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在高度分散的鱼中,与基因流动的局部适应
Juliana D Klein1, Simo N Maduna2, Matthew L Dicken3,4
1Molecular Breeding and Biodiversity Research Group, Department of Genetics Stellenbosch University Stellenbosch South Africa.
Evolutionary applications
|January 29, 2024
概括
基因组分析显示,在非洲南部的青铜鱼 (Carcharhinus brachyurus) 中存在适应差异. 尽管基因流量很高,但不同的遗传集群表明适应异质的海洋环境.
科学领域:
- 海洋生物学 海洋生物学
- 人口遗传学 人口遗传学
- 保护基因组学 保护基因组学
背景情况:
- 跨越异质环境的物种中预计会出现适应性分歧.
- 基因与环境的关联研究在elasmobranchs中是有限的.
- 青铜鱼 (Carcharhinus brachyurus) 在非洲南部广泛分布和被捕捞.
研究的目的:
- 为了评估C. brachyurus在异质的南非环境中的基因组多样性.
- 为了确定中性和适应性遗传变异.
- 了解与环境因素相关的人口结构和基因流动.
主要方法:
- 通过使用3RAD.生成全基因组单核酸多态 (SNP).
- 使用基于差异化的基因组扫描 (外侧) 和基因型环境分析 (冗余分析,潜伏因子混合模型).
- 进行了中性和假定适应性SNP的分析.
主要成果:
- 在中性SNP中发现了中度甚至基因组多样性,基因流量高,没有显著的人口结构.
- 总共确定了234个与生物气候变量相关的基于差异化的异常值和候选SNP.
- 假定适应性的SNP揭示了安哥拉和纳米比亚/南非之间的两个集群和深度分歧.
结论:
- 在C. brachyurus中发现了响应异质海洋景观的适应分歧的证据,尽管基因流量很高.
- 这项研究突出了大型移动鱼物种的适应潜力.
- 预计这些发现将为C. brachyurus种群的保护和管理策略提供信息.
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