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Fanny Touchard¹, Frédérique Cerqueira¹, Nicolas Bierne¹

¹ISEM, University of Montpellier, CNRS, EPHE, IRD, Montpellier, France.

Evolution letters

|August 5, 2024

概括

人类运输引入入侵袭性物种,如北太平洋海 (Ciona robusta) 进入新的环境,导致与本地物种 (Ciona intestinalis) 进行适应性侵入. 这项研究追踪了随着时间的推移发生的遗传变化,揭示了稳定的适应性等位基因,但在侧边区域减少了祖先.

科学领域:

海洋生物学海洋生物学
进化遗传学的进化遗传学
侵入性物种研究研究侵入性物种研究

背景情况:

人类活动促进了物种穿越海洋的运输,打破了自然分散障碍.
北太平洋海 (Ciona robusta) 引入北大西洋海 (Ciona intestinalis) 的本地范围导致了杂交.
以前的研究表明,从C. robusta到C. intestinalis的特定染色体区域的自适应性内移.

研究的目的:

为了监测Ciona robusta和Ciona intestinalis之间适应性内侵的时间动态.
分析内进化的核心和邻近区域的车效应中的等位基频率.
评估内入侵对人类改变环境中的本地和入侵物种相互作用的影响.

主要方法:

1000个Ciona spp.的基因型鉴定来自接触区内的22个港口的个人.
使用KASP多重基因造型方法来识别本地,非本地和杂交个体,以及内向的单元类型.
在20个世代的14个港口采样,以追踪随时间推移的遗传变化.

主要成果:

没有发现早期一代杂交物种;现场观测表明,引入的C. robusta种群的数量有所下降.
适应性C. robusta等位基因的稳定频率在空间和时间的核心入侵区域被观察到.
观察到C. robusta祖先区域在与核心区域相邻的染色体肩膀中受到侵蚀,这表明选择的二级阶段.

结论:

适应性侵入正在发生,稳定的适应性等位基因在核心区域持续存在.
选择正在清除与适应性等位基因搭乘的不兼容突变,导致侧边区域的祖先减少.
观察到的适应性侵入可能会改变人类影响的海洋生态系统中本地和入侵性Ciona物种之间的竞争动态.

关键词:

适应性内向攻击 (adaptive introgression) 是一种适应性的内向攻击.人为杂交化的人为杂交化.生物入侵生物入侵地方适应地方适应马里纳斯海是一个海.选择性的扫除选择性的扫除

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