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Differences in oxidative stress across seasons and ability to cope with environmental mismatch in muscle and brain of black‐capped chickadees Poecile atricapillus and rock pigeons Columba livia
Journal of Avian Biology ( IF 1.7 ) Pub Date : 2020-05-09 , DOI: 10.1111/jav.02417
Ana Gabriela Jimenez 1 , Kailey J. Tobin 1 , Katherine N. Anderson 1 , MaryKathryn E. McCann 1 , Christopher W. Briggs 2
Affiliation  

Resident birds in temperate areas respond to seasonally fluctuating temperatures by adjusting their physiology so as to match thermogenic requirements of their environment. Climate change is predicted to increase the frequency of heat waves, increasing the likelihood that birds will face environmental mismatch. Changes in BMR due to seasonality or anomaly events should show effects to the oxidative stress system. We examined the effects of chronic and acute heat exposure on muscle and brain tissue total antioxidant capacity, enzymatic activities of catalase (CAT) and glutathione peroxidase (GPx) and lipid peroxidation (LPO) damage in two temperate bird species of differing body masses and ecological strategies, the black‐capped chickadee Poecile atricapillus and the rock pigeon Columba livia, across three seasons. We found that heat stress did not alter oxidative stress in either species or tissue. But, in muscle, rock pigeons and black‐capped chickadees demonstrated similar seasonal changes where peroxyl scavenging capacity was highest in the fall, hydroxyl scavenging capacity was higher in fall and summer. CAT activity was lowest in the fall and highest in the summer, GPx activity was highest in the fall, and LPO damage was highest in the summer but lowest in the fall. In brain, we found that scavenging capacity to hydroxyl radicals was highest in fall and summer for rock pigeons, whereas it was only elevated in the summer for black‐capped chickadees. Our data suggest that the oxidative stress system is slow to change seasonally.

中文翻译:

黑冠山雀Poecile atricapillus和原鸽Columba livia在整个季节的氧化应激差异以及应对肌肉和大脑环境失配能力的差异

温带地区的鸟类通过调节生理机能来应对季节性波动的温度,以适应其环境的生热要求。预计气候变化将增加热浪的频率,增加鸟类面临环境失配的可能性。由于季节性或异常事件导致的BMR变化应显示对氧化应激系统的影响。我们检查了慢性和急性热暴露对两种不同体重和生态温带鸟类的肌肉和脑组织总抗氧化能力,过氧化氢酶(CAT)和谷胱甘肽过氧化物酶(GPx)的酶活性以及脂质过氧化(LPO)损伤的影响。策略,黑顶山雀Poecile atricapillus和原鸽Columba livia,跨越三个季节。我们发现,热应激不会改变物种或组织中的氧化应激。但是,在肌肉,原鸽和黑冠山雀中表现出相似的季节性变化,其中秋天的过氧清除能力最高,秋天和夏天的清除羟能力较高。CAT活性在秋季最低,夏季最高,GPx活性在秋季最高,LPO损害在夏季最高,但在秋季最低。在大脑中,我们发现原鸽在秋季和夏季对羟自由基的清除能力最高,而在黑冠山雀中,这种清除能力仅在夏季升高。我们的数据表明氧化应激系统的季节性变化缓慢。
更新日期:2020-05-09
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