Aggression, segregation and stability in a dominance hierarchy
Aggression, segregation and stability in a dominance hierarchy
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DOI：
10.1098/rspb.2009.1839
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发表时间：
2010-05-07
影响因子：
4.7
通讯作者：
Manica, Andrea
中科院分区：
文献类型：
--
作者：
Ang, Tzo Zen;Manica, Andrea
我们理解社会群体形成和维持的核心问题是，在面对资源和再生产的不对称竞争时，如何实现群体内冲突的解决。许多处理生殖偏斜的冲突解决模型的一个关键而隐含的假设是，下属对自己与其统治者之间的冲突程度有着完美的了解，从而使行为反应在个体而不是进化尺度上。然而，一个机制，使下属能够准确地评估他们的相对冲突水平还有待实证证明。在这里，我们表明，在神仙鱼Centropyge双色的显性轻度侵略率从占主导地位的下属作为一个信号，增加等级冲突。这种信号的清晰度可以通过空间隔离来降低，从而导致下属不太能够通过调节其觅食率来做出适当的反应。减少的信号最终导致不太明确的统治等级和社会群体的不稳定。我们的研究表明，与以前的建议相反，显性攻击率作为偏斜模型进化稳定性所需的准确信息信号发挥着至关重要的作用。
Central to our understanding of social group formation and maintenance is the question of how within-group conflict resolution is achieved in the face of asymmetrical competition over resources and reproduction. A crucial yet implicit assumption of many conflict resolution models dealing with reproductive skew is that subordinates have perfect knowledge of the extent of conflict between themselves and their dominants, enabling behavioural responses on an individual rather than evolutionary scale. However, a mechanism enabling subordinates to accurately assess their relative conflict levels has yet to be empirically demonstrated. Here, we show in the angelfish Centropyge bicolor that the rate of overt mild aggression from dominants to subordinates acts as a signal of increasing rank conflict. The clarity of this signal can be reduced by spatial segregation, causing subordinates to be less able to respond appropriately by regulation of their foraging rates. A reduced signal ultimately leads to a less well-defined dominance hierarchy and destabilization of the social group. Our study suggests that, contrary to previous suggestions, dominant aggression rates play a crucial role as an accurate information signal required for the evolutionary stability of skew models.