当代的跨物种杂交和逆交在天堂鸟之间
Filip Thörn1,2,3, André E R Soares4, Ingo A Müller1,2,3
1Department of Bioinformatics and Genetics, Swedish Museum of Natural History, Stockholm, Sweden.
Evolution letters
|September 27, 2024
概括
天堂鸟,尽管有明显的特征,跨种类混合. 博物馆学揭示了大多数是第一代杂交物,证实了先前的评估,并显示了内进化的杂交,即使基因交换最小.
科学领域:
- 鸟类生物学 鸟类生物学
- 进化遗传学的进化遗传学
- 生物多样性研究的研究.
背景情况:
- 天堂鸟在形态,行为和交配系统方面表现出显著的多样性.
- 杂交事件,即使在不同的属之间,也在历史上记录在天堂鸟中.
- 由于明显的形态差异,许多杂交标本最初被误认为是不同的物种.
研究的目的:
- 使用博物馆学方法研究历史天堂鸟杂交标本的基因组组成.
- 评估这些标本中的亲属关系和杂交模式 (第一代与内向).
- 评估遗传杂交和观察到的形态特征之间的关系.
主要方法:
- 利用博物馆学框架分析历史天堂鸟杂交标本的基因组DNA.
- 在跨基因和内基因杂交标本上进行了基因组分析.
- 将基因组发现与现有的形态评估和分类进行比较.
主要成果:
- 证实,大多数研究的标本是第一代杂交.
- 在大多数情况下,识别的亲属物种与之前的形态评估一致.
- 发现了两种不同属之间的内进杂交的实例,以及两种混合形态缺乏明确的遗传杂交信号的情况.
结论:
- 提供了野生天堂鸟属之间发生的当代侵入性杂交的直接基因组证据.
- 表明,即使是轻微的内进也可能导致显著的形态变化.
- 突出了历史博物馆标本的实用性,以了解像杂交这样的进化过程.
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