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JPR Advance Access published online on December 12, 2005
Journal of Plankton Research, doi:10.1093/plankt/fbi110
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received April 3, 2005
Accepted November 30, 2005

Article

Anthropogenic and climate forcing on the long-term changes of planktonic rotifers in Lake Geneva, Europe

Juan Carlos Molinero 1 *, Orlane Anneville 2, Sami Souissi 1, Gérard Balvay 2, and Daniel Gerdeaux 2

1 Ecosystem Complexity Research Group, Station Marine, Université des Sciences et Technologies de Lille, CNRS-UMR 8013 ELICO, 28 av. Foch, 62930 Wimereux, France
2 INRA - Station d’hydrobiologie lacustre, BP 511, 75 avenue de Corzent, 74203 Thonon les Bains cedex, France

* To whom correspondence should be addressed.
Juan Carlos Molinero, E-mail: molinero{at}pop.univ-lille1.fr, molinero@thonon.inra.fr


  Abstract

Climatic and anthropogenic forcing on the long-term changes in the community of rotifers were investigated during the period 1969 to 1998 in Lake Geneva. The results showed a cascade of links between large-scale climate indices and phosphorus concentrations, acting as main factors, and the long-term changes in the pelagic ecosystem in Lake Geneva. Accordingly, we identified substantial changes in the structure of the rotifers community related to changes of the food web at the study site during the last three decades. Furthermore, we identified an abrupt shift ca 1987 in the size structure of the rotifers community, which was closely linked with both increased in water temperature and decrease in phosphorus. The observed ecological changes in phytoplankton variability and rotifers size-structure are discussed in the framework of modification in the trophic state of Lake Genava. Overall, these results deserve attention by showing that strong environmental changes in pelagic ecosystems affect not only the abundance of pelagic populations but also their size structure, which has implications for ecological interactions and coupling between low and high trophic levels. The size-based approach we have developed appears complementary to the taxonomic one (i.e. keystone species) and therefore it is a useful tool to assess long-term changes in the functioning of the plankton communities.

Communicating Editor: IR Jenkinson


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