Abstract
The progressive eutrophication of Lake Balaton was perceived in the early 1970s. From 1975 to 1994, the development of summer blooms of N&2inf;-fixing cyanobacteria, especially Cylindrospermopsis raciborskii, became a regular phenomenon in the western part and sometimes in the eastern part of the lake. Since 1995, the biomass of phytoplankton, particularly N&2inf;-fixing cyanobacteria, has decreased dramatically. This paper investigates the change in the akinete abundance of N&2inf;-fixing cyanobacteria in the lake sediment in the 1980s and 1990s. A direct counting method was developed for determination of the abundance of akinetes in the sediment. It was found that in parallel with the reduction in biomass of N&2inf;-fixing cyanobacteria, the abundance of akinetes decreased approximately two orders of magnitude after 1994. However, the results also suggest that the decreasing number of akinetes in the sediment could not cause a `disappearance' of cyanobacteria from the phytoplankton assemblage.
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Kovács, A.W., Koncz, E. & Vörös, L. Akinete abundance of N2-fixing cyanobacteria in sediment of Lake Balaton (Hungary). Hydrobiologia 506, 181–188 (2003). https://doi.org/10.1023/B:HYDR.0000008614.76166.28
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DOI: https://doi.org/10.1023/B:HYDR.0000008614.76166.28