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Metabolic rate is negatively linked to adult survival but does not explain latitudinal differences in songbirds.
Ecology Letters ( IF 8.8 ) Pub Date : 2020-01-28 , DOI: 10.1111/ele.13464
Andy J Boyce 1 , James C Mouton 2 , Penn Lloyd 3 , Blair O Wolf 4 , Thomas E Martin 5
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Survival rates vary dramatically among species and predictably across latitudes, but causes of this variation are unclear. The rate-of-living hypothesis posits that physiological damage from metabolism causes species with faster metabolic rates to exhibit lower survival rates. However, whether increased survival commonly observed in tropical and south temperate latitudes is associated with slower metabolic rate remains unclear. We compared metabolic rates and annual survival rates that we measured across 46 species, and from literature data across 147 species of birds in northern, southern and tropical latitudes. High metabolic rates were associated with lower survival but survival varied substantially among latitudinal regions independent of metabolism. The inability of metabolic rate to explain latitudinal variation in survival suggests (1) species may evolve physiological mechanisms that mitigate physiological damage from cellular metabolism and (2) extrinsic rather than intrinsic sources of mortality are the primary causes of latitudinal differences in survival.

中文翻译:

代谢率与成年存活率负相关,但不能解释鸣禽的纬度差异。

物种之间的生存率差异很大,而且跨纬度也可以预测,但这种变化的原因尚不清楚。生存率假说认为,新陈代谢对生理的损害会导致新陈代谢率较高的物种表现出较低的生存率。然而,尚不清楚在热带和南部温带纬度地区通常观察到的生存增加是否与代谢速率降低有关。我们比较了我们测量的46种动物的代谢率和年生存率,以及来自北,南和热带纬度地区147种鸟类的文献数据。高代谢率与较低的存活率有关,但在与代谢无关的经纬度区域中,存活率差异很大。
更新日期:2020-01-29
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