Stir-up effect of wind on a more-or-less stratified shallow lake phytoplankton community,Lake Balaton,Hungary |
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| Authors: | Judit Padisák László G-Tóth Miklós Rajczy |
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| Institution: | (1) Botanical Department of the Hungarian Natural History Museum, Pf. 222, H-1476 Budapest, Hungary;(2) Balaton Limnological Research Institute of the Hungarian Academy of Sciences, H-8237 Tihany, Hungary |
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| Abstract: | Microstratification of phytoplankton in the large shallow Lake Balaton (Hungary) was studied during a 24 h period. Dissolved O2 showed biological stratification; flagellates exhibited a definite circadian rhythm. In the middle of the investigation a heavy storm broke out which was followed by the disappearance of differences between different layers of water. Storm-induced destratification is described by cluster-analysis. Abundances of dominant species changed differently in connection with the storm. Numbers of Nitzschia sp. increased due to stirring up from the sediment surface. Numbers of single-celled or colony-forming species (Cyclotella comta, Crucigenia quadrata, Coelosphaerium kuetzingianum) practically did not change. Numbers of all the three dominant filamentous species (Aphanizomenon fos-aquae f. klebahnii, Lyngbya limnetica, Planctonema lauterbornii) significantly decreased, which might be attributed to an unknown loss process and was followed by a competitive displacement by algae of small cell size. |
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| Keywords: | shallow lakes phytoplankton seasonal succession short-term changes mixing filamentous algae loss processes |
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