Consistent measures of oxidative balance predict survival but not reproduction in a long-distance migrant

1. Physiological processes, including those that disrupt oxidative balance, have been proposed as key to understanding fundamental life history trade-offs. Yet examination of changes in oxidative balance within wild animals across time, space and major life history challenges remain uncommon. For example, migration presents substantial physiological challenges for individuals, and data on migratory individuals would provide crucial context for exposing the importance of relationships between oxidative balance and fitness outcomes.
2. Here we examined the consistency of commonly used measures of oxidative balance in longitudinally sampled free-living individuals of a long-lived, long-distance migrant, the Brent goose Branta bernicla hrota over periods of months to years.
3. Although inter-individual and temporal variation in measures of oxidative balance were substantial, we found high consistency in measures of lipid peroxidation and circulating non-enzymatic antioxidants in longitudina...

1. 生理过程（包括破坏氧化平衡（oxidative balance）的过程）被视作理解基础生活史权衡（life history trade-offs）的关键所在。然而，针对野生动物在不同时间、空间跨度以及重大生活史挑战下的氧化平衡变化开展的研究仍相对稀缺。举例而言，迁徙会给个体带来显著的生理挑战，而有关迁徙个体的相关数据，可为揭示氧化平衡与适合度结果（fitness outcomes）之间关联的重要性提供关键背景信息。
2. 本研究针对一种长寿的长距离迁徙鸟类——布伦特黑雁（Branta bernicla hrota）的自由生活个体，在数月至数年的周期内开展纵向采样，以此检验常用氧化平衡测量指标的一致性。
3. 尽管氧化平衡的各项测量指标存在显著的个体间与时间维度变异，但我们发现，纵向采样下的脂质过氧化（lipid peroxidation）与循环性非酶抗氧化剂（circulating non-enzymatic antioxidants）指标具有较高一致性……