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Spatial and temporal variation in microcystin concentrationsduring perennial bloom of Planktothrix agardhii in a hypertrophiclake

Published online by Cambridge University Press:  15 January 2009

B. Pawlik-Skowrońska ,
J. Pirszel  and
R. Kornijów
B. Pawlik-Skowrońska
Affiliation:
Centre for Ecological Research, P.A.S. at Dziekanów Leśny, Experimental Station, Niecala 18, 20-080 Lublin, Poland. Department of Hydrobiology, University of Life Sciences at Lublin, Dobrzańskiego 37, 20-262 Lublin, Poland
J. Pirszel
Affiliation:
Centre for Ecological Research, P.A.S. at Dziekanów Leśny, Experimental Station, Niecala 18, 20-080 Lublin, Poland. present address: Military Institute of Chemistry and Radiometry, Gen A. Chruściela 105, 00-910 Warsaw, Poland
R. Kornijów
Affiliation:
Department of Hydrobiology, University of Life Sciences at Lublin, Dobrzańskiego 37, 20-262 Lublin, Poland
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Abstract

Temporal and spatial variation in the concentrations of intra- and extra-cellular microcystins were studied in a hypertrophiclake with bloom of Planktothrix agardhii (Gomont) Anagnostidis et Komarek. Concomitantly with increase in watertemperature (from 2 to 20 °C) abundance of P. agardhii increased from 1.9 x 105 to 4.3 x 107 trichomes L-1. In autumn, in spiteof temperature lower (14°C) than in summer it was still very high. Mass development of P. agardhii (to 6 x 106 L-1 and higher)caused a severe decrease in water transparency (to 0.5 - 0.2 m in summer/autumn). The cyanobacterium density was relativelyuniform within water column; only in summer (July) it was significantly higher (by about 30%) in surface than in bottom layer.From spring to autumn microcystins (MCs) were mainly biomass-bound (up to 90 μg MC-LR equiv. L-1), whereas the level ofextra-cellular toxins was much lower (up to 2 μg L-1) and relatively stable. Only in winter, high amounts of MCs (11.3 μg L-1)were released from decaying biomass into water. The increasing concentrations of biomass-bound microcystins in the lake waterpositively correlated (R2 = 0.9863; y = -0.1285x2 + 7.14x ) with the abundance of P. agardhii and the highest concentrations ofthe intracellular MC fraction were found during the exponential phase of P. agardhii growth. In addition, the surface-sampledbiomass of P. agardhii contained in autumn 2-fold more MCs (2.75 μg MC-LR equiv. per 106 P. agardhii trichomes) than thebottom-sampled one (1.41 μg MC-LR equiv. per 106 trichomes). This is the first report showing that despite the homogenousdistribution of P. agardhii in water column of a shallow lake, various seasonal and spatial distributions of both extra-cellularand intracellular fractions of microcystins occur.

Keywords

cyanobacterial bloomhypertrophic lakeintra- and extra-cellular microcystinsPlanktothrix agardhii
Type
Research Article
Information
Annales de Limnologie - International Journal of Limnology , Volume 44 , Issue 2 , 2008 , pp. 145 - 150
Copyright
© Université Paul Sabatier, 2008

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