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ID 45332
本文ファイル
著者
Yamasaki, Hiromi
Taguchi, Yuki
Minami, Shinji
Kuwabara, Kazushi
キーワード
giant salamander
Andrias japonicus
age determination
skeletochronology
amphibians
natural monument
NDC
動物学
抄録(英)
In the past several years, a number of studies have been carried out on the behavioral and reproductive ecology of the Japanese giant salamander Andrias japonicus, but the age and longevity of A. japonicus has not yet been studied. In this study, we attempted to establish an age determination method using specimens (age: 1 to 11 years old) from Hiroshima City Asa Zoological Park that lived and died in captivity. The cross sections of phalangeal bones were nearly circular in shape, and hematoxylinophilic lines that were interpreted as lines of arrested growth (LAGs) were observed in the periosteal tissue; this suggests that this technique can be used to estimate the age of A. japonicus. The number of LAGs was one less than the number of winters that each individual experienced. We could observe LAGs in both frozen and 10% formalin specimens. LAGs could be confirmed even for specimens that had been fixed in formalin for up to 30 years. By using this method, it was suggested that the lifespan of this species could be determined from specimens existing in museums, zoos, and aquariums worldwide. It also showed potential for providing important conservation information, such as generation time and age structure of populations in the field.
内容記述
This work supported by JSPS KAKENHI Grant Numbers JP 26870400, JP 17K 01209.
掲載誌名
広島大学総合博物館研究報告
9号
開始ページ
41
終了ページ
47
出版年月日
2017-12-25
出版者
広島大学総合博物館
ISSN
1884-4243
NCID
言語
英語
NII資源タイプ
紀要論文
広大資料タイプ
学内刊行物(紀要等)
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2017 広島大学総合博物館 Hiroshima University Museum
部局名
総合博物館
生物圏科学研究科
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