| Item type |
紀要論文 / Departmental Bulletin Paper(1) |
| 公開日 |
2021-06-30 |
| タイトル |
|
|
タイトル |
Effect of diet on faecal testosterone metabolite levels in a northern fur seal (Callorhinus ursinus) expressed as ash-free dry weight |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Faecal composition |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
ash-free dry weight |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
steroid hormones |
| 資源タイプ |
|
|
資源 |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
departmental bulletin paper |
| ID登録 |
|
|
ID登録 |
10.15083/0002000461 |
|
ID登録タイプ |
JaLC |
| 著者 |
Otsuki, Mayuko
Kohyama, Kaoru
Goshima, Wataru
Kobayashi, Motoki
Hasegawa, Yuya
Morita, Yuka
Ijiri, Shigeho
Mitani, Yoko
|
| 著者所属 |
|
|
言語 |
en |
|
著者所属 |
Field Science Center for Northern Biosphere, Hokkaido University |
| 著者所属 |
|
|
言語 |
en |
|
著者所属 |
Izu Mito Sea Paradise |
| 著者所属 |
|
|
言語 |
en |
|
著者所属 |
Graduate School of Fisheries Sciences, Hokkaido University |
| 著者所属 |
|
|
言語 |
en |
|
著者所属 |
Institute for East China Sea Research, Nagasaki University |
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
The northern fur seal (Callorhinus ursinus) inhabits the North Pacific Ocean and Bering Sea, where it feeds on a variety of prey. In this study, we studied a captive male to determine how different prey affect the composition of and testosterone metabolites in the faeces. Faecal steroid metabolite levels are often expressed per unit dry weight (DW) of faeces, but dry faeces contain both organic and inorganic matter, so we also measured the ash-free dry weight (AFDW), which can more accurately express the levels in samples with organic matter. The mean organic component of faeces was lower when the seal fed on fish than when it fed on squid. Testosterone metabolite levels in the AFDW and serum testosterone levels showed a significant relationship in faeces collected one day after the blood withdrawal. When the seal fed on squid, differences in testosterone metabolite levels between DW and AFDW were small. These results suggest that faecal testosterone metabolite levels expressed in quantities per unit of AFDW are more useful than DW to understand the reproductive physiology of seals. |
|
言語 |
en |
| 書誌情報 |
en : Coastal marine science
巻 44,
号 1,
p. 1-6,
発行日 2021
|
| ISSN |
|
|
収録物識別子タイプ |
PISSN |
|
収録物識別子 |
13493000 |
| 書誌レコードID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11957899 |
| 出版者 |
|
|
出版者 |
International Coastal Research Center, Atmosphere and Ocean Research Institute, the University of Tokyo |
|
言語 |
en |
| 出版者別名 |
|
|
|
東京大学大気海洋研究所国際沿岸海洋研究センター |
CMS440101.pdf (571KB)
