在人口丰富度高峰期间,在基因上不同的波罗的海鱼种群之间发生杂交的证据
Cecilia Helmerson1, Peggy Weist2, Marine Servane Ono Brieuc1,3
1Centre for Ecological and Evolutionary Synthesis Department of Biosciences University of Oslo Oslo Norway.
Evolutionary applications
|July 26, 2023
概括
波罗的海东部鱼的范围扩大导致了与波罗的海西部鱼的杂交. 尽管有可行的杂交物种,但不同的遗传库存仍然存在,显示出有限的长期影响.
科学领域:
- 海洋生物学 海洋生物学
- 人口遗传学 人口遗传学
- 进化生物学是进化的生物学.
背景情况:
- 范围的扩大可以增加不同种群之间的接触,可能导致杂交.
- 波罗的海 (Gadus morhua) 存在于基因上不同的东部和西部种群中,适应不同的环境.
- 环境条件和基因组分歧影响混合物生存能力.
研究的目的:
- 在20世纪80年代中期,研究波罗的海东部鱼产卵库存生物量增加的遗传影响.
- 确定范围扩大是否促进了不同波罗的海鱼种群之间的杂交.
- 评估杂交事件的生存能力和遗传后果.
主要方法:
- 对历史波罗的海鱼耳骨样本的分析.
- 基因型定制以评估种群组成和添加剂.
- 全基因组测序以验证杂交状态并分析基因组不相容性.
- 线粒体基因组分析以推断基因流动方向.
主要成果:
- 证据表明,波罗的海东部鱼在20世纪80年代扩展到西部地区.
- 在波罗的海东部和西部的鱼之间检测出高频率的可行的杂交 (F1,F2,逆交).
- 从东波罗的海的鱼雄性到西波罗的海的鱼雌性观察到的定向基因流动.
- 杂交并没有导致不同种群的长期遗传同质化.
结论:
- 增加的种群重叠可以促进高度分歧的鱼种群之间的杂交.
- 活力混合体可以在有利的环境条件下生存,即使在不同的种群之间.
- 尽管发生了杂交,但波罗的海鱼种群的独特遗传特征仍然存在.
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