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Journal of Plankton Research Vol.23 no.4 pp.353-363, 2001
© Oxford University Press 2001

Conspicuous Peak of Oligotrichous Ciliates Following Winter Stratification in a Bog Lake

Miroslav Macek1,3, Karel Simek1 and Thomas Bittl2

1 Hydrobiological Institute Of The Academy Of Sciences Of The Czech Republic, Na Sádkách 7, Cz – 370 05 ceské Budejovice, Czech Republic And 2 Institute Of Freshwater Ecology And Inland Fisheries, Alte Fischerhütte 2, G-16775 Neuglobsow, Germany

3 Present Address And Address For Correspondence: National Autonomous University Of Mexico, Campus Iztacala, Tlalnepantla, 54090, EdO. Mexico, Mexico

We analysed early spring protozooplankton peaks following winter stratification in two different basins (northeast, NE; southwest, SW) of an artificially-divided bog lake Große Fuchskuhle(Brandenburg, Germany). The maximum ciliate biomass and numbers (660 and 990 µg l–1 of organic carbon, and 290 and 260 cells ml–1 in NE and SW, respectively) were reached in the surface layer during the ice melting and then continuously decreased. The surface layers were numerically dominated by species of the genus Urotricha, while in the ciliate biomass during the first part of the study, a mixotrophic oligotrich, Pelagostrombidium mirabile prevailed (Corg up to 940 µg l–1). We observed a conspicuous ciliate peak that could not be related to the feeding activity of the dominant ciliate species upon picoplankton. Seemingly, the peak was related to the specific conditions resulting from the ice melting where these ciliates could be concentrated. Additionally, the mixotrophy of oligo-trichous species allowed them to penetrate below the oxycline, although feeding on nanoplankton such as flagellates was also very likely. Our direct measurements of uptake rates of bacteria showed that the abundant strombidiids were not nutritionally dependent on bacterivory. However, the ciliate uptake rate (up to 670 bacteria ciliate–1 h–1) contributed significantly to the overall bacteria mortality rate. The maximum (community average) cell-specific ciliate feeding rate of over 200 bacteria ciliates–1 h–1 was reached, along with an increasing contribution of scuticociliates, paralleled by a drop in large oligotrichs.


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