Physiological Changes during Development of the Ovoviviparous Freshwater Snail, Sinotaia quadratus historica(Developmental Biology)
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概要
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The physiological characteristics of the egg shell, comprising of egg envelope, egg white and embryo, during development of the ovoviviparous snail, Sinotaia quadratus historica, were investigated. The uterus of the snail was found to contain eggs, embryos, larvae and young snails throughout the year but a marked increase of embryos and a decrease of young snails were observed from March to May. Fertilization and birth might therefore occur continuously in the seasons from spring to autumn, cease in winter, and increase markedly from March to May, without a special breeding season. The development of the embryo seemed to proceed faster than the growth of the young snail. The egg white surrounding the embryo contained water, proteins, neutral sugars and inorganic cations which decreased as development proceeded. However, the total weight of the egg shell increased during development, especially in the later stages. Increases in water and Ca^<2+> ions were remarkable and accounted for the total weight increase of the whole egg shell, suggesting their incorporation into the larva and young snail from outside the developing body, but exceeded the value by which the same components decreased in the egg white. These facts imply that water and Ca^<2+> ions for the growing snails are supplied from the mother's body as a characteristic physiological feature of the ovoviviparous snail.
- 社団法人日本動物学会の論文
- 1985-10-15
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