Incubation increases oxidative imbalance compared to chick rearing in a seabird, the Magellanic penguin (Spheniscus magellanicus)
Incubation increases oxidative imbalance compared to chick rearing in a seabird, the Magellanic penguin (Spheniscus magellanicus)
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DOI：
10.1007/s00227-017-3139-4
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发表时间：
2017-05-01
期刊：
影响因子：
2.4
通讯作者：
Barbosa, Andres
中科院分区：
文献类型：
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作者：
Colominas-Ciuro, Roger;Bertellotti, Marcelo;Barbosa, Andres
预计需要大量使用能量的活动可能产生更高的氧化应激。在本研究中，我们比较了两个繁殖期（孵化和小鸡饲养）与不同的精力充沛的需求在麦哲伦企鹅，预测更高的氧化不平衡在小鸡饲养，因为涉及更高的要求活动，如小鸡喂养和更大的巢保护比孵化期间。具体来说，我们预测更高的氧化损伤和较低的抗氧化防御在鸡饲养过程中比在孵化。在2014-2015年的繁殖季节期间，在位于阿根廷半岛巴尔德斯的埃斯坦西亚圣洛伦索（南纬42度05分，西经63度49分）的麦哲伦企鹅群中进行实地考察。令人惊讶的是，我们的结果并不支持我们最初的预测。孵化的成年鸡的氧化状态不平衡，抗氧化水平显着低于饲养雏鸡。此外，氧化损伤并没有表现出任何显着的变化之间的两个繁殖期。此外，我们没有发现性别之间的氧化状态的差异。我们的研究结果表明，孵化是一个非常苛刻的活动相比，小鸡饲养的氧化平衡，因为较低的抗氧化剂的存在可以解释为他们可能已经耗尽，以限制ROS的氧化损伤。差异觅食
It is expected that activities which require a high use of energy could generate higher oxidative stress. In the present study, we have compared two breeding periods (incubation and chick rearing) with different energetic demands in the Magellanic penguin, predicting a higher oxidative unbalance during chick rearing since involves higher demanding activities such as chick feeding and greater nest protection than during incubation. Specifically, we predicted higher oxidative damage and lower antioxidant defences during chick rearing than during incubation. Fieldwork was conducted in a Magellanic penguin colony located in Estancia San Lorenzo (42 degrees 05'S, 63 degrees 49'W), Peninsula Valdes, Argentina, during the breeding season of 2014-2015. Surprisingly, our results did not support our initial prediction. Incubating adults had their oxidative status unbalanced showing significantly lower antioxidant levels than those rearing chicks. Moreover, oxidative damage did not show any significant variation between both breeding periods. Further, we did not find differences in oxidative status between sexes. Our results suggest that incubation is a highly demanding activity compared to chick rearing in terms of oxidative balance since the lower presence of antioxidants can be explained as they have probably depleted to limit oxidative damage by ROS. Differential foraging