1 In: EXTREMOPHILES (ISSN: 1431-0651) DOI 10.1007/s00792-014-0685-2 http://link.springer.com/article/10.1007%2Fs00792-014-0685-2 Picophytoplankton predominance in hypersaline lakes (Transylvanian Basin, Romania) Boglárka Somogyi 1 , Lajos Vörös 1 , Károly Pálffy 1 , Gyöngyi Székely 2 , Csaba Bartha 2 , Zsolt Gyula Keresztes 13 1 MTA Centre for Ecological Research, Balaton Limnological Institute, Klebelsberg Kuno u. 3., H-8237 Tihany, Hungary 2 Hungarian Department of Biology and Ecology, Faculty of Biology and Geology, Babes- Bolyai University, Clinicilor str., nr.5-7, 400006 Cluj-Napoca Romania 3 Edutus College, Institute of Technology, Studium sqr. 1, H-2800 Tatabánya, Hungary Corresponding author: Zsolt Gyula Keresztes; Tel.: +36 87 448 244; Fax.: +36 87 448 006; E-mail: keresztes.zsolt@okologia.mta.hu List of 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