The role of humidity and metabolic status on lean mass catabolism in migratory Swainson's thrushes (Catharus ustulatus)

D. Groom, J. Deakin, M. C. Lauzau, A. Gerson
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引用次数: 6

Abstract

Migratory birds use protein as a fuel source during flight, but the mechanisms and benefits of protein catabolism during migration are poorly understood. The tissue-specific turnover rate hypothesis proposes that lean mass loss depends solely on the constitutive rate of protein degradation for a given tissue, and is therefore independent of metabolic rate or environmental stimuli. However, it has been demonstrated that environmental stressors such as humidity affect the rate of lean mass catabolism during flight, a finding that seemingly contradicts the tissue-specific turnover rate hypothesis. In order to resolve this, we placed migratory Swainson's thrushes in either high (HEWL) or low (LEWL) evaporative water loss conditions at rest and while undergoing simulated migratory flight at 8 m s−1 in a wind tunnel to test the impact of both environmental stressors and metabolic rate on the rate of protein breakdown. The total quantity and rate of lean mass loss was not different between flight and rest birds, but was affected by humidity condition, with HEWL losing significantly more lean mass. These results show that the rate of protein breakdown in migratory birds is independent of metabolic rate, but it can be augmented in response to environmental stressors.
湿度和代谢状态对候鸟瘦体分解代谢的影响
候鸟在飞行过程中使用蛋白质作为燃料来源,但在迁徙过程中蛋白质分解代谢的机制和益处尚不清楚。组织特异性周转率假说提出,瘦质量损失仅取决于特定组织的蛋白质降解构成率,因此与代谢率或环境刺激无关。然而,有研究表明,环境压力因素(如湿度)会影响飞行过程中瘦质量分解代谢的速度,这一发现似乎与组织特异性周转率假说相矛盾。为了解决这个问题,我们将迁徙的斯温森画眉置于高(hel)或低(LEWL)蒸发失水条件下休息,同时在风洞中进行8 m s - 1的模拟迁徙飞行,以测试环境压力源和代谢率对蛋白质分解率的影响。瘦质量损失的总量和速度在飞行和休息的鸟类之间没有差异,但受湿度条件的影响,HEWL的瘦质量损失明显更多。这些结果表明,候鸟的蛋白质分解速率与代谢速率无关,但它可以在环境应激条件下增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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