Abstract
AbstractAliquots 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 PO4‐P · 1−1 week−1 and 350 μg NO3‐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.
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