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Influence of experimental toxification by DSP producing microalgae, Prorocentrum lima, on clearance rate in blue mussels Mytilus edulis
Pillet, S.; Houvenaghel, G. (1995). Influence of experimental toxification by DSP producing microalgae, Prorocentrum lima, on clearance rate in blue mussels Mytilus edulis, 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. 481-486
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
    Algae; Animal metabolism; Biological poisons; Toxicity tests; Bivalvia [WoRMS]; Mytilus edulis Linnaeus, 1758 [WoRMS]; Prorocentrum lima (Ehrenberg) F.Stein, 1878 [WoRMS]; Marine

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  • Pillet, S.
  • Houvenaghel, G., more

Abstract
    The effects of PSP-producing microalgae on many species of molluscs have already been demonstrated. Typical sensitive functions in mussels are byssus and mucus production, shell valve closure and particle clearance rate. Lethal effects of PSP toxins on mussels have also been observed. Similar studies on the effects of DSP toxins are few. During the experiments presented here, we studied the effects of DSP-toxin-producers, Prorocentrum lima on clearance rates in blue mussels. For this purpose, P. lima cells at different concentrations (104, 105, 106 cells/l) were included in a diet consisting of a suspension of Isochrysis galbana at 8.107 cells/l. The Isochrysis cells were labelled (C14) in order to measure the clearance rate. A similar set of experiments with non toxic Prorocentrum micans cells was used as control for the effect of suspension density on filtration rate. After 1 hour of filtration, filtration rates of mussels exposed to 10 cells/liter of P. lima became significantly lower than those measured in the control suspension of P. mican. Such reduction of clearance rate could be the consequence of a direct influence of DSP toxins on mussel gills or could express a physiological stress resulting from the newly assimilated toxin effects.

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