Intra-group social stability is important for the long-term productivity and health of social organisms. We evaluated the effect of group size on group stability in the face of repeated social perturbations using a cooperatively breeding fish, Neolamprologus pulcher In a laboratory study, we compared both the social and physiological responses of individuals from small versus large groups to the repeated removal and replacement of the most dominant group member (the breeder male), either with a new male (treatment condition) or with the same male (control condition). Individuals living in large groups were overall more resistant to instability but were seemingly slower to recover from perturbation. Members of small groups were more vulnerable to instability but recovered faster. Breeder females in smaller groups also showed greater physiological preparedness for instability following social perturbations. In sum, we discover both behavioral and physiological evidence that living in larger groups helps to dampen the impacts of social instability in this system.

译文

:群体内部的社会稳定对社会有机体的长期生产力和健康至关重要。我们使用合作繁殖的鱼类Neolamprologus pulcher评估了面对反复的社会动荡时,群体规模对群体稳定性的影响。在一项实验室研究中,我们比较了小型和大型群体个体的社会和生理反应与重复去除和用新的雄性(治疗条件)或相同的雄性(对照条件)替换最主要的组成员(育种雄性)。整体而言,生活在较大群体中的个体对不稳定的抵抗力更大,但从动荡中恢复的速度似乎较慢。小组成员更容易受到不稳定的影响,但恢复得更快。较小群体的母鸡也表现出更大的生理上的准备,以应对社会动荡后的不稳定性。总之,我们发现行为和生理证据都表明,生活在较大的群体中有助于减轻该系统中社会不稳定的影响。

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