什么不杀死你会让你更强壮吗? 父亲在受孕时的年龄对父亲和儿子的影响
Krish Sanghvi1, Tommaso Pizzari1, Irem Sepil1
1Department of Biology, University of Oxford, Oxford, United Kingdom.
Evolution; international journal of organic evolution
|June 24, 2024
概括
果中父亲年龄的提升并没有损害后代的质量. 年长的父亲生下了长寿的儿子,这表明生存能力选择,而不是生殖衰老,有利于后代.
科学领域:
- 进化生物学是进化的生物学.
- 老年学是指老年学的学科.
- 生殖生物学 生殖生物学
背景情况:
- 男性年龄的增长通常与由于生殖衰老而导致生育能力和后代质量降低有关.
- 然而,年长的父亲可以通过终端投资或通过传递有益的等位基因 (活力选择) 来缓冲这些影响.
- 区分这些机制需要对父亲的年龄,存活率,生殖表现和后代质量进行综合研究.
研究的目的:
- 为了研究父亲在受孕时的年龄 (PAC) 对Drosophila melanogaster的父亲生存,生殖成功和后代寿命的影响.
- 区分终端投资,可行性选择和选择性消失作为影响父亲年龄影响的机制.
- 为了确定男性的生殖衰老是否对后代质量有有害影响.
主要方法:
- 在Drosophila melanogaster.中采用了一个横截面研究设计.
- 在受孕时的父亲年龄 (PAC) 与父亲的存活率和生殖成功相比进行了分析.
- 测量后代 (儿子) 的寿命,以评估父亲年龄的影响.
主要成果:
- 晚年交配与未来男性存活率下降相关,可能是由于脆弱性.
- 没有发现终端投资的证据;生殖衰老直到成年后期才开始.
- 父亲寿命的延长与仅在较老的PAC群体中产生的后代的增加有关.
- 年长父亲的儿子的寿命更长,这表明生存能力选择的作用.
结论:
- 父亲年龄的提升并不总是不利于后代的质量,甚至可以带来好处.
- 活力选择,即年长的父亲传承高活力等位基因,似乎是一个关键的机制.
- 男性的生殖衰老可能不会像以前假设的那样显著地影响后代的质量.
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