Social buffering of stress in a group-living fish

B. Culbert, K. Gilmour, S. Balshine
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引用次数: 32

Abstract

Living in groups affords individuals many benefits, including the opportunity to reduce stress. In mammals, such ‘social buffering’ of stress is mediated by affiliative relationships and production of the neuropeptide oxytocin, but whether these mechanisms facilitate social buffering across vertebrates remains an open question. Therefore, we evaluated whether the social environment influenced the behavioural and physiological recovery from an acute stressor in a group-living cichlid, Neolamprologus pulcher. Individual fish that recovered with their social group displayed lower cortisol levels than individuals that recovered alone. This social buffering of the stress response was associated with a tendency towards lower transcript abundance of arginine vasotocin and isotocin in the preoptic area of the brain, suggesting reduced neural activation of the stress axis. Individuals that recovered with their social group quickly resumed normal behaviour but received fewer affiliative acts following the stressor. Further experiments revealed similar cortisol levels between individuals that recovered in visual contact with their own social group and those in visual contact with a novel but non-aggressive social group. Collectively, our results suggest that affiliation and familiarity per se do not mediate social buffering in this group-living cichlid, and the behavioural and physiological mechanisms responsible for social buffering may vary across vertebrates.
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群居鱼对压力的社会缓冲
集体生活给个人带来很多好处,包括减少压力的机会。在哺乳动物中,这种压力的“社会缓冲”是由亲和关系和神经肽催产素的产生介导的,但这些机制是否促进了脊椎动物的社会缓冲仍然是一个悬而未决的问题。因此,我们评估了社会环境是否会影响群居稚鱼(Neolamprologus pulcher)在急性应激源后的行为和生理恢复。与社会群体一起康复的个体比单独康复的个体显示出更低的皮质醇水平。这种应激反应的社会缓冲与大脑视前区精氨酸血管催产素和异肽催产素转录丰度较低的趋势有关,表明应激轴的神经激活减少。与他们的社会群体恢复的个体很快恢复了正常的行为,但在压力源后得到的附属行为较少。进一步的实验表明,在与自己的社会群体进行视觉接触后恢复的个体与与一个新的但没有攻击性的社会群体进行视觉接触的个体之间的皮质醇水平相似。总的来说,我们的研究结果表明,亲缘关系和熟悉程度本身并不能调节这种群体生活的慈鲷的社会缓冲,负责社会缓冲的行为和生理机制可能因脊椎动物而异。
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