Reduced fitness in progeny from old parents in a natural population
Reduced fitness in progeny from old parents in a natural population
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自然种群中年老父母的后代适应性降低
DOI：
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发表时间：
2015
影响因子：
11.1
通讯作者：
T. Burke
中科院分区：
文献类型：
--
作者：
J. Schroeder;Shinichi Nakagawa;M. Rees;M. Mannarelli;T. Burke
随着父母年龄的增长，配子质量下降。如果这种下降影响到下一代，它可能会影响长寿的进化。在实验室里，年长的父母经常会产生适应性差的后代。我们从自然鸟类种群的长期数据显示，第一次我们的知识，与父母年龄相关的下一代的健康跨代减少。我们使用了10年的交叉培养实验，以排除环境的解释。我们的研究结果挑战了进化生物学和行为生态学中目前流行的假设，即老年标志着高质量的交配伴侣。我们的研究结果意味着与年长的伴侣而不是年轻的伴侣繁殖的成本很高。这些结果告诉人们，在医学、社会学和保护生物学中，延迟生殖越来越受到关注。一个非遗传的，跨世代的影响，父母的年龄对后代的健身已被描述在许多类群在实验室。这种代际适应度效应对种群动态、种群年龄结构、老龄化和寿命的演化都将产生重要影响。然而，父母年龄对后代终身健康的影响从未在自然群体中得到证实。我们表明，父母的年龄有性别特异性的终身健身的负面影响，使用的数据从一个纯种岛屿人口的野生家雀。父母年龄较大的鸟类每年产生的新兵比父母年龄较小的鸟类少，新兵数量的减少转化为终身健康差异。使用一个长期的交叉培养实验，我们证明，这种父母的年龄效应是不太可能的结果，在环境中的变化，但它可能是表观遗传。我们的研究揭示了晚年生殖的隐藏后果，这些后果会持续到下一代。
Significance As parents age, gamete quality declines. If this decline affects the next generation, it could influence the evolution of longevity. Older parents often produce offspring of low fitness in the laboratory. Our long-term data from a natural bird population shows, for the first time to our knowledge, a transgenerational reduction in fitness of the next generation associated with parental age. We use a 10-year cross-fostering experiment to exclude environmental explanations. Our results challenge the currently favored hypothesis in evolutionary biology and behavioral ecology that old age signals high quality in mating partners. Our results imply a substantial cost of reproducing with older, rather than younger, partners. The results inform increasing concern about delayed reproduction in medicine, sociology, and conservation biology. A nongenetic, transgenerational effect of parental age on offspring fitness has been described in many taxa in the laboratory. Such a transgenerational fitness effect will have important influences on population dynamics, population age structure, and the evolution of aging and lifespan. However, effects of parental age on offspring lifetime fitness have never been demonstrated in a natural population. We show that parental age has sex-specific negative effects on lifetime fitness, using data from a pedigreed insular population of wild house sparrows. Birds whose parents were older produced fewer recruits annually than birds with younger parents, and the reduced number of recruits translated into a lifetime fitness difference. Using a long-term cross-fostering experiment, we demonstrate that this parental age effect is unlikely to be the result of changes in the environment but that it potentially is epigenetically inherited. Our study reveals the hidden consequences of late-life reproduction that persist into the next generation.
影响因子：
4.9
作者：
Hsu, Yu-Hsun;Schroeder, Julia;Nakagawa, Shinichi
通讯作者：
Nakagawa, Shinichi