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持续阻碍基因流动和灾难性事件对沿着智利海岸的红藻进化历史的影响

Oscar R Huanel^1,2,3, Alejandro E Montecinos⁴, Francisco Sepúlveda-Espinoza⁴

¹Núcleo Milenio MASH, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.

Frontiers in genetics

|March 25, 2024

概括

历史上的事事件塑造了智利的海洋生物. 33°S附近的稳定屏障影响了红色海藻的遗传结构,而随机过程推动了南部的分歧.

科学领域:

海洋生物学海洋生物学
人口遗传学人口遗传学
进化生物学进化生物学

背景情况:

历史上的替代事件和随机过程可以在物种中产生遗传断裂.
智利的30°S-33°S地区是海洋生物基因流动的潜在历史障碍.
以前的研究表明,这种屏障影响了各种海洋物种的遗传结构.

研究的目的:

为了研究四种共同分布的红色海藻物种的遗传结构,在智利海岸沿线具有较低的分散潜力.
为了确定历史上的替代事件或随机过程是否塑造了它们的遗传分歧.
在这些物种中识别特定的遗传断裂及其潜在原因.

主要方法:

在四种红色海藻中测序两个有机细胞基因 (COI和rbcL):Mazzaella laminarioides,M. membranacea,Asterfilopsis disciplinalis和Ahnfeltiopsis vermicularis.
分析智利海岸的遗传差异化和人口结构.
估计分歧时间以推断历史事件.

主要成果:

在研究的红色海藻物种中,发现了10个高度差异化的血统.
在33°S以北,观察到发生在290万到1240万年前的协和基因断裂,这表明历史上发生了代言事件.
在智利中南部海岸发现了可变的遗传断裂 (36°S,38°S,39°S,40°S),这表明局部的随机过程.

结论:

大约在米奥森中期发生的一次重大历史事件对智利南南33度以北的海洋生物的遗传结构产生了重大影响.
最近的随机事件和遗传漂移似乎是智利中南部沿海地区遗传分歧的主要驱动因素.
这些发现突出了历史障碍和当地过程在塑造智利海岸沿海生物多样性的独特作用.

关键词:

对基因流动的实际和历史障碍沿海提升是沿海的提升.比较的植物地理学.罗多菲塔 (Rhodophyta) 是一种植物.东南太平洋的东南太平洋

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