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

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.

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Acknowledgments

This research was funded by the French program EC2CO/CNRS-INSU through the IMPEC project. Rhône River discharge data were provided by MOOSE (Mediterranean Oceanic Observing System on Environment) with the support of the “Agence de l’Eau Rhône-Méditerranée et Corse”. MB was supported by a PhD grant from the French Ministry of Research. C.M. and F.L. Aparicio received support from Ministerio de Economía y Competititvidad (DOREMI project, CTM2012-34294). The authors thank Nyree West for language improvements. We thank Ingrid Obernosterer for helpful discussions and two anonymous reviewers for their constructive comments that improved the manuscript. We are grateful to the BIO2MAR platform (http://bio2mar.obs-banyuls.fr) for providing technical support and access to instrumentation.

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Correspondence to Fabien Joux.

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Blanchet, M., Pringault, O., Panagiotopoulos, C. et al. When riverine dissolved organic matter (DOM) meets labile DOM in coastal waters: changes in bacterial community activity and composition. Aquat Sci 79, 27–43 (2017). https://doi.org/10.1007/s00027-016-0477-0

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Keywords

  • Dissolved organic matter
  • Biodegradation
  • Coastal waters
  • Bacterial community composition
  • Priming effect