Abstract
Winter phytoplankton communities in the shallow alkaline pans of Hungary are frequently dominated by picoeukaryotes, sometimes in particularly high abundance. In winter 2012, the ice-covered alkaline Zab-szék pan was found to be extraordinarily rich in picoeukaryotic green algae (42–82 × 106 cells ml−1) despite the simultaneous presence of multiple stressors (low temperature and light intensity with high pH and salinity). The maximum photosynthetic rate of the picoeukaryote community was 1.4 μg C μg chlorophyll a −1 h−1 at 125 μmol m−2 s−1. The assimilation rates compared with the available light intensity measured on the field show that the community was considerably light-limited. Estimated areal primary production was 180 mg C m−2 d−1. On the basis of the 18S rRNA gene analysis (cloning and DGGE), the community was phylogenetically heterogeneous with several previously undescribed chlorophyte lineages, which indicates the ability of picoeukaryotic communities to maintain high genetic diversity under extreme conditions.
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Acknowledgments
The authors are gratefully indebted to Balázs Németh, Zsolt Gyula Keresztes, Tamás Sápi and Éva Koltai for technical assistance. This work was financially supported by the NKTH-OTKA CNK 80140 and the EnvEurope Life Environment LIFE08ENV/IT/000339 projects. B.S. and T.F. were supported by the Bolyai János Research Grant (Hungarian Academy of Sciences).
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Pálffy, K., Felföldi, T., Mentes, A. et al. Unique picoeukaryotic algal community under multiple environmental stress conditions in a shallow, alkaline pan. Extremophiles 18, 111–119 (2014). https://doi.org/10.1007/s00792-013-0602-0
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DOI: https://doi.org/10.1007/s00792-013-0602-0