Department of Integrative Biology, The University of Texas at Austin, Austin, TX 78712.
Institute for Neuroscience, The University of Texas at Austin, Austin, TX 78712.
Proc Natl Acad Sci U S A. 2020 Aug 4;117(31):18566-18573. doi: 10.1073/pnas.2000158117. Epub 2020 Jul 16.
Dominant individuals are often most influential in their social groups, affecting movement, opinion, and performance across species and contexts. Yet, behavioral traits like aggression, intimidation, and coercion, which are associated with and in many cases define dominance, can be socially aversive. The traits that make dominant individuals influential in one context may therefore reduce their influence in other contexts. Here, we examine this association between dominance and influence using the cichlid fish , comparing the influence of dominant and subordinate males during normal social interactions and in a more complex group consensus association task. We find that phenotypically dominant males are aggressive, socially central, and that these males have a strong influence over normal group movement, whereas subordinate males are passive, socially peripheral, and have little influence over normal movement. However, subordinate males have the greatest influence in generating group consensus during the association task. Dominant males are spatially distant and have lower signal-to-noise ratios of informative behavior in the association task, potentially interfering with their ability to generate group consensus. In contrast, subordinate males are physically close to other group members, have a high signal-to-noise ratio of informative behavior, and equivalent visual connectedness to their group as dominant males. The behavioral traits that define effective social influence are thus highly context specific and can be dissociated with social dominance. Thus, processes of hierarchical ascension in which the most aggressive, competitive, or coercive individuals rise to positions of dominance may be counterproductive in contexts where group performance is prioritized.
优势个体通常在其社会群体中最具影响力,影响着跨越物种和环境的运动、意见和表现。然而,与优势相关且在许多情况下定义优势的行为特征,如攻击性、恐吓和胁迫,可能在社会上是不受欢迎的。在一种情况下使优势个体具有影响力的特征,可能会降低他们在其他情况下的影响力。在这里,我们使用丽鱼科鱼类来研究这种优势和影响力之间的关联,比较了优势和劣势雄性在正常社交互动和更复杂的群体共识关联任务中的影响力。我们发现,表型优势雄性具有攻击性、社交中心地位,这些雄性对正常群体运动具有强大的影响力,而劣势雄性则是被动的、社交边缘的,对正常运动几乎没有影响力。然而,在关联任务中,劣势雄性在产生群体共识方面具有最大的影响力。优势雄性在空间上距离较远,并且在关联任务中的信息性行为的信号噪声比低,这可能会干扰他们产生群体共识的能力。相比之下,劣势雄性在身体上靠近其他群体成员,具有较高的信息性行为信号噪声比,并且与优势雄性具有同等的视觉连通性。因此,定义有效社会影响力的行为特征在高度特定的情境中是不同的,并且可以与社会优势区分开来。因此,在优先考虑群体表现的情况下,等级上升过程中,最具攻击性、竞争力或胁迫性的个体上升到优势地位,可能会适得其反。