独特的遗传模式塑造了钢头鱼的生命历史特征
Anne K Beulke1,2, Alicia Abadía-Cardoso3, Devon E Pearse2,4
1Department of Ocean Sciences, University of California, California, Santa Cruz, USA.
Molecular ecology
|November 9, 2023
概括
在钢头鱼 (Oncorhynchus mykiss) 中,像产卵日期和成熟年龄这样的生命史特征是高度遗传的,具有性别特异性的遗传影响. 这凸显了人类活动对这些危鱼群的影响.
科学领域:
- 进化生物学 进化生物学
- 保护遗传学 保护遗传学
- 渔业 科学 渔业 科学
背景情况:
- 生命历史的变化推动了适应,使其遗传和环境基础对保护至关重要.
- 形钢头鱼 (Oncorhynchus mykiss) 呈现出由遗传和环境因素影响的复杂生命史特征.
- 了解生殖特征的遗传性是管理危种群的关键.
研究的目的:
- 为了研究生命史特征的性别特异性模式及其在钢头鱼中的遗传性.
- 为了估计野生种群中产卵日期和成熟年龄的遗传性.
- 探索生命历史变异的遗传基础及其对保护的影响.
主要方法:
- 使用SNP数据重建了14年来13,474个父子三重组的大规模遗传血统.
- 估计的遗传性 (h2) 产卵日期和成熟时的年龄,使用血统信息.
- 分析了与迁移相关的反转多态的基因型,以寻找与生命史特征的性别特异相关性.
主要成果:
- 产卵日期表现出高遗传性 (h2 = 0.73),具有强烈的跨性别遗传相关性.
- 成熟时的年龄是高度遗传的 (h2 = 0.290.62) 与较低的跨性别遗传相关性.
- 在迁移逆转多态和成熟时的年龄之间观察到性别相关性.
结论:
- 钢头鱼主要生殖特征的显著遗传性表明了自然和性对抗性选择的作用.
- 生活史特征中的性别特异性遗传模式是显而易见的.
- 人为因素,包括息地修改和化场实践,显著影响钢头鱼的健康和进化,为保护战略提供信息.
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