Fecundity and survival in relation to resistance to oxidative stress in a free-living bird
Fecundity and survival in relation to resistance to oxidative stress in a free-living bird
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DOI：
10.1890/07-1135.1
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发表时间：
2008-09-01
期刊：
影响因子：
4.8
通讯作者：
Christe, Philippe
中科院分区：
文献类型：
--
作者：
Bize, Pierre;Devevey, Godefroy;Christe, Philippe
主要的生活史特征，如繁殖力和存活率，在自然界中一直被证明是积极的共变，一些个体比其他人拥有更多的资源来分配他们生活史的各个方面。然而，对于哪些资源（或状态变量）可以解释这种协变，我们知之甚少。活性氧（ROS）是新陈代谢的天然副产物，当ROS的产生超过抗氧化防御时，生物体暴露于氧化应激，这可能对其繁殖力和生存产生有害影响。我们使用一种长寿的野生鸟类——高山雨燕（Apus melba），研究了个体红细胞对氧化应激的抵抗力是否与繁殖力和存活率共变。我们发现，存活到下一个繁殖季节的雄性往往更能抵抗氧化应激，而抗氧化应激能力越强的雌性产卵量越大。此外，抗氧化应激能力低的雌卵孵化率低于抗氧化应激能力高的雌卵孵化率。通过在孵化完成时交换整个卵，我们证明了孵化失败与氧化应激抵抗力低的雌性产卵质量低有关，而不是与孵化期间亲代照顾不足有关。尽管雄性和雌性对氧化应激的抵抗力随年龄而变化，但氧化应激、存活率和繁殖力之间的关系与实足年龄无关。总的来说，我们的研究表明，氧化应激可能在塑造野外繁殖力和生存方面发挥重要作用。这进一步表明，氧化应激抗性与生活史性状之间的共变本质是性别特异性的，高氧化应激抗性主要与雌性的繁殖力和雄性的存活率共变。
Major life history traits, such as fecundity and survival, have been consistently demonstrated to covary positively in nature, some individuals having more resources than others to allocate to all aspects of their life history. Yet, little is known about which resources (or state variables) may account for such covariation. Reactive oxygen species (ROS) are natural by-products of metabolism and, when ROS production exceeds antioxidant defenses, organisms are exposed to oxidative stress that can have deleterious effects on their fecundity and survival. Using a wild, long-lived bird, the Alpine Swift (Apus melba), we examined whether individual red cell resistance to oxidative stress covaried with fecundity and survival. We found that males that survived to the next breeding season tended to be more resistant to oxidative stress, and females with higher resistance to oxidative stress laid larger clutches. Furthermore, the eggs of females with low resistance to oxidative stress were less likely to hatch than those of females with high resistance to oxidative stress. By swapping entire clutches at clutch completion, we then demonstrated that hatching failure was related to the production of low-quality eggs by females with low resistance to oxidative stress, rather than to inadequate parental care during incubation. Although male and female resistance to oxidative stress covaried with age, the relationships among oxidative stress, survival, and fecundity occurred independently of chronological age. Overall, our study suggests that oxidative stress may play a significant role in shaping fecundity and survival in the wild. It further suggests that the nature of the covariation between resistance to oxidative stress and life history traits is sex specific, high resistance to oxidative stress covarying primarily with fecundity in females and with survival in males.