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ID 6991
タイトルヨミ
オオタニシ ニオケル セイシ セイジュク ト イケイ セイシ ノ ウンドウ カイシ パターン
日本語以外のタイトル
Sperm Maturation and Motility Initiation Pattern in the Paraspermatozoa of Cipangopaludina Japonica
ファイル
言語
日本語
属性
自然科学
著者
舟木 賢治
杵築 啓太
内容記述(抄録等)
Generation of two types of spermatozoa, eusperm and parasperm is a common feature in most Prosobranch snails. In addition, Cipangopaludina Japonica produces two different sized parasperms, micro and macro parasperm. Recently, we have reported that there was a remarkable difference in motility initiation in vitro between micro and macro parasperms, that is, at the start of culture, all the micro parasperms have actively moved, while the macro parasperms have never shown any motion. After then, the fact was newly observed in some individuals that both micro and macro parasperms had actively moved at the start of culture. About these differential patterns of motility initiation were divided into two type, namely, the former is type A and the later is type B.
In present investigation, the motility initiation pattern of the macro parasperms was type A in individuals with well-developed testis in which almost all the eusperms were on the way of metamorphosis, indicating that the spermatogenesis is very active. In contrast, the motility initiation pattern was type B in individuals with underdeveloped testis in which almost all the eusperms have done metamorphosis. Furthermore, the motility activity of eusperm was very low in individuals which parasperm indicate the motility initiation pattern of type B. These findings indicated that the motility initiation pattern of parasperm is type A in the bleeding season of this species and it is important for reproductive advantage.
掲載誌名
島根大学教育学部紀要
43
開始ページ
117
終了ページ
122
ISSN
18808581
発行日
2009-12-25
NCID
AA12171265
DOI(SelfDOI)
出版者
島根大学教育学部
出版者別表記
Faculty of Education Shimane University
資料タイプ
紀要論文
ファイル形式
PDF
著者版/出版社版
出版社版
部局
教育学部
他の一覧