Individual variation explains ageing patterns in a cooperatively breeding bird, the long-tailed tit Aegithalos caudatus.
Individual variation explains ageing patterns in a cooperatively breeding bird, the long-tailed tit Aegithalos caudatus.
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个体差异解释了合作繁殖的长尾山雀（Aegithalos caudatus）衰老模式。
DOI：
10.1111/1365-2656.13741
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发表时间：
2022-07
影响因子：
4.8
通讯作者：
Green, Jonathan P.
中科院分区：
文献类型：
--
作者：
Roper, Mark;Sturrock, Nicole J.;Hatchwell, Ben J.;Green, Jonathan P.
在合作繁殖物种中的同种异体照顾可能会改变繁殖者特定年龄的生存和繁殖以及随后的衰老。帮助行为本身也可能经历与年龄相关的变化，并且在兼性合作育种者中帮助的决定可能受到个体条件的影响。长尾山雀Aegithalos caudatus的助手在未能抚养自己的后代后帮助亲属，帮助巢的后代更有可能招募到繁殖种群中。利用25年来收集的数据，我们研究了成年长尾山雀生存和繁殖的年龄轨迹，以确定这些如何受到助手存在或不存在的影响，以及助手行为如何随年龄变化。有证据表明繁殖性能随饲养者年龄的增加而增加，但年龄对存活概率没有影响。我们没有发现生存或生殖能力显着衰老下降的证据，尽管个体在生命的最后一年积累了较少的包容性健身。终生生殖成功率与生殖寿命和体重呈正相关。在一个季节内，由助手协助的繁殖者通过在第二年加强后代招募而获得更大的繁殖成功。我们没有发现任何证据表明年龄会影响一个人的助人倾向，或者通过助人获得的间接健身量。我们发现寿命与生殖成功的多个组成部分之间存在正相关关系，这表明质量的个体差异支撑了该物种中与年龄相关的适应性变化。帮助决策是由条件驱动的，移民的终身包容性健身预测的身体质量。这些发现进一步支持个体质量异质性是长尾山雀整个生命过程中健身增益的主要驱动因素。在合作繁殖的成年长尾山雀中，帮手的存在或不存在如何影响生存和繁殖的年龄轨迹？利用25年来收集的数据，作者进行了第一次明确的测试，帮助行为的衰老。
Alloparental care in cooperatively breeding species may alter breeder age‐specific survival and reproduction and subsequently senescence. The helping behaviour itself might also undergo age‐related change, and decisions to help in facultative cooperative breeders are likely to be affected by individual condition. Helpers in long‐tailed tits Aegithalos caudatus assist relatives after failing to raise their own brood, with offspring from helped nests being more likely to recruit into the breeding population. Using data collected over 25 years, we examined the age trajectories of survival and reproduction in adult long‐tailed tits to determine how these were affected by the presence or absence of helpers and how helper behaviour changed with age. There was evidence for increased reproductive performance with breeder age, but no effect of age on the probability of survival. We found no evidence of significant senescent decline in survival or reproductive performance, although individuals accrued less inclusive fitness in their last year of life. Lifetime reproductive success was positively related to both reproductive life span and body mass. Within a season, breeders that were assisted by helpers enjoyed greater reproductive success through enhanced offspring recruitment in the following year. We found no evidence that age affected an individual's propensity to help, or the amount of indirect fitness accrued through helping. We found a positive correlation between life span and multiple components of reproductive success, suggesting that individual variation in quality underpins age‐related variation in fitness in this species. Helping decisions are driven by condition, and lifetime inclusive fitness of immigrants was predicted by body mass. These findings further support individual heterogeneity in quality being a major driver for fitness gains across the life course of long‐tailed tits. How does the presence or absence of helpers affect the age trajectories of survival and reproduction in cooperatively breeding adult long‐tailed tits? Using data collected over 25 years, the authors perform the first explicit test of senescence in helper behaviour.
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影响因子：
2
作者：
HAMILTON, WD
通讯作者：
HAMILTON, WD
影响因子：
6.6
作者：
Baudisch, Annette
通讯作者：
Baudisch, Annette
DOI：
10.1073/pnas.0711911105
发表时间：
2008-04-08
影响因子：
11.1
作者：
Cant, Michael A.;Johnstone, Rufus A.
通讯作者：
Johnstone, Rufus A.
影响因子：
1.7
作者：
Coulson, JC;Fairweather, JA
通讯作者：
Fairweather, JA
DOI：
10.1073/pnas.1815873115
发表时间：
2018-11-20
影响因子：
11.1
作者：
Green, Jonathan P.;Hatchwell, Ben J.
通讯作者：
Hatchwell, Ben J.