Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos)
Adult male brown bears (Ursus arctos Linnaeus, 1758) display tree-marking behavior to chemically signal their dominance throughout the nondenning period, and this behavior peaks during the breeding season. Within the scent-marking sequence, back rub is a core marking posture. The present study inves...
Published in: | Canadian Journal of Zoology |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2018
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2017-0028 |
id |
crcansciencepubl:10.1139/cjz-2017-0028 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/cjz-2017-0028 2024-09-15T18:40:13+00:00 Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) Tomiyasu, Jumpei Yanagawa, Yojiro Sato, Yoshikazu Shimozuru, Michito Nagano, Masashi Sasaki, Motoki Sakamoto, Hideyuki Matsumoto, Naoya Kobayashi, Kohei Kayano, Mitsunori Haneda, Shingo Matsui, Motozumi 2018 http://dx.doi.org/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2017-0028 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 96, issue 3, page 205-211 ISSN 0008-4301 1480-3283 journal-article 2018 crcansciencepubl https://doi.org/10.1139/cjz-2017-0028 2024-09-05T04:11:14Z Adult male brown bears (Ursus arctos Linnaeus, 1758) display tree-marking behavior to chemically signal their dominance throughout the nondenning period, and this behavior peaks during the breeding season. Within the scent-marking sequence, back rub is a core marking posture. The present study investigated (i) seasonal changes in sebaceous glands in the back skin of brown bears and (ii) the relationship between those changes and testosterone levels. Back skin tissue samples and blood were collected from captive adult intact and castrated males during prebreeding, transitional, breeding, and postbreeding seasons, which were concurrent with back skin observations. In intact males, during the transitional and breeding seasons, an oily secretion from the back skin was observed along with enlarged sebaceous glands. The plasma testosterone concentrations during the transitional and breeding seasons were increased compared with the pre- and post-breeding seasons. Secretions and enlarged sebaceous glands were not found in castrated males, and the plasma testosterone concentrations remained at baseline levels. Oily secretions of the back skin glands that appear more abundant during the breeding season are rubbed against trees. Changes in size and volume of sebaceous glands, and thus their secreting capacity, are likely testosterone-regulated. Article in Journal/Newspaper Ursus arctos Canadian Science Publishing Canadian Journal of Zoology 96 3 205 211 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Adult male brown bears (Ursus arctos Linnaeus, 1758) display tree-marking behavior to chemically signal their dominance throughout the nondenning period, and this behavior peaks during the breeding season. Within the scent-marking sequence, back rub is a core marking posture. The present study investigated (i) seasonal changes in sebaceous glands in the back skin of brown bears and (ii) the relationship between those changes and testosterone levels. Back skin tissue samples and blood were collected from captive adult intact and castrated males during prebreeding, transitional, breeding, and postbreeding seasons, which were concurrent with back skin observations. In intact males, during the transitional and breeding seasons, an oily secretion from the back skin was observed along with enlarged sebaceous glands. The plasma testosterone concentrations during the transitional and breeding seasons were increased compared with the pre- and post-breeding seasons. Secretions and enlarged sebaceous glands were not found in castrated males, and the plasma testosterone concentrations remained at baseline levels. Oily secretions of the back skin glands that appear more abundant during the breeding season are rubbed against trees. Changes in size and volume of sebaceous glands, and thus their secreting capacity, are likely testosterone-regulated. |
format |
Article in Journal/Newspaper |
author |
Tomiyasu, Jumpei Yanagawa, Yojiro Sato, Yoshikazu Shimozuru, Michito Nagano, Masashi Sasaki, Motoki Sakamoto, Hideyuki Matsumoto, Naoya Kobayashi, Kohei Kayano, Mitsunori Haneda, Shingo Matsui, Motozumi |
spellingShingle |
Tomiyasu, Jumpei Yanagawa, Yojiro Sato, Yoshikazu Shimozuru, Michito Nagano, Masashi Sasaki, Motoki Sakamoto, Hideyuki Matsumoto, Naoya Kobayashi, Kohei Kayano, Mitsunori Haneda, Shingo Matsui, Motozumi Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
author_facet |
Tomiyasu, Jumpei Yanagawa, Yojiro Sato, Yoshikazu Shimozuru, Michito Nagano, Masashi Sasaki, Motoki Sakamoto, Hideyuki Matsumoto, Naoya Kobayashi, Kohei Kayano, Mitsunori Haneda, Shingo Matsui, Motozumi |
author_sort |
Tomiyasu, Jumpei |
title |
Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
title_short |
Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
title_full |
Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
title_fullStr |
Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
title_full_unstemmed |
Testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( Ursusarctos) |
title_sort |
testosterone-related and seasonal changes in sebaceous glands in the back skin of adult male brown bears ( ursusarctos) |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
http://dx.doi.org/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjz-2017-0028 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjz-2017-0028 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
Canadian Journal of Zoology volume 96, issue 3, page 205-211 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjz-2017-0028 |
container_title |
Canadian Journal of Zoology |
container_volume |
96 |
container_issue |
3 |
container_start_page |
205 |
op_container_end_page |
211 |
_version_ |
1810484531833077760 |