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Growth and toxicity of Prorocentrum lima (Ehrenberg) Dodge in different culture media: Effect of humic acids and organic phosphorus
Sohet, K.; Pereira, A.; Braekman, J.C.; Houvenaghel, G. (1995). Growth and toxicity of Prorocentrum lima (Ehrenberg) Dodge in different culture media: Effect of humic acids and organic phosphorus, in: Lassus, P. et al. (Ed.) (1995). Harmful marine algal blooms: Proceedings of the Sixth International Conference on toxic marine phytoplankton = Proliférations d'algues marines nuisibles: Sixiéme Conférence Internationale sur le phytoplancton toxique, October 18-22, 1993, Nantes, France. pp. 669-674
In: Lassus, P. et al. (Ed.) (1995). Harmful marine algal blooms: Proceedings of the Sixth International Conference on toxic marine phytoplankton = Proliférations d'algues marines nuisibles: Sixiéme Conférence Internationale sur le phytoplancton toxique, October 18-22, 1993, Nantes, France. Technique et Documentation - Lavoisier/Intercept: Paris. ISBN 2-85206-972-5. XXIII, 878 pp., more

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Document type: Conference paper

Keywords
    Algal blooms; Animal metabolism; Humic acids; Phosphorus compounds; Prorocentrum lima (Ehrenberg) F.Stein, 1878 [WoRMS]; Marine

Authors  Top 
  • Sohet, K.
  • Pereira, A.
  • Braekman, J.C., more
  • Houvenaghel, G., more

Abstract
    The influence of humic acids and phosphorus (glycerophosphate or NaH2PO4) were investigated at different concentration on growth and toxicity of Prorocentrum lima in culture. The presence of humic acids at all concentrations tested as well as high concentrations of EDTA (100µM) greatly enhance both growth rates and total cell yields. The presence of chelating substances is thus a main factor controlling P. lima growth. Total cell numbers and growth rates are not significantly different between the two forms of phosphate tested excepted at the limiting concentration (10µM) at which mineral phosphate induces higher growth rates. Lag phases are always longer in presence of glycerophosphate than with mineral phosphate but this difference is suppressed by the presence of humic acids in the medium. Our results confirm the fact, already demonstrated in various conditions and for different strains, that limitation of growth in P. lima induces higher okadaic acid contents per cell in stationary phase. In the present work, the highest toxin contents (10 pg/cell) were obtained at low concentrations of organic phosphate associated with long lag phase and low growth rates.

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