Effets de l'échauffement des eaux sur le cycle de reproduction de la moule d'eau douce dreissena polymorpha (Bivalve dreissanidae) : étude in situ et en laboratoire aspects histologiques, histochimiques et biochimiques

Abstract : The thermal effects on the biology of reproduction cycle of the bivalve Dreissena polymorpha are studied. The selection of two industrial sites allowed to test in situ differences of temprature from +2 to +7°C between control and overheated stations. The chronological stages of reproduction cycle nomenclature is established. Normally the gametogenic quiescence occurs in the cold season ; development and maturation of gametes begin in spring. The spawning activity occurs in late spring and continues during summer. The analysis of body weight variations and the main biochemical components (proteins, lipids and carbohydrates) enabled us to confirm and improve the interpretation of reproduction cycle in relation to hydrobiological water parameters. The histochemical and biochemical analysis complement each other and permit to affirm that lipids are important in the vitellogenic material. Lipid variations considered as indicators of spawing stage. The recovery of gametogenesis is precocious for mussels. During quiescence period, laboratory acclimation mussels to +8°C, induces recovery of gametogenesis and sexual maturation is reached precociously. There is evidence of histological alterations in mussels exposed to higher temperatures. The biochemical analysis of animals at worm stations showed a decrease of the lipid contents in spring indicating an early spawning. No significant differences have been found in protein content between control and test animals. In contrast, the carbohydrate contents are higher in test animals
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Abdellatif Tourari. Effets de l'échauffement des eaux sur le cycle de reproduction de la moule d'eau douce dreissena polymorpha (Bivalve dreissanidae) : étude in situ et en laboratoire aspects histologiques, histochimiques et biochimiques. Biologie animale. Université Paul Verlaine - Metz, 1988. Français. ⟨NNT : 1988METZ017S⟩. ⟨tel-01775759⟩

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