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

Overview

Journal Primates

Specialty Biology

Date 2018 Oct 10

PMID 30298460

Citations 3

Authors

Shiqiang Zhang

Zhenwei Cui

Yifeng Zhang

Baishi Wang

MeiLin Zhu

Jiqi Lu

Zhenlong Wang

Affiliations

Soon will be listed here.

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.

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