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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 30, No. 1, 2009, pp. 83-89
Bioline Code: zr09014
Full paper language: Chinese
Document type: Research Article
Document available free of charge

Zoological Research, Vol. 30, No. 1, 2009, pp. 83-89

 en Comparisons on Reproductive and Aggressive Behaviors in Male Tibetan Macaques ( Macaca thibetana check for this species in other resources ) of Two Different Operational Sex Ratio Troops at Huangshan, China
Wang, Xi; Li, Jin-hua; Xia, Dong-po; Chen, Ran; Zhu, Yong; Zhang, Min & Wang, Su

Abstract

Operational sex ratio (OSR) is the ratio of the number of sexually mature males to the estrous females, which is used to predict the intensity of sexual selection. During the mating season (August-December 2007), we studied reproductive and aggressive behaviors in sexually mature male Tibetan macaques ( Macaca thibetana check for this species in other resources ) in two troops (YA1 and YA2) at Huangshan, China. The behavioral data were collected by focal animal sampling, ad libitum sampling and continuous recording. The purpose is to discuss the impact of OSR on mating competition of male Tibetan macaques. The OSR of YA1 was 0.4:1, and the OSR of YA2 was 0.9:1. The male-biased in OSR of YA2 was higher than YA1. The sexually mature males of high rank in YA1 troop showed higher rates of reproductive behaviors than the males in YA2: genital-inspecting, grimace, sexual chase and mating, respectively (P<0.01). The sexually mature males of middle rank in YA1 troop showed higher rates of reproductive behaviors than the males in YA2: genital-inspecting, grimace, sexual chase (P<0.01). The sexually mature males of middle rank in YA1 troop also showed higher rate of mating behavior than the males in YA2 (P<0.05). However, there was no significant difference in reproductive behaviors between sexually mature males of low rank in two troops. The sexually mature males of high rank in YA2 troop showed higher rate of aggressive behavior than the males in YA1 (P<0.01). The sexually mature males of middle rank in YA2 troop showed higher rate of aggressive behavior than the males in YA1 (P<0.05). The sexually mature males of low rank in YA1 troop didn’t show any aggressive behavior. These results suggested that the intensification of male-biased in OSR can lead to the decrease of reproductive behaviors and the increase of aggressive behavior of male Tibetan macaques. The intensity of mating competition of sexually mature males in YA2 troop was stronger than the males in YA1. Our results support the prediction of the impact of OSR on mating competition by sexual selection theory.

Keywords
Tibetan macaques (Macaca thibetana); Operational sex ratio; Reproductive behavior; Aggressive behavior; Sexual selection theory

 
© Copyright 2009 Kunming Institute of Zoology, the Chinese Academy of Sciences
Alternative site location: http://www.zoores.ac.cn/

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