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基因组分析显示,肯尼亚的三种长鹿物种之间存在有限的杂交
Raphael T F Coimbra1,2, Sven Winter3,4, Arthur Muneza5
1Senckenberg Biodiversity and Climate Research Centre, Frankfurt, Germany. raphael.t.f.coimbra@gmail.com.
BMC biology
|October 14, 2023
概括
长鹿 (Giraffa spp.) 的意思是长鹿. 肯尼亚的基因系显示历史基因流动,但保持基因组完整性,表明有效的生殖隔离. 尽管过去的杂交,但在这些野生种群中仍然存在明显的物种界限.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 保护遗传学 保护遗传学
背景情况:
- 生殖隔离在物种化连续上有所变化,由于基因流动,物种界限模糊.
- 长鹿 (Giraffa spp.) 的意思是长鹿. 众所周知,在囚禁中进行杂交,有关于自然杂交的事报道.
- 努比亚长鹿 (G. camelopardalis camelopardalis),网状长鹿 (G. reticulata) 和马赛长鹿 (G. tippelskirchi tippelskirchi) 在肯尼亚是双亲长鹿,这表明有可能发生杂交.
研究的目的:
- 调查肯尼亚努比亚,网状鹿和马赛长鹿系的历史和当代基因流动.
- 评估这些东非长鹿的基因组完整性和生殖隔离.
- 了解长鹿血统的种群动态和有效种群大小.
主要方法:
- 分析了来自野生长鹿的128个全基因组序列,其中包括113个新测序的个体.
- 基因组分析以检测长鹿血统中的祖先模式和混合水平.
- 自晚普莱斯托纪以来有效种群大小的估计.
主要成果:
- 在网状长鹿中检测到不同程度的努比亚祖先,表明历史基因流动.
- 网状长鹿和马赛长鹿之间的最小混合水平,具有较弱的历史基因流动和潜在的线粒体内侵入的迹象.
- 在东非长鹿系之间没有检测到统计学上显著的当代基因流动.
- 自普纪晚期以来,有效种群大小的显著下降,特别是努比亚和网状长鹿.
结论:
- 尽管有历史性的杂交,但这三个长鹿的血统保持了整体的基因组完整性.
- 支持有效的生殖隔离,与以前将长鹿分为不同的物种的分类相一致.
- 基因组数据证实了东非长鹿种群中物种界限的持久性.
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