母亲年龄对后代寿命和生殖的影响在物种内部有所不同
Alyssa Liguori1,2, Sovannarith Korm1, Alex Profetto1,3
1Josephine Bay Paul Center for Comparative Molecular Biology and Evolution, Marine Biological Laboratory Woods Hole Massachusetts USA.
Ecology and evolution
|May 17, 2024
概括
母亲的年龄会影响后代的寿命和健康状况,但这种影响在不同基因菌株的Brachionus plicatilis rotifer中存在显著差异. 这种变异性对于理解衰老和生命史演变至关重要.
科学领域:
- 进化生物学 进化生物学
- 老年学是一门学科.
- 生殖生物学 生殖生物学
背景情况:
- 来自老年母亲的后代在物种之间经常表现出寿命和健康状况的减少.
- 对于孕产妇年龄影响的物种内变异的了解很少,除了少数关节动物物种之外,数据有限.
研究的目的:
- 为了研究母亲年龄对后代生命史特征的影响在Brachionus plicatilis物种复合体内的变异性.
- 为了比较不同暴露于母亲年龄变化的遗传菌株的寿命,生殖时间表和终身生殖产量.
主要方法:
- 利用了四种不同的Brachyonus plicatilis rotifer遗传菌株.
- 在每个菌株内比较来自年轻,中年和老年母亲的后代.
- 分析后代的寿命,生殖时间表和终身生殖产量.
主要成果:
- 在母亲年龄影响的幅度和方向上观察到显著的菌株特异性变异.
- 在一个菌株中,年轻母亲的后代比老母亲的子女寿命长20%;其他菌株没有显著的寿命差异.
- 孕产妇年龄对一生的生殖产量有不同的影响 (积极,消极或没有) 取决于菌株.
- 在所有菌株中,年长的母亲始终会产生具有更高早期最大每日繁殖率的后代.
结论:
- 母亲年龄对后代生命率的影响在物种内部是高度可变的,不仅仅是由寿命-繁殖权衡来解释的.
- 这项研究强调了物种内变化的重要性,以了解母亲年龄影响的无处不在性和进化作用.
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