Sex-specific effects of inbreeding on reproductive senescence
Sex-specific effects of inbreeding on reproductive senescence
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DOI：
10.1098/rspb.2018.0231
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发表时间：
2018-05-30
影响因子：
4.7
通讯作者：
Muller, Wendt
中科院分区：
文献类型：
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作者：
de Boer, Raissa A.;Eens, Marcel;Muller, Wendt
近交衰退在进化生物学和生态学中起着重要的作用。然而，我们对近亲繁殖衰退的适应性后果缺乏深入的了解。研究往往集中在幼年后代的近亲繁殖的短期影响，而成年性状的近亲繁殖抑郁症和近亲繁殖抑郁症和年龄之间的相互作用很少得到解决。近交衰退可能会随着年龄的增长而增加，并加速衰老个体生殖输出的下降（生殖衰老），这可能会受到性别特异性动力学的影响。我们测试这一假设的纵向实验研究，在一个短命的鸣禽。成年近交和远交的雄性和雌性金丝雀配对的2 × 2析因设计，生存和每年的繁殖性能进行了研究3年。我们发现近亲繁殖抑制雌性产卵能力，男性受精成功和两性的生存。年度繁殖成功的男性和女性都下降时，与近亲繁殖的合作伙伴独立于自己的近亲繁殖状态。这表明，当远交个体与近交个体交配时，近亲繁殖会使远交个体产生适应性成本。此外，近亲繁殖的女性表现出更快的生殖衰老比远交的女性，证实近亲繁殖抑郁症和年龄可以相互作用，影响健身。相比之下，没有证据表明雄性受精成功的近亲繁殖衰退和生殖衰老之间存在相互作用。我们的研究结果强调了考虑性别特异性效应和年龄的重要性，以确定近亲繁殖的全方位健身后果，并表明近亲繁殖衰退可以加速生殖衰老。
Inbreeding depression plays a significant role in evolutionary biology and ecology. However, we lack a dear understanding of the fitness consequences of inbreeding depression. Studies often focus on short-term effects of inbreeding in juvenile offspring, whereas inbreeding depression in adult traits and the interplay between inbreeding depression and age are rarely addressed. Inbreeding depression may increase with age and accelerate the decline in reproductive output in ageing individuals (reproductive senescence), which could be subject to sex-specific dynamics. We test this hypothesis with a longitudinal experimental study in a short-lived songbird. Adult inbred and outbred male and female canaries were paired in a 2 x 2 factorial design, and survival and annual reproductive performance were studied for 3 years. We found inbreeding depression in female egg-laying ability, male fertilization success and survival of both sexes. Annual reproductive success of both males and females declined when paired with an inbred partner independent of their own inbreeding status. This shows that inbreeding can have fitness costs in outbred individuals when they mate with an inbred individual. Further, inbred females showed faster reproductive senescence than outbred females, confirming that inbreeding depression and age can interact to affect fitness. By contrast, there was no evidence for an interaction between inbreeding depression and reproductive senescence in male fertilization success. Our findings highlight the importance of considering sex-specific effects and age to determine the full range of fitness consequences of inbreeding and demonstrate that inbreeding depression can accelerate reproductive senescence.