Etude de la contamination du bivalve d'eau douce Dreissena polymorpha par le plomb : bioaccumulation, distribution tissulaire et élimination du métal : incidence de paramètres biotiques et abiotiques

Abstract : Freshwater mussels (Dreissena polymorpha) were exposed to lead under laboratory conditions. Patterns of accumulation in whole animals were linear at low concentrations and the tissues lead concentrations were proportional to lead in the medium. At high concentrations of lead in the medium, the accumulation proceeded at a high rate in a saturating mode. Under cyclic conditions of exposure, kinetic of lead accumulation showed a pronounced biphasic mode. It is argued that the biphasic course of accumulation seemed to indicate that the animal acts as a multi-compartments accumulation system. The chelation of lead by EDTA decreased strongly its toxicity and bioaccumulation. In the presence of zinc, uptake of lead in whole Dreissena was reduced in the initial phase of accumulation. Thereafter, the antagonistic effect of Zn decreased and became not significant at the end of exposure period. A rise in temperature decreased lead accumulation by mussels. The results also indicate that accumulation were greatly affected by seasonal conditions. In spring, the rate of uptake was the faster and lead body burden was the most important. By means of histochemical staining method and microanalytical technique (LAMMA), lead has been localized mainly in granules of renal cells and in cytoplasm of granulocytes in gills, pericardial gland, byssal gland and digestive epithelium. The depuration process were low and occured sloly compared to accumulation. The original lead concentrations in the soft parts did not influence significantly the rate of elimination. The presence of EDTA or a rise in tempeature enhanced the rate of lead elimination. In all conditions, the total depuration were not attained and the tissue lead concentrations remained at high levels in comparison to controls
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Mohamed Benyahia. Etude de la contamination du bivalve d'eau douce Dreissena polymorpha par le plomb : bioaccumulation, distribution tissulaire et élimination du métal : incidence de paramètres biotiques et abiotiques. Biochimie, Biologie Moléculaire. Université Paul Verlaine - Metz, 1991. Français. ⟨NNT : 1991METZ012S⟩. ⟨tel-01775935⟩

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