Females pay the oxidative cost of dominance in a highly social bird
Females pay the oxidative cost of dominance in a highly social bird
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在高度社会化的鸟类中，雌性付出了统治地位的氧化成本
DOI：
10.1016/j.anbehav.2018.08.006
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发表时间：
2018
期刊：
影响因子：
2.5
通讯作者：
R. Covas
中科院分区：
文献类型：
--
作者：
Liliana R. Silva;Sophie Lardy;André C. Ferreira;B. Rey;C. Doutrelant;R. Covas
理解社会行为的进化和维持需要更好地理解社会地位的利益和成本之间权衡的生理机制。社会支配地位预计将在获得资源和生殖方面提供优势，但获得和维持支配地位也可能需要付出生理代价。支配型个体可能更频繁地参与攻击性行为和/或可能分配大量的能量和资源来表明他们的地位。因此，优势可能涉及多种生理过程，刺激有氧代谢，并导致活性氧（ROS）的产生。当没有耗尽时，ROS最终会导致氧化应激。然而，氧化状态和优势之间的关系很少被调查。在这里，我们研究了是否有一个生理成本，衡量为氧化应激，与优势在一个高度社会性和合作的鸟，社会性织布，Philetairus socius。通过测量循环氧化损伤和血浆非特异性抗氧化能力来评估氧化状态。我们发现，在女性中，但不是在男性中，优势与更高水平的氧化损伤比同性下属，这表明，生理成本的优势是由氧化应激的性别特异性的方式。这种相关的优势成本是独立的以前和未来的生殖状态。氧化损伤的性别差异与抗氧化防御的性别特异性差异有关，男性（占主导地位的性别）表现出比女性更高的抗氧化水平，独立于他们的社会地位。这些发现表明，社会主导地位可能需要以性别特异性的方式在优势和生理成本之间进行权衡，使女性面临氧化应激。这种情况可能会在紧张时期加剧，例如粮食短缺的干旱时期，它对理解女性健康、老龄化和寿命有影响。
Understanding the evolution and maintenance of social behaviour requires a better understanding of the physiological mechanisms underlying the trade-offs between the benefits and costs of social status. Social dominance is expected to provide advantages in terms of access to resources and to reproduction but acquiring and maintaining dominance may also entail physiological costs. Dominant individuals are likely to engage more frequently in aggressive behaviours and/or may allocate a substantial amount of energy and resources to signal their status. Hence, dominance is likely to involve multiple physiological processes that stimulate aerobic metabolism and lead to the generation of reactive oxygen species (ROS). When not depleted, ROS can ultimately lead to oxidative stress. However, the relationship between oxidative status and dominance has seldom been investigated. Here, we examined whether there is a physiological cost, measured as oxidative stress, associated with dominance in a highly social and cooperative bird, the sociable weaver,Philetairus socius. Oxidative status was assessed by measuring circulating oxidative damage and the plasma nonspecific antioxidant capacity. We found that in females, but not in males, dominance was associated with higher levels of oxidative damage than in same-sex subordinates, suggesting that the physiological cost of dominance is underpinned by oxidative stress in a sex-specific manner. This associated cost of dominance was independent of previous and future reproductive status. The sex difference in oxidative damage was associated with sex-specific differences in antioxidant defences, with males (the dominant sex) showing higher antioxidant levels than females, independently of their social rank. These findings indicate that social dominance may entail a trade-off between advantages and physiological costs in a sex-specific manner, exposing females to oxidative stress. This scenario may be aggravated during stressful periods, such as drought episodes when food is scarce, and it has implications for understanding female health, ageing and life span.
合作雀形目动物中的优势等级和相关信号
影响因子：
2.3
作者：
Rat M
通讯作者：
Rat M
当前与未来的繁殖和寿命：对预测和机制的重新评估
影响因子：
2.8
作者：
Zhang, Yufeng;Hood, Wendy R.
通讯作者：
Hood, Wendy R.