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JPR Advance Access originally published online on December 5, 2006
Journal of Plankton Research 2007 29(Supplement 1):i49-i59; doi:10.1093/plankt/fbl066
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© The Author 2006. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Long-term changes in the copepod community of Lake Geneva

Orlane Anneville1,*, Juan Carlos Molinero1,2, Sami Souissi2, Gérard Balvay1,3 and Daniel Gerdeaux1

1 INRA – Station d'hydrobiologie lacustre, BP 511, 75 avenue de corzent, 74203 Thonon les bains cedex, France 2 Ecosystem Complexity Research Group, Station Marine, Université des Sciences et Technologies de Lille, CNRS-UMR 8013 ELICO, 28 av. Foch, 62930 Wimereux, France 3 Retired, Personal address: 41 Chemin Froid Lieu 74200 Thonon les Bains

* Corresponding author: orlane.anneville{at}thonon.inra.fr

Received on October 28, 2005; accepted on October 24, 2006


  Abstract

Lake Geneva is a deep, peri-alpine lake where there has been a continuous monitoring program since the 1970s. The lake has long suffered from eutrophication. In the early 1980s, a restoration plan resulted in a progressive reduction in the phosphorus concentration. During the same period, the lake responded to large-scale climate changes by overall warming of the water, and changes in the timing of stratification. Both the composition and the phenology of the plankton have been affected. This paper focuses on the long-term changes observed in the copepod community. Our findings highlight a switch towards a copepod community dominated by calanoids. In addition we have detected a period (1986 to 1991, 1988 excluded) characterized by an unusual seasonal pattern of species succession. It is suggested that these changes have been induced by qualitative changes in the phytoplankton community, and underline fluctuations in trophic interactions between planktonic species. Re-oligotrophication and warming, therefore, emerge as indirect forcing factors, and these findings contribute to the debate about whether copepods can be used as indicators of environmental changes.

Communicating editor: R.P. Harris


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