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Stability of diatom composition in a variable lake environment: Lake Chascomús, Argentina
Authors:P Miretzky  N I Maidana  A Fernández Cirelli
Institution:(1) Centro de Estudios Transdisciplinarios del Agua, Facultad de Ciencias Veterinarias, Universidad de Buenos Aires, Av. Chorroarín 280, C1427CWO Buenos Aires, Argentina Tel. +54-11-4584-8484; Fax +54-11-4584-8489 e-mail: patovior@fvet.uba.ar, AR;(2) Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and CONICET, Buenos Aires, Argentina, AR
Abstract: Water and surficial sediment samples of Lake Chascomús and its tributaries were analyzed in order to relate changes in diatom community structure to chemical variables. Over the course of 13 months of sampling, the lake exhibited major changes in water level (1.15–1.98 m average depth), total dissolved solids (821–1972 mg l−1), silica (0.098–8.22 mg l−1), and total algal biomass (21.4–145.9 μg Chl a l−1). However, despite these large fluctuations, the diatom species composition was relatively stable. The dominant species in the water column was always Synedra berolinensis (68.9%–90.1% total frustules), with Fragilaria construens and F. brevistriata as subdominants. In the sediments the latter two species dominated the frustule counts. These results indicate an unusual floristic stability of this eutrophic ecosystem, with persistent dominance by broadly tolerant, generalist species. Received: April 24, 2001 / Accepted: January 23, 2002
Keywords:  Hydrochemical composition  Diatoms  Plankton  Pampa lake  Chascomús
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