Fitness prospects: effects of age, sex and recruitment age on reproductive value in a long-lived seabird.
Fitness prospects: effects of age, sex and recruitment age on reproductive value in a long-lived seabird.
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健康前景：年龄、性别和补充年龄对长寿海鸟繁殖价值的影响。
DOI：
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发表时间：
2015
影响因子：
4.8
通讯作者：
S. Bouwhuis
中科院分区：
文献类型：
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作者：
He Zhang;Maren Rebke;P. Becker;S. Bouwhuis
生殖价值是了解生活史进化和种群动态的基础，是衡量生存和生殖的综合指标，但对生殖价值的种内差异和解释这种差异的因素(如果有的话)知之甚少。通过将广义加性混合模型应用于普通燕鸥的纵向个体数据，我们估计了特定年龄的年存活概率、繁殖概率和繁殖性能，并在此基础上计算了特定年龄的繁殖值。我们调查了性别和征兵年龄(RA)对每个特征的影响。我们发现年龄对所有性状都有影响，存活率和繁殖率随着年龄的增加而下降，而繁殖性能首先随着年龄的增加而提高，然后趋于平稳。我们只发现性别对存活概率的影响非常小，略显着，但有证据表明，RA患者的特定年龄繁殖概率和生殖性能会降低。因此，雄性的特定年龄繁殖价值略低于雌性，而在最早2岁和3岁时招募的雌鸟(即燕鸥种群的54%)比在较晚年龄招募的鸟类具有更高的健康前景。虽然RA对繁殖概率和繁殖性能的影响在统计上是显著的，但这些影响还不够大，不足以转化为对繁殖价值的显著影响。年龄特定的生殖价值为衰老提供了证据，性别-RA组的健康成本在17%-21%的范围内。我们的研究表明，繁殖价值可能存在种内变异，但在一般情况下，差异很小。
Reproductive value is an integrated measure of survival and reproduction fundamental to understanding life-history evolution and population dynamics, but little is known about intraspecific variation in reproductive value and factors explaining such variation, if any. By applying generalized additive mixed models to longitudinal individual-based data of the common tern Sterna hirundo, we estimated age-specific annual survival probability, breeding probability and reproductive performance, based on which we calculated age-specific reproductive values. We investigated effects of sex and recruitment age (RA) on each trait. We found age effects on all traits, with survival and breeding probability declining with age, while reproductive performance first improved with age before levelling off. We only found a very small, marginally significant, sex effect on survival probability, but evidence for decreasing age-specific breeding probability and reproductive performance with RA. As a result, males had slightly lower age-specific reproductive values than females, while birds of both sexes that recruited at the earliest ages of 2 and 3 years (i.e. 54% of the tern population) had somewhat higher fitness prospects than birds recruiting at later ages. While the RA effects on breeding probability and reproductive performance were statistically significant, these effects were not large enough to translate to significant effects on reproductive value. Age-specific reproductive values provided evidence for senescence, which came with fitness costs in a range of 17-21% for the sex-RA groups. Our study suggests that intraspecific variation in reproductive value may exist, but that, in the common tern, the differences are small.
对比个体间和个体内特征对长寿海鸟死亡风险的影响
影响因子：
4.8
作者：
Zhang H;Vedder O;Becker PH;Bouwhuis S
通讯作者：
Bouwhuis S