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Extremophiles

, Volume 18, Issue 6, pp 1075–1084 | Cite as

Picophytoplankton predominance in hypersaline lakes (Transylvanian Basin, Romania)

  • Boglárka Somogyi
  • Lajos Vörös
  • Károly Pálffy
  • Gyöngyi Székely
  • Csaba Bartha
  • Zsolt Gyula KeresztesEmail author
Original Paper

Abstract

The occurrence and importance of photoautotrophic picoplankton (PPP, cells with a diameter <2 μm) was studied along a trophic and salinity gradient in hypersaline lakes of the Transylvanian Basin (Romania). The studied lakes were found to be rich in PPP, with abundances (maximum 7.6 × 106 cells mL−1) higher than in freshwater and marine environments of similar trophic conditions. The contribution of PPP to the total phytoplankton biovolume did not decrease with increasing trophic state as it was generally found in other aquatic environments. Regardless of the trophic conditions, the contribution of PPP could reach 90–100 % in these hypersaline lakes. We hypothesized that the PPP predominance might be the result of the low grazing pressure, since heterotrophic nanoflagellates (the main grazers of PPP) were absent in the studied samples. There were significant differences in community composition among the lakes along the salinity gradient. CyPPP predominated in less saline waters (mainly below 5 %), while EuPPP were present along the entire salinity range (up to 18.7 %), dominating the phytoplankton between 3 and 13 % salinity. Above 13 % salinity, the phytoplankton was composed mainly of Dunaliella species.

Keywords

Picoplankton importance Phytoplankton composition Salinity gradient Trophic gradient Inland saline lakes Transylvania 

Abbreviations

CyPPP

Picocyanobacteria

DCM

Deep chlorophyll a maximum

DGGE

Denaturing gradient gel electrophoresis

DO

Dissolved oxygen

EuPPP

Picoeukaryotes

HNF

Heterotrophic nanoflagellates

PPP

Photoautotrophic picoplankton

SC

Specific conductance

Notes

Acknowledgments

This work was supported by the Human Resources Development Program (POSDRU 88/1.5/S/60185, Doctoral studies: through science toward society), CNCSIS/UEFISCDI TE306/70 2010-2013, the Hungarian Scientific Research Fund (OTKA K 73369) and partly by the Romanian National Authority for Scientific Research, CNCS–UEFIS-CDI, project numbers PN-II-ID-PCE-2011-3-0546. The authors are grateful to Balázs Németh, Éva Koltai and Erika Nagy for their technical assistance. Boglárka Somogyi was supported by the Bolyai János Research Grant (Hungarian Academy of Sciences) and Zsolt Gyula Keresztes supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of TÁMOP-4.2.4.A/2-11/1-2012-0001 ‘National Excellence Program’ and Collegium Talentum, Tatabánya.

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Copyright information

© Springer Japan 2014

Authors and Affiliations

  • Boglárka Somogyi
    • 1
  • Lajos Vörös
    • 1
  • Károly Pálffy
    • 1
  • Gyöngyi Székely
    • 2
  • Csaba Bartha
    • 2
  • Zsolt Gyula Keresztes
    • 1
    • 3
    Email author
  1. 1.MTA Centre for Ecological ResearchBalaton Limnological InstituteTihanyHungary
  2. 2.Hungarian Department of Biology and Ecology, Faculty of Biology and GeologyBabes-Bolyai UniversityCluj-NapocaRomania
  3. 3.Edutus College, Institute of TechnologyTatabányaHungary

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