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Two planktonic desmid taxa,  Staurastrum chaetoceras  and  Cosmarium abbreviatum  var.  planctonicum , were examined under pulsed phosphorus (P)-limited conditions in continuous culture. Two pulse regimes were applied, i.e. 2.5 μM P twice a week and 10 μM P once every 2 weeks. Under both pulse regimes,  S.chaetoceras  showed a higher maximum P uptake rate ( V  max ) and affinity for P uptake ( V  max /affinity constant  K  m ) than  C.abbreviatum . Affinity for P uptake in  S.chaetoceras  just before pulsing was higher than shortly after pulsing, whereas  C.abbreviatum  did not show any significant difference. Cell densities and cellular P quota in  S.chaetoceras  and  C.abbreviatum  fluctuated in a comparable way, but fluctuations in  C.abbreviatum  were less pronounced than in  S.chaetoceras . The mean cell volume of both species was greater under the bimonthly than under the biweekly pulse regime, and the lowest under continuous P-limited conditions. Competition between  S.chaetoceras  and  C.abbreviatum  under the bimonthly pulse regime was won by  S.chaetoceras , but displacement was less fast than under more frequent pulsing (equalling the same total P supply). The above-mentioned results are discussed in relation to possible ecological strategies.

Growth kinetic parameters of two planktonic desmid species under fluctuating phosphorus conditions in continuous-flow culture