远程基因流超出了从热带海洋基础物种海洋运输的预测
Ana I Tavares1, Jorge Assis2,3, Patrick D Larkin4
1Center of Marine Sciences (CCMAR-CIMAR), Universidade do Algarve, Faro, Portugal. ana.isa_@hotmail.com.
Scientific reports
|June 5, 2023
概括
海流并不能解释热带大西洋的海草Halodule wrightii的遗传差异. 草食动物的积极分散可能在连接种群中起着重要作用.
科学领域:
- 海洋生物学 海洋生物学
- 人口遗传学 人口遗传学
- 生物地理学 生物地理学 生物地理学
背景情况:
- 海洋生物在热带边缘的被动分散是不太了解的.
- 海洋运输假设缺乏大规模的经验验证.
- 海草Halodule wrightii遍布整个热带大西洋,提供了一个独特的模型.
研究的目的:
- 通过模拟海洋运输来测试H. wrightii的遗传分化是否可预测.
- 调查被动与活跃分散在塑造遗传结构中的作用.
- 将经验遗传数据与生物物理模型预测进行比较.
主要方法:
- 在热带大西洋的19个H. wrightii种群的基因定型,使用了8个微卫星位置.
- 开发一个模拟海洋流的高分辨率生物物理模型.
- 基因差异化模式与模拟的被动分散概率的比较.
主要成果:
- 观察到基因流量较低和基因差异较高,特别是在墨西哥湾和其他地区之间.
- 加勒比海-巴西和大西洋非洲的人口在遗传上比预期的更相似,因为它们的海洋分离.
- 生物物理模型显示被动分散的可能性很低,无法与经验遗传数据相匹配.
结论:
- 被动海洋运输不太可能是H. wrightii分散的主要驱动因素.
- 活跃的分散载体,如放牧动物,可能是连接种群的原因.
- 这项研究强调了在海洋生物地理学中考虑活跃分散的重要性.
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