Abstract
The vertical and seasonal distributions of the phytoflagellate Cryptomonas spp., and its most common, the planktonic ciliate predators (Oligotrichida, Scuticociliatida, Hypotrichida and Prostomatida) were investigated in chemocline region of small saline, meromictic lake Shunet (Siberia, Russia) during 2003 and 2005. The lake has a pronounced chemocline, with abundance of purple and green sulphur bacteria. Vertical distribution of the Cryptomonas populations near the oxic/anoxic boundary layer was studied at close intervals in water sampled using a hydraulically operated thin-layer sampler. In both summer and winter, Cryptomonas peaked in water stratum 5–10 cm above anoxic zone or in the anoxic zone water column in the chemocline (about 5 m). Ciliate densities and biomass were also much higher in chemocline than in mixolimnion. The range of diurnal migration of Cryptomonas population was not very wide, and it was restricted to layers with high light intensity. The ciliates were sometimes detected above the upper border of the anoxic zone but also several centimetres below this zone.
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Acknowledgments
We would like to thank to Dr. Ramesh D. Gulati (Handling editor) for his critical reading of and comments on this manuscript and for his advice. We also want to thank the reviewers, whose comments have been valuable and useful. This work was supported by Russian Foundation for Basic Research (RFBR) and Krasnoyarsk Region Science Foundation Grant No. 09-04-98042-r_sibir_a, by RFBR Grant no. 09-05-00915-a, 10-04-10142-k, by the Netherlands Organization for Scientific Research (NWO) and RFBR Grant no. 047.017.012. The work was partially supported by Integration project of SB RAS No. 95.
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Handling Editor: R.D. Gulati.
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Khromechek, E.B., Barkhatov, Y.V. & Rogozin, D.Y. Densities and distribution of flagellates and ciliates in the chemocline of saline, meromictic Lake Shunet (Siberia, Russia). Aquat Ecol 44, 497–511 (2010). https://doi.org/10.1007/s10452-010-9332-x
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DOI: https://doi.org/10.1007/s10452-010-9332-x