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Sedimentary imprint of cyanobacterial blooms : a new tool for insight into recent history of lakes

Pawlik-Skowrońska B., Kornijów R., Pirszel J.

Polish Journal of Ecology

2010

Vol. 58, nr 4

663-670

Recent history of numerous lakes is, among others, a consequence of anthropogenic activity that led to water eutrophication and excessive phytoplankton development. In nutrient-rich lakes both biomass of cyanobacteria and cyanotoxins, that may have a substantial impact on aquatic biocenoses, are present not only in water column but also in the bottom sediments. This study demonstrates vertical distribution of microcystins (MC) traces in sediments of two eutrophic lakes - one phytoplankton/macrophyte-dominated and the other phytoplankton-dominated. The sediments (1-40/50 cm depth) were sampled from central part of lakes and content of MC traces was determined by means of GC-MS in 1cm core slices. In the sediment profile (1-40 cm depth) of the phytoplankton/macrophyte-dominated lake the MC contents ranged from 0.011 in deep layer (35 cm) to 0.910 [mu]g equival. MC-LR g[^-1] d.w. in the surface layer (1 cm) and indicated gradual increase in eutrophication . connected with mass development of cyanobacteria over time. In phytoplanktondominated lake, MC contents (0.0-0.335 [mu]g equival. MC-LR g[^-1] d.w.) oscillated through the core (1-50 cm depth) and were relatively similar in older, deeper (20-50 cm) and younger (1-20 cm) layers what suggests long-lasting but variable intensity of cyanobacteria mass development. The obtained results indicate that traces of microcystins persist and are detectable for several dozens years not only in surface but also in deep sediment layers of lakes affected by former cyanobacterial blooms. They seem to be a reliable tool to follow eutrophication and its consequence - excessive development of cyanobacteria in the past time.

Rozwój zakwitów sinicowych w Polsce na przykładzie zbiornika sulejowskiego

Kabziński A. K. M., Grabowska H.

Gospodarka Wodna

2008

Nr 5

194-207

Przedstawiono wyniki badań nad warunkami rozwoju za kwitów sinicowych w zbiorniku sulejowskim, przeprowadzonych w latach 1983-2003. Zaprezentowano również rezultaty dokonanej analizy wpływu podstawowych parametrów środowiska wodnego zbiornika na intensywność rozwoju tych zakwitów.

The article presents results of the research on cyanobacteri-al bloorns conditions in the Sulejowski reservoir, realised in the years 1983-2003. It also presents results of the analysis of the basie water environment parameters influence on the intensity of blooms' development.