<研究報告>カラマツガイの生殖に関する研究-I : 両性腺の季節的変化について

概要

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The present paper describes observations made in 1968 and 1969. In two stations on the rocky shores, at Katsuma in Shika Island, the observations on the size-distribution, the matings and deposited egg capsules were made in two populations Siphonaria japonica under the natural conditions in various seasons. On the other hand in the laboratory, the degrees of development of germ cell were ascertained regularly at monthly intervals by the microscopic examination in the sections of ovotestis. It has been obtained that the size-distribution was ranging from 0.9 to 1.2 c. m. in shell length in adult population of this species. It is obvious that by examinations on the ovotestis, which is composed of the testicular and ovarian portion, the former centrally and the latter peripherally, and then the first signs of protandric gametogenesis occur within the follicles of testicular portion in late September. It is recognized that the appearance of ova occurs on the peripheral wall of the male follicles in December, after male cells developed. It has been observed that these limpets had the largest ovotestis in February and March, and many of them mated in March and April. It appears that the spawning commenced in March and was intensive during the period of late March-May and completed by June.
福岡女子大学の論文
1976-03-31