Age determination by skeletochronology of the Japanese giant salamander Andrias japonicus (Amphibia, Urodela)

広島大学総合博物館研究報告 Issue 9 Page 41-47 published_at 2017-12-25
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Title ( eng )
Age determination by skeletochronology of the Japanese giant salamander Andrias japonicus (Amphibia, Urodela)
Yamasaki Hiromi
Taguchi Yuki
Minami Shinji
Kuwabara Kazushi
Source Title
Bulletin of the Hiroshima University Museum
Issue 9
Start Page 41
End Page 47
Journal Identifire
[PISSN] 1884-4243
[EISSN] 1884-3999
[NCID] AA12459864
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.
giant salamander
Andrias japonicus
age determination
natural monument
This work supported by JSPS KAKENHI Grant Numbers JP 26870400, JP 17K 01209.
Zoology [ 480 ]
Resource Type departmental bulletin paper
Date of Issued 2017-12-25
Copyright (c) 2017 広島大学総合博物館 Hiroshima University Museum
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 1884-4243
[NCID] AA12459864