Revisiting the link between breeding effort and oxidative balance through field evaluation of two sympatric sibling insect species
Revisiting the link between breeding effort and oxidative balance through field evaluation of two sympatric sibling insect species
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通过对两种同域同胞昆虫物种的现场评估，重新审视育种努力与氧化平衡之间的联系
DOI：
10.1111/evo.12586
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发表时间：
2015
期刊：
影响因子：
3.3
通讯作者：
S. Venner
中科院分区：
文献类型：
--
作者：
B. Rey;Pierre;M. Bel‐Venner;Y. Voituron;S. Venner
氧化应激可能是控制进化权衡的主要力量的观点最近受到实验室条件下实验方法的挑战，引发了围绕理论和方法问题的广泛辩论。在这里，我们通过测量野生捕获的两种同级象鼻虫（Curculio elephas、C. mudaium）雌性的多种抗氧化和氧化损伤，重新审视了氧化应激与繁殖之间的联系。我们研究的优势在于（1）研究的物种同域并利用相似的资源，但表现出截然不同的繁殖策略；（2）在整个成年生活中对个体进行采样，以便将氧化状态与繁殖努力联系起来。我们发现，寿命较短的象象在出现后会牺牲氧化还原稳态来立即繁殖，其特点是抗氧化防御能力低和氧化损伤升高。相比之下，腺球菌大量投入抗氧化剂并保持较低的氧化损伤，这可能有助于延长它们的繁殖前期。有趣的是，我们还首次在实地研究中发现，随着繁殖的开始，抗氧化防御系统意外地重新激活。因此，我们的结果支持氧化应激和生活史进化之间存在强大但复杂的关系，并强调需要更精细地描述抗氧化策略。
The idea that oxidative stress could be a major force governing evolutionary trade‐offs has recently been challenged by experimental approaches in laboratory conditions, triggering extensive debates centered on theoretical and methodological issues. Here, we revisited the link between oxidative stress and reproduction by measuring multiple antioxidant and oxidative damages in wild‐caught females of two sibling weevil species (Curculio elephas, C. glandium). The strength of our study arised from (1) studied species that were sympatric and exploited similar resource, but displayed contrasting reproductive strategies and (2) individuals were sampled throughout adult life so as to relate oxidative status to breeding effort. We found that the short‐lived C. elephas sacrifices red‐ox homeostasis for immediate reproduction upon emergence as characterized by low antioxidant defenses and elevated oxidative damage. Comparatively, C. glandium massively invests in antioxidant and maintains low oxidative damage, which may contribute to their extended prereproductive period. Intriguingly, we also reveal, for the first time in a field study, an unexpected reactivation of antioxidant defenses with the onset of reproduction. Our results thus support the existence of a strong, but complex relationship between oxidative stress and life‐history evolution and highlight the need for a finer‐scale picture of antioxidant strategies.