Reproductive Biology of Semisulcospira libertina (Prosobranchia : Pleuroceridae) in Iga Basin, Mie Prefecture

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  • 三重県伊賀地方にみられるカワニナの繁殖生態
  • Reproductive Biology of Semisulcospira

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The reproductive cycle of an ovoviviparous freshwater snail, Semisulcospira libertina, was studied in the Otani and Kohno populations in the Iga Basin with reference to changes in embryo stage composition in the brood pouch. The number of embryos per snail of 25-30 mm in shell height varied seasonally from 250 to 1000 in the Otani population and from 250 to 700 in the Kohno population, increasing in summer and decreasing in spring. Eggs were supplied to the brood pouch during the warm season from late April to mid October. Growth of embryos ceased in the winter. Eggs supplied before August developed into shelled embryos and were released from late June to October of the same year, whereas those supplied after late August were dormant over the winter and released from April to June of the next year. Duration of incubation was estimated to be 8 months for over wintered spring offspring, and about 2 months for summer-autumn offspring. Annual offspring productivity per snail was estimated to be about 1550-2100 individuals in the Otani and 1200 in the Kohno populations, if suppose the duration of incubation being uniformal through the warm season.

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