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Applied and Environmental Microbiology, October 2005, p. 5935-5942, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.5935-5942.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Genetic Diversity of Small Eukaryotes in Lakes Differing by Their Trophic Status

Marie Lefranc, Aurélie Thénot, Cécile Lepère, and Didier Debroas*

Université Blaise Pascal, Laboratoire de Biologie des Protistes UMR CNRS 6023, 63177 Aubière cedex, France

Received 1 December 2004/ Accepted 10 May 2005

Small eukaryotes, cells with a diameter of less than 5 µm, are fundamental components of lacustrine planktonic systems. In this study, small-eukaryote diversity was determined by sequencing cloned 18S rRNA genes in three libraries from lakes of differing trophic status in the Massif Central, France: the oligotrophic Lake Godivelle, the oligomesotrophic Lake Pavin, and the eutrophic Lake Aydat. This analysis shows that the least diversified library was in the eutrophic lake (12 operational taxonomic units [OTUs]) and the most diversified was in the oligomesotrophic lake (26 OTUs). Certain groups were present in at least two ecosystems, while the others were specific to one lake on the sampling date. Cryptophyta, Chrysophyceae, and the strictly heterotrophic eukaryotes, Ciliophora and fungi, were identified in the three libraries. Among the small eukaryotes found only in two lakes, Choanoflagellida and environmental sequences (LKM11) were not detected in the eutrophic system whereas Cercozoa were confined to the oligomesotrophic and eutrophic lakes. Three OTUs, linked to the Perkinsozoa, were detected only in the Aydat library, where they represented 60% of the clones of the library. Chlorophyta and Haptophyta lineages were represented by a single clone and were present only in Godivelle and Pavin, respectively. Of the 127 clones studied, classical pigmented organisms (autotrophs and mixotrophs) represented only a low proportion regardless of the library's origin. This study shows that the small-eukaryote community composition may differ as a function of trophic status; certain lineages could be detected only in a single ecosystem.

* Corresponding author. Mailing address: Université Blaise Pascal, Laboratoire de Biologie des Protistes UMR CNRS 6023, 63177 Aubière cedex, France. Phone: 33 473 407837. Fax: 33 473 4077837. E-mail: didier.debroas{at}free.fr.

Applied and Environmental Microbiology, October 2005, p. 5935-5942, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.5935-5942.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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