Dominance hierarchy and social network in a captive group of white-lipped peccary males: what happens after the alpha male leaves?

IF 1.1 4区 生物学 Q4 BEHAVIORAL SCIENCES acta ethologica Pub Date : 2021-09-29 DOI:10.1007/s10211-021-00386-7
Laís Aline Grossel, Manoel Lucas Javorouski, Nei Moreira, Emygdio Leite de Araujo Monteiro-Filho
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引用次数: 1

Abstract

Dominance hierarchies are typically stable, with dominants occupying central positions in social interaction networks. However, system perturbations, such as the removal of individuals, may cause instability, which varies according to the group’s resilience. If the hierarchy undergoes a restructuring, this can occur through a dynamic process of self-organization (Social Dynamics hypothesis) or through the influence of individuals’ attributes (Previous Attributes hypothesis). We analyzed the resilience of the white-lipped peccary hierarchy after the alpha’s death and observed how the rise of a new dominant occurred. Additionally, we evaluated the validity of these two hypotheses in the restructuring of the system. We observed the group of white-lipped peccary males of the Municipal Zoo of Curitiba, PR, Brazil, from May to October 2018. We recorded and analyzed the agonistic and affiliative interactions, and we collected data from the attributes: weight, testicle size, testosterone serum and age, before and after the dominant’s death (August). Due to this perturbation, the hierarchy started to show instability, but proved to be resilient. There was an increase in agonism and more than one individual pleading for the new dominant position, which was occupied by a subordinate male. Affiliative interactions were also important in the rise of the new alpha. The hierarchy was well ordered by the social dynamics among individuals, but weight and testicular volume were also correlated with the status of the individuals before, and with the serum testosterone after the alpha’s death. Thus, both hypotheses affected the restructuring of this system.

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圈养的白唇山核桃雄性群体的统治等级和社会网络:雄性首领离开后会发生什么?
支配等级通常是稳定的,支配者在社会互动网络中占据中心位置。然而,系统扰动,例如个体的移除,可能会导致不稳定,这取决于群体的恢复能力。如果层级结构经历重构,这可能通过自我组织的动态过程(社会动力学假说)或通过个体属性的影响(先前属性假说)发生。我们分析了在首领死后白唇金钱阶层的恢复力,并观察了一个新的统治阶层是如何崛起的。此外,我们评估了这两个假设在系统重组中的有效性。2018年5月至10月,我们观察了巴西库里蒂巴市立动物园的一群白唇雄pecary。我们记录并分析了拮抗性和亲和性的相互作用,并收集了优势体死亡前后(8月)的属性数据:体重、睾丸大小、睾酮血清和年龄。由于这种扰动,层次结构开始表现出不稳定性,但被证明是有弹性的。竞争加剧,而且不止一个个体在争夺新的统治地位,而这一地位是由一个从属的雄性占据的。在新阿尔法的兴起中,亲和互动也很重要。个体之间的社会动态对等级排序很好,但体重和睾丸体积也与个体在阿尔法死亡前的地位相关,与阿尔法死亡后的血清睾酮水平相关。因此,这两种假设都影响了这一制度的重组。
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来源期刊
acta ethologica
acta ethologica 生物-动物学
CiteScore
1.90
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: acta ethologica publishes empirical and theoretical research papers, short communications, commentaries, reviews and book reviews as well as methods papers in the field of ethology and related disciplines, with a strong concentration on the behavior biology of humans and other animals. The journal places special emphasis on studies integrating proximate (mechanisms, development) and ultimate (function, evolution) levels in the analysis of behavior. Aspects of particular interest include: adaptive plasticity of behavior, inter-individual and geographic variations in behavior, mechanisms underlying behavior, evolutionary processes and functions of behavior, and many other topics. acta ethologica is an official journal of ISPA, CRL and the Portuguese Ethological Society (SPE)
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