ダウンロード数: 866
タイトル: | Estimation of age structure by skeletochronology of a population of Hynobius nebulosus in a breeding season (Amphibia, Urodela) |
著者: | Ento, Kyoko Matsui, Masafumi |
著者名の別形: | 松井, 正文 |
キーワード: | age estimation age structure Hynobius nebulosus skeletochronology growth curve |
発行日: | Feb-2002 |
出版者: | Zoological Society of Japan |
誌名: | Zoological Science |
巻: | 19 |
号: | 2 |
開始ページ: | 241 |
終了ページ: | 247 |
抄録: | Using skeletochronology, we determined the age structure of adult Hynobius nebulosus from Kyoto in the breeding season of 1998. From previously marked individuals, the lines of arrested growth proved to be formed once per year, indicating the number of winters each salamander experienced. The age at first reproduction was estimated to be 2.8-2.9 yrs of age in males and 3.8-3.9 yrs in females. The oldest males and females were 9.8-9.9 and 5.8-5.9 yrs of age, respectively, and, therefore the longevity in this species was estimated to be more than 9 yrs for males and 5 yrs for females. The growth curve of male's body size estimated indicated that the growth rate much decreases after males attained sexual maturity. Because body sizes of adults greatly vary even within an age class, it is dangerous to estimate individual age from the size frequency data at least in adults. We discussed age properties in Hynobius by comparing lentic and lotic breeders. |
著作権等: | (c) 日本動物学会 / Zoological Society of Japan |
URI: | http://hdl.handle.net/2433/65046 |
DOI(出版社版): | 10.2108/zsj.19.241 |
出現コレクション: | Zoological Science |
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