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Competitive ability for phosphorus of 2 heterotrophic bacteria, isolated from the photic zone of a lake, was investigated by a growth lunetic characterization in batch cultures using a radioactive tracer. Key characteristics chosen were based on a competition model verified under both steady state and non steady state conditions in previous studies. The characterization included determination of P requirement, uptake kinetic parameters and release rates of dissolved inorganic phosphate (P,). The 2 bactena exhibited different kinetic properties that may reflect differences in competitive strategies. Strain 3h seemed to be adapted to competition at more transient or pulsed supply modes ot P,, as reflected by its P-specific maximum uptake rate, which was 4 times higher than that of strain 29. Strain 29, on the other hand, seemed to be a better competitor at un~form or moderately pulsed P, supply modes. This is due to a better ability to ma~ntain positive net P, uptake at low concentrations, with the critical concentration for positive net uptake being a factor of 2 lower for strain 2g than for strain 3h. A comparison with typical values of kinetic parameters published for cyanobacteria and green algae suggest that cyanobacteria may be better competitors than the heterotrophic bacteria at transient supply modes of Pi, whereas green algae have a comparable or better ability than the heterotrophic bacteria to compete for P at uniform supply modes of P,. These conclusions are based on relatively few data, with considerable within-group variation, and should therefore be cons~dered with caution

Evaluation of competitive ability of two heterotrophic planktonic bacteria under phosphorus limitation