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Low-ranking individuals present high and unstable fecal cortisol levels in provisioned free-ranging adult male rhesus macaques (Macaca mulatta) during the birth season in a mountain area of northern China

  • Shiqiang Zhang
  • Zhenwei Cui
  • Yifeng Zhang
  • Baishi Wang
  • Meilin Zhu
  • Jiqi Lu
  • Zhenlong Wang
Original Article

Abstract

Social hierarchy commonly exists in animal societies, affecting both the endocrine functioning and the behavior of animals. In nonhuman primates, the relationship between social rank and cortisol levels varies across species and even within species. Here, we assessed the relationships between social rank and fecal cortisol levels in adult male Taihangshan macaques (rhesus macaques, Macaca mulatta tcheliensis) from the provisioned, free-ranging Wulongkou-2 (WLK-2) group inhabiting Wulongkou Scenic Area, Jiyuan, China. From March to May 2014, we recorded 195 agonistic behaviors and collected 54 fresh fecal samples from eight adult male Taihangshan macaques. Males were assigned a social rank according to an agonistic behavior matrix, and enzyme-linked immunosorbent assay was then used to measure the cortisol concentration in the fecal samples. We found that social rank among the eight male Taihangshan macaques in WLK-2 group followed a strict linear hierarchy, and that fecal cortisol levels were significantly higher and more variable in low-ranking males than in more dominant individuals. Age was not significantly associated with social rank or fecal cortisol levels. Our results suggest that social rank and maintenance of the social hierarchy within the WLK-2 group is a chronic stressor, with low-ranking males maintaining heightened stress levels and enlarged reactive scope relative to dominant males. This provides new support for the theory that social environment can influence endocrine functioning.

Keywords

Cortisol Rhesus macaques (Macaca mulatta tcheliensisSocial rank Stress 

Notes

Acknowledgements

Thanks for the permission and support of Taihangshan Macaque National Nature Reserve throughout this study. Thanks to the National Natural Science Foundation of China (31472018, 31372193). We are grateful to Mr. Kuang Sanao, Mr. Kuang Zhenjing and Mr. Kang Yali for the help in the field. Moreover, thanks the reviewers and editors for the comments, which helped us to improve the manuscript.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

Ethical approval

The methods for sampling behaviors and collecting fecal samples used in this study conformed to the guidelines of the China Practice for the Care and Use of Laboratory Animals, and followed protocols approved by the Ethics Committee of Zhengzhou University.

Supplementary material

10329_2018_692_MOESM1_ESM.docx (13 kb)
Supplementary material 1 (DOCX 13 kb)

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Copyright information

© Japan Monkey Centre and Springer Japan KK, part of Springer Nature 2018

Authors and Affiliations

  1. 1.School of Life SciencesZhengzhou UniversityZhengzhouChina
  2. 2.School of Basic Medical SciencesZhengzhou UniversityZhengzhouChina
  3. 3.Charles Perkins CentreUniversity of SydneySydneyAustralia
  4. 4.Sydney Medical SchoolUniversity of SydneySydneyAustralia
  5. 5.Institute of Forensic ScienceMinistry of Public SecurityBeijingChina

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