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ID 45332
file
creator
Yamasaki, Hiromi
Taguchi, Yuki
Minami, Shinji
Kuwabara, Kazushi
subject
giant salamander
Andrias japonicus
age determination
skeletochronology
amphibians
natural monument
NDC
Zoology
abstract
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.
description
This work supported by JSPS KAKENHI Grant Numbers JP 26870400, JP 17K 01209.
journal title
Bulletin of the Hiroshima University Museum
issue
Issue 9
start page
41
end page
47
date of issued
2017-12-25
publisher
広島大学総合博物館
issn
1884-4243
ncid
language
eng
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2017 広島大学総合博物館 Hiroshima University Museum
department
Hiroshima University Museum
Graduate School of Biosphere Science
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