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Marine Biology

, Volume 151, Issue 1, pp 41–52 | Cite as

Seasonal variability of intertidal bacterial metabolism and growth efficiency in an exposed sandy beach during low tide

  • Cédric Hubas
  • Dominique Lamy
  • Luis Felipe Artigas
  • Dominique Davoult
Research Article

Abstract

Benthic gross primary production (GPP) and community respiration (BCR) were regularly measured on sandy beach sediment during low tide in a megatidal ecosystem. These measurements were assessed during 2 years in situ within a benthic chamber simultaneously with bacterial production (BP). Results suggested that community respiration in Wimereux sandy beach sediments was probably dominated by bacterial respiration and that the estimated benthic bacterial growth efficiency (BGE) was highly variable. Although temperature significantly controlled both BP and BCR during low tide at the annual scale, the temperature effect on BGE was not significant. The instability and sediment erosion caused by the wave action and the tidal cycle were thus thought to influence the BGE. Since the sampling site is regularly affected by Phaeocystis foam deposit (enhancing the BCR and decreasing the BGE), and since GPP rates were highly variable and supported by high assimilation numbers (i.e., >1 mgC mgChla−1 h−1), phytoplankton organic matter deposit following the immersion of the study site was thought to explain the BGE variability.

Keywords

Bacterial Community Gross Primary Production Bacterial Production Bacterial Biomass Sandy Beach 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank anonymous reviewers for improving the manuscript. This work was part of both a regional and a national program: the Contrat Plan Etat-Région (CPER) - Bloom de Phaeocystis supported by the Regional (Nord-Pas de Calais) Research Council and the FEDER, and the Programme National d’Environnement Côtier: Chantier PNEC - Manche Orientale - Sud Mer du Nord. C. Hubas benefited of a Ministry of Research and Technology (MRT) PhD grant and D. Lamy was supported by a Regional (Nord - Pas de Calais) Ph.D grant and the Agence de l’Eau Artois-Picardie (contract n° 03 13 00 70).

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Cédric Hubas
    • 1
    • 2
  • Dominique Lamy
    • 1
  • Luis Felipe Artigas
    • 1
  • Dominique Davoult
    • 2
  1. 1.FRE 2816Université du Littoral Côte d’Opale, Maison de la Recherche en Environnement NaturelDunkerque CedexFrance
  2. 2.UMR 7144 AD2MUniversité Pierre et Marie Curie-Paris6, Station Biologique de RoscoffRoscoffFrance

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