Contrasting drivers of reproductive ageing in albatrosses.
Contrasting drivers of reproductive ageing in albatrosses.
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DOI：
10.1111/1365-2656.12712
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发表时间：
2017-09
期刊：
影响因子：
--
通讯作者：
Phillips RA
中科院分区：
文献类型：
--
作者：
Froy H;Lewis S;Nussey DH;Wood AG;Phillips RA
与年龄相关的生殖能力变化在野生脊椎动物种群中普遍存在，并对种群和进化动力学产生重要影响。衰老的轨迹是由个体内部的过程，如改善和衰老，以及选择性出现和消失的个体之间的影响形成的。到目前为止，很少有研究比较这些不同的驱动因素在物种或种群之间的作用。在这项研究中，我们使用近40年的纵向监测数据来对比三种信天翁（两种两年生和一种一年生繁殖者）的生殖衰老模式的个体内和个体间过程，并测试这些是否可以通过生活史的差异来解释。所有物种的早期表现均随年龄增长而增加，主要受个体内改善的影响。然而，只有两个物种中检测到生殖衰老。在表现出衰老衰退的物种中，我们还发现了育种成功的终端改进。这暗示了繁殖和生存之间的权衡，这得到了良好繁殖者选择性消失的证据的支持。我们表明，比较密切相关的物种，不同的具体方面，他们的生活史可以揭示生态和进化的力量塑造变化的老化模式。
Age‐related variation in reproductive performance is ubiquitous in wild vertebrate populations and has important consequences for population and evolutionary dynamics. The ageing trajectory is shaped by both within‐individual processes, such as improvement and senescence, and the among‐individual effects of selective appearance and disappearance. To date, few studies have compared the role of these different drivers among species or populations. In this study, we use nearly 40 years of longitudinal monitoring data to contrast the within‐ and among‐individual processes contributing to the reproductive ageing patterns in three albatross species (two biennial and one annual breeder) and test whether these can be explained by differences in life histories. Early‐life performance in all species increased with age and was predominantly influenced by within‐individual improvements. However, reproductive senescence was detected in only two of the species. In the species exhibiting senescent declines, we also detected a terminal improvement in breeding success. This is suggestive of a trade‐off between reproduction and survival, which was supported by evidence of selective disappearance of good breeders. We demonstrate that comparisons of closely related species which differ in specific aspects of their life history can shed light on the ecological and evolutionary forces shaping variation in ageing patterns.
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