Abstract
ABSTRACTThe growth response of a nitrogen fixing cyanobacterium, Anabaena flos‐aquae (Lyng) Bréb., to sodium and nitrate was examined in batch culture under controlled laboratory conditions. Sodium (range 0‐12 mg Na+· L‐1) enhanced growth of the cyanobacterium under nitrate‐sufficient (5.7 mg NO3‐N · L‐1) but not nitrate‐limited (0.49 mg NO3‐ N · L‐1) conditions. The magnitude of the growth response was related to the nutritional history of the culture. No significant effect of sodium on nitrate utilization was observed. The increase in ambient sodium levels in many lakes may provide a competitive advantage to cyanobacteria.
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