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タイトル: Social relationship and hair cortisol level in captive male chimpanzees (Pan troglodytes)
著者: Yamanashi, Yumi
Teramoto, Migaku
Morimura, Naruki
Nogami, Etsuko
Hirata, Satoshi
著者名の別形: 山梨, 裕美
寺本, 研
森村, 成樹
野上, 悦子
平田, 聡
キーワード: Social behavior
Hair cortisol
Chimpanzee
Long-term stress
Animal welfare
発行日: Mar-2018
出版者: Springer Japan
誌名: Primates
巻: 59
号: 2
開始ページ: 145
終了ページ: 152
抄録: Understanding how social relationships affect long-term stress is important because stress has a profound impact on the welfare of animals and social relationships often exert a strong influence on their stress responses. The purpose of this study was to investigate the relationship between social behaviors and long-term stress levels as assessed by hair cortisol (HC) concentration. The subjects were 11 chimpanzees living in an all-male group (divided into two sub-groups) in Kumamoto Sanctuary, Kyoto University, Japan. Behavioral data were collected between December 2014 and March 2015. The total observation time was 129 h. Hair samples were collected in late March and early April 2015, and cortisol was extracted from the hair and measured with enzyme immunoassay. The hair growth rate was estimated to be 1.33 ± 0.06 cm/month. The results revealed that there was a positive correlation between the rate of receiving aggression and HC levels. We also found a significant negative correlation between the balance between giving and receiving grooming (grooming balance index: GBI), which was calculated by subtracting the rate with which grooming is given from that with which it is received, and the rate of receiving aggression and between the GBI and HC levels. Thus, individuals receiving higher levels of aggression also tended to give grooming for relatively long periods compared to the time they were being groomed. In contrast, the rate of initiating aggression did not have a relationship with either HC levels or any measure of social grooming. We did not find social buffering effects, as there was no correlation between mutual social grooming and HC levels. These results show that not only aggressive interactions but also overall social situations in which animals do not have balanced relationships with others might result in the long-term elevation of cortisol levels in captive male chimpanzees.
著作権等: This is a post-peer-review, pre-copyedit version of an article published in 'Primates'. The final authenticated version is available online at: https://doi.org/10.1007/s10329-017-0641-8
The full-text file will be made open to the public on 15 December 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/235529
DOI(出版社版): 10.1007/s10329-017-0641-8
PubMed ID: 29247286
出現コレクション:学術雑誌掲載論文等

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