在Agrodiaetus蝶中加强了前阴位隔离和型进化
Vladimir A Lukhtanov1, Nikolai P Kandul, Joshua B Plotkin
1Department of Entomology, St Petersburg State University, Universitetskaya nab. 7/9, St Petersburg 199034, Russia.
Nature
|July 22, 2005
概括
强化进化驱动物种化,有利于繁殖隔离. 对Agrodiaetus蝶的研究表明,与染色体变异相关的翅膀颜色差异,支持强化作为关键的物种驱动因素.
科学领域:
- 进化生物学 进化生物学
- 规范研究研究 规范研究
- 遗传学和染色体进化研究
背景情况:
- 强化模型假设自然选择通过惩罚不适合的杂交物来加强生殖隔离.
- 强化在物种化中的作用的经验证据仍然有限,尽管有理论支持.
- 具有多样化的染色体数量和独特的雄性翅膀颜色的Agrodiaetus蝶为研究强化提供了一个独特的模型.
研究的目的:
- 调查加强在Agrodiaetus蝶的物种化中的作用.
- 为了确定是否对称的分布模式与驱动生殖隔离的特征相关.
- 为了区分强化与其他物种化模型,如对称物种化.
主要方法:
- 使用了比较的遗传学分析.
- 研究了Agrodiaetus的15个年轻姐妹种群的分布模式.
- 与雄性翅膀颜色变化和型差异相关的交对分布.
主要成果:
- 在Agrodiaetus姐妹种群的交配分布和雄性翅膀颜色的差异之间发现了强烈的相关性.
- 观察到的模式强烈表明,强化驱动了这个群体的物种化.
- 在全病变中积累的型变化似乎会在二次接触时触发强化.
结论:
- 强化,由对不适合杂交的选择驱动,是促进Agrodiaetus物种化的重要机制.
- 同型物种化不太可能解释Agrodiaetus中观察到的模式.
- 艾洛帕特里克型分歧和随后的二次接触的相互作用促进了强化驱动的物种化.
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