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来自初始生态型分歧的染色体逆转驱动了加拉帕戈斯甲虫的逐渐重复辐射

Carl Vangestel^1,2, Janne Swaegers^1,3, Zoë De Corte^1,2

¹Royal Belgian Institute of Natural Sciences, Brussels, Belgium.

Science advances

|May 31, 2024

概括

加拉帕戈斯群岛高地甲虫的重复进化是由岛屿之间的古老分歧和基因流动驱动的. 这项研究揭示了最初的适应如何塑造岛屿生态系统随后的并行进化.

科学领域:

进化生物学进化生物学
岛屿生物地理岛屿生物地理
遗传学是一个遗传学.

背景情况:

岛屿生态系统经常显示类似特征的重复演变.
这些决定性进化轨迹的驱动因素,特别是初始分歧和岛际基因流动的作用,尚未完全理解.

研究的目的:

研究高地生态型从加拉帕戈斯 *Calosoma* 甲虫的低地祖先反复适应背后的进化机制.
为了确定最初的分歧事件和随后的岛屿之间的遗传交换是否推动了并行进化.

主要方法:

研究了高地生态型从低地生态型在加拉帕戈斯群岛链*Calosoma*甲虫的逐渐演变.
分析遗传数据,重点关注染色体逆转和与高地适应相关的共享等位基因.

主要成果:

重复的高地适应涉及在大染色体逆转中共享的等位基因的选择. 这些逆转源于最古老的岛屿的初始适应事件.
高地逆转最初是通过高地个体的分散传播的.
随后与低地种群的混合产生了多态种群,从中高地种群在较年轻的岛屿上演变.

结论:

一个古老的分歧事件显著影响了岛屿上的重复进化轨迹.
岛际殖民化和岛内进化的结合形成了平行物种社区.

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