise Oriol
    • 1
  • Jocelyne Caparros
    • 1
  • Fabien Joux
    • 1
  1. 1.Laboratoire d’Océanographie Microbienne (LOMIC), Observatoire OcéanologiqueSorbonne Universités, UPMC Univ Paris 06, CNRSBanyuls/MerFrance
  2. 2.UMR5119 Ecologie des systèmes marins côtiers (ECOSYM), CNRS, IRD, UM2, UM1Université Sciences et Techniques du Languedoc Montpellier 2Montpellier Cedex 5France
  3. 3.Aix Marseille Université, Mediterranean Institute of Oceanography (MIO), Université du Sud-Toulon-Var, 83587, CNRS-INSU/IRD UM 110Marseille Cedex 09France
  4. 4.Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37BarcelonaSpain
  5. 5.Centre de Formation et de Recherche sur l’Environnement Méditerranéen (CEFREM, UMR CNRS 5110), Bât. U, Université de PerpignanPerpignanFrance

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