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Title Transcription
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
Title Alternative (English)
Sperm Maturation and Motility Initiation Pattern in the Paraspermatozoa of Cipangopaludina Japonica
File
language
jpn
Attribute
Natural Science
Author
Funaki, Kenji
Kizuki, Keita
Description
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.
Journal Title
島根大学教育学部紀要
Volume
43
Start Page
117
End Page
122
ISSN
18808581
Published Date
2009-12-25
NCID
AA12171265
DOI(SelfDOI)
Publisher
島根大学教育学部
Publisher Aalternative
Faculty of Education Shimane University
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Faculty of Education
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