Ecological Research

, Volume 23, Issue 5, pp 851–861

Short-term variations in abundances and potential activities of viruses, bacteria and nanoprotists in Lake Bourget

  • T. Sime-Ngando
  • J. Colombet
  • S. Personnic
  • I. Domaizon
  • U. Dorigo
  • P. Perney
  • J. C. Hustache
  • E. Viollier
  • S. Jacquet
Original Article

DOI: 10.1007/s11284-007-0448-y

Cite this article as:
Sime-Ngando, T., Colombet, J., Personnic, S. et al. Ecol Res (2008) 23: 851. doi:10.1007/s11284-007-0448-y

Abstract

Samples were collected at four depths every 6 h over a 42-h period during two contrasting seasons (June vs. December) from Lake Bourget, France, for evidence of circadian fluctuations in the concentrations and potential activities of viruses, prokaryotes and protists in relation to environmental conditions: temperature, chlorophyll a and dissolved organic carbon (DOC) concentrations. Considerable vertical and temporal fluctuations were observed for all variables. Circadian variations were noted for DOC and chlorophyll a concentrations. Despite the external abiotic forcing (light, water movements), the fluctuations of microbial variables (including viruses) in most cases were apparently linked to biotic factors and interactions. Standing stocks and activities, as well as the number and levels of correlations among the microbial components, were, surprisingly, higher in winter than in summer. We speculate that this was because trophic interactions prevailed over the seasonal forcing (i.e. temperature) in shaping the observed differences.

Keywords

Lakes Diurnal cycles Viruses Virioplankton Bacteria Protists 

Copyright information

© The Ecological Society of Japan 2007

Authors and Affiliations

  • T. Sime-Ngando
    • 1
  • J. Colombet
    • 1
  • S. Personnic
    • 2
  • I. Domaizon
    • 3
  • U. Dorigo
    • 2
  • P. Perney
    • 2
  • J. C. Hustache
    • 2
  • E. Viollier
    • 4
  • S. Jacquet
    • 2
  1. 1.UMR CNRS 6023, Biologie des ProtistesUniversité Blaise PascalAubière CedexFrance
  2. 2.UMR CARRTEL, Station INRA d’Hydrobiologie LacustreThonon CedexFrance
  3. 3.Université de SavoieLe Bourget du Lac CedexFrance
  4. 4.UMR CNRS 7047, Géochimie des EauxUniversité Paris 7 et IPGPParis Cedex 05France

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