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Variability of sediment diatom assemblages of Lake Pont-de-Salarson the Viaur River (France)

Published online by Cambridge University Press:  15 March 2009

S. O. Chung  and
R. Le Cohu
S. O. Chung
Affiliation:
Centre d'Ecologie des Systèmes Aquatiques Continentaux, UMR C5576, Université Paul-Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France [email protected]
R. Le Cohu
Affiliation:
Centre d'Ecologie des Systèmes Aquatiques Continentaux, UMR C5576, Université Paul-Sabatier, 118 route de Narbonne, 31062 Toulouse cedex, France
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Abstract

Limnological surveys from the pelagic zone of Lake Pont-de-Salars were undertaken during the 1993-1996 period, which included the emptying of the whole-lake in summer 1995 and the first post year refilling. This reservoir was warm and monomictic and was determined to vary between oligo- and meso-eutrophic status from year to year. Three sediment cores were collected from the deepest zone and frozen in situ during the short drying period, just after the emptying and before the refilling of the reservoir. Analysis of the relative abundance and vertical distribution of diatom taxa was undertaken. The diatom vertical distribution, evident by visual biostratigraphy, is confirmed by the correspondence analysis (CA) despite of absence of sediment dating.

Keywords

diatomssedimentlakerelative abundancebiostratigraphycorrespondence analysisdiatoméessédimentslacabondance relativebiostratigraphieanalyse de correspondance
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 37 , Issue 3 , September 2001 , pp. 167 - 176
Copyright
© Université Paul Sabatier, 2001

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