Stopovers Serve Physiological Recovery in Migratory Songbirds.

IF 1.8 3区 生物学 Q3 PHYSIOLOGY Physiological and Biochemical Zoology Pub Date : 2023-09-01 Epub Date: 2023-08-21 DOI:10.1086/726788
Cas Eikenaar, Alessia Ostolani, Sven Hessler, Ellen Y Ye, Thiemo Karwinkel, Caroline Isaksson
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Abstract

AbstractMigrating birds perform extreme endurance exercise when flying. This shifts the balance between the production of reactive oxygen species and the antioxidant defense system toward the former, potentially generating oxidative damages. In between migratory flights, birds make stopovers, where besides accumulating fuel (mainly fats), they are assumed to rest and recover from the strenuous flight. We performed a series of studies on both temporarily caged (northern wheatears) and free-flying (northern wheatears and European robins) migrants to investigate whether migrants recover during stopover by decreasing the amount of oxidative lipid damage (malondialdehyde [MDA]) and/or increasing the total nonenzymatic antioxidant capacity (AOX). In caged wheatears, MDA decreased within a single day. These birds were able to simultaneously accumulate considerable amounts of fuel. Also, in the free-flying wheatears, there was a decrease in MDA during stopover; however, this process seemed incompatible with refueling. The reason for this difference could relate to constraints in the wild that are absent in caged birds, such as food limitation/composition and locomotor activity. In the robins, there was a near significant decrease in MDA concentration in relation to how long the birds were already at stopover, suggesting that this species also physiologically recovers during stopover. AOX did not change during stopover in either of the wheatear studies. For the robins, however, uric acid-corrected AOX declined during stopover. Our results show that during stopover, migrating birds rapidly reduce oxidative lipid damage, thereby likely recovering their physiological state. In addition to the commonly accepted function of refueling, stopovers thus probably serve physiological recovery.

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中途停留为候鸟的生理恢复服务。
候鸟在飞行时进行极限耐力训练。这将活性氧的产生和抗氧化防御系统之间的平衡转移到前者,可能产生氧化损伤。在迁徙飞行之间,鸟类会中途停留,在那里除了积累燃料(主要是脂肪)外,它们还会休息并从剧烈的飞行中恢复。我们对暂时关在笼子里的(北方麦穗)和自由飞行的(北方小麦穗和欧洲知更鸟)迁徙者进行了一系列研究,以调查迁徙者在中途停留期间是否通过减少氧化脂质损伤(丙二醛[MDA])和/或增加总非酶抗氧化能力(AOX)而恢复。笼养小麦穗中MDA含量在一天内下降。这些鸟能够同时积累大量的燃料。此外,在自由飞行小麦穗中,MDA在中途停留期间降低;然而,这一过程似乎与加油不相容。这种差异的原因可能与笼中鸟类所缺乏的野外限制有关,如食物限制/成分和运动活动。在知更鸟身上,MDA浓度与鸟类在中途停留的时间有关,几乎显著降低,这表明该物种在中途停留期间也会恢复生理状态。在两项小麦穗研究中,AOX在中途停留期间均未发生变化。然而,对于知更鸟来说,尿酸校正后的AOX在中途停留期间下降。我们的研究结果表明,在中途停留期间,候鸟可以迅速减少氧化性脂质损伤,从而可能恢复其生理状态。除了通常接受的加油功能外,中途停留可能有助于生理恢复。
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来源期刊
CiteScore
3.20
自引率
6.20%
发文量
62
审稿时长
6-12 weeks
期刊介绍: Physiological and Biochemical Zoology: Ecological and Evolutionary Approaches primarily publishes original research in animal physiology and biochemistry as considered from behavioral, ecological, and/or evolutionary perspectives. Studies at all levels of biological organization from the molecular to the whole organism are welcome, and work that integrates across levels of organization is particularly encouraged. Studies that focus on behavior or morphology are welcome, so long as they include ties to physiology or biochemistry, in addition to having an ecological or evolutionary context. Subdisciplines of interest include nutrition and digestion, salt and water balance, epithelial and membrane transport, gas exchange and transport, acid-base balance, temperature adaptation, energetics, structure and function of macromolecules, chemical coordination and signal transduction, nitrogen metabolism and excretion, locomotion and muscle function, biomechanics, circulation, behavioral, comparative and mechanistic endocrinology, sensory physiology, neural coordination, and ecotoxicology ecoimmunology.
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