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Competition between Phyto‐ and Bacterioplankton of Lake Balaton in Continuous Cultures
Author(s) -
Shafik Hesham M.,
Mastala Zoltán,
Vörös Lajos
Publication year - 1998
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.19980830513
Subject(s) - bacterioplankton , phytoplankton , nutrient , biology , bacteria , competition (biology) , carbon source , ecology , botany , biochemistry , genetics
Aliquots of a water sample taken from the mesotrophic basin of Lake Balaton in August were incubated in three identical (2 liter) chemostats. Nutrients (35 μg PO 4 ‐P · 1 −1 week −1 and 350 μg NO 3 ‐N · 1 −1 week −1 ) were added by weekly pulses to the first culture and by continuous supply to the other two. The third culture was enriched continuously with Na‐acetate (5 mg · 1 −1 week −1 ). Pulsed nutrient supply resulted in permanent coexistence of three algal species ( Mougeotia sp., Synedra acus v. radians and Lyngbya limnetica ) while the continuous supply (second culture) led to the predominance of Lyngbya limnetica . The Na‐acetate addition experiment showed, that in the absence of carbon limitation, picophytoplankton were able to compete successfully with bacteria. The results indicate that indigenous phytoplankton can only thrive when bacterial growth is limited by carbon.