Picophytoplankton predominance in hypersaline lakes (Transylvanian Basin, Romania)

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• 作者：Boglárka Somogyi ; Lajos V?r?s ; Károly Pálffy ; Gy?ngyi Székely…
• 关键词：Picoplankton importance ; Phytoplankton composition ; Salinity gradient ; Trophic gradient ; Inland saline lakes ; Transylvania
• 刊名：Extremophiles
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：18
• 期：6
• 页码：1075-1084
• 全文大小：340 KB
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• 作者单位：Boglárka Somogyi (1)
  Lajos V?r?s (1)
  Károly Pálffy (1)
  Gy?ngyi Székely (2)
  Csaba Bartha (2)
  Zsolt Gyula Keresztes (1) (3)
  
  1. MTA Centre for Ecological Research, Balaton Limnological Institute, Klebelsberg Kuno u. 3, Tihany, 8237, 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, Tatabánya, 2800, Hungary
  
• ISSN：1433-4909

文摘

The occurrence and importance of photoautotrophic picoplankton (PPP, cells with a diameter Romania). The studied lakes were found to be rich in PPP, with abundances (maximum 7.6?×?106?cells?mL?) 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 90-00?% 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.