Microbial Ecology

, Volume 35, Issue 1, pp 83–93

The Microbial Loop at the Surface of a Peatland:Structure, Function, and Impact of Nutrient Input

  • D.  Gilbert
  • C.  Amblard
  • G.  Bourdier
  • A.-J.  Francez

DOI: 10.1007/s002489900062

Cite this article as:
Gilbert, D., Amblard, C., Bourdier, G. et al. Microb Ecol (1998) 35: 83. doi:10.1007/s002489900062
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Abstract

The aim of this study was to assess the structure and function of the microbial loop in a peatland of the French Massif central, and the impact of fertilization on the different microbial communities.

In terms of biomass, testate Amoeba (48% of the total microbial biomass), heterotrophic bacteria (15%), cyanobacteria (14%) and Bacillariophyceae (13%) were the dominant groups of microorganisms. Other microalgae (7%), ciliates (2%) and heterotrophic flagellates (1%) accounted for only a low proportion of total microbial biomass. The relative importance of heterotrophic microorganisms was higher than in marine or lacustrine environments. In addition, ciliates and heterotrophic flagellates only constituted a small proportion of the total protozoan biomass, which was heavily dominated by testate amoeba. Thus, the structure of the protist community in the subaquatic peatland was completely different from that reported for lakes or marine environments.

In other aspects, the supply of nutrients (PKCa and NPKCa) resulted in increases of the relative biomasses of heterotrophic bacteria, Bacillariophyceae, and ciliates and by a decrease in the relative proportion of testate amoeba and of other microalgae.

Copyright information

© 1998 Springer-Verlag New York Inc.

Authors and Affiliations

  • D.  Gilbert
    • 1
  • C.  Amblard
    • 1
  • G.  Bourdier
    • 1
  • A.-J.  Francez
    • 2
  1. 1.Laboratoire de Biologie Comparée des Protistes, URA CNRS 1944, Université Blaise Pascal Clermont-Ferrand II, 63177 Aubière cedex, FranceFR
  2. 2.Laboratoire d'Ecologie végétale, UMR CNRS ``Ecobio,'' Université de Rennes-I, Complexe scientifique de Beaulieu, 35042 Rennes cedex, FranceFR

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