Ageing in house sparrows is insensitive to environmental effects

Ageing in house sparrows is insensitive to environmental effects
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麻雀的衰老对环境影响不敏感

DOI:
10.1101/598284
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发表时间:
2019
期刊:
--
影响因子:
--
通讯作者:
Simons M
Simons M
中科院分区:
--
文献类型:
--
作者:
Simons M

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个体生活史和生理的变化决定了一个种群中新生命产生(繁殖)和丧失(死亡)的速度。因此,对死亡人口学的研究揭示了人口中个体生物学的基本方面。我们研究了野生麻雀和圈养麻雀(Passer domesticus)的死亡率衰老(死亡率随年龄增长而增加),结果表明两者的死亡率衰老程度非常相似,但圈养麻雀的死亡脆弱性(脆弱性)明显较低。这表明家雀有一种对环境影响不敏感的物种特有的衰老速度。出乎意料的是,在野外,幼鱼和成年鱼的死亡率在不同年份呈正相关,这表明死亡率并不强烈依赖于密度。死亡率在不同年份之间也有很大差异,这表明环境影响很大,我们使用温度数据和猛禽的捕食来解释观察到的模式。我们讨论了随机环境效应如何影响衰老的演变。
Variation in individual life histories, and physiology, determines the rates at which new life is generated (reproduction) and lost (death) in a population. Studying the demography of deaths thus reveals fundamental aspects of the biology of individuals within a population. We studied mortality senescence – the increase in mortality rate with age – in wild and captive house sparrows (Passer domesticus), and demonstrate highly similar mortality senescence in both, but markedly lower vulnerability to death (frailty) in captivity. This suggests that house sparrows have a species-specific rate of ageing that is insensitive to environmental effects. Unexpectedly, juvenile and adult mortality co-varied positively across years in the wild, indicating that mortality is not strongly density-dependent. Mortality also varied widely among years, suggesting a strong environmental effect, and we explain the observed patterns using temperature data and predation by birds of prey. We discuss how stochastic environmental effects can affect the evolution of ageing.
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