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自然巨大的干扰导致鱼Aphos porosusus多样性和遗传结构的空间和时间变化

Cynthia Vásquez^1,2, Iván Vera-Escalona³, Antonio Brante^3,4,5

¹Interdisciplinary Center for Aquaculture Research (INCAR), Universidad de Concepción, Concepción, Chile.

Scientific reports

|August 25, 2023

概括

两个主要的自然干扰大大减少了Aphos porosus物种的遗传多样性和种群规模. 这表明灭绝-重新殖民动态的增加和基因结构的改变,突出显示了持续监测的必要性.

科学领域:

海洋生物学海洋生物学
人口遗传学人口遗传学
生态生态学生态生态学

背景情况:

自然干扰对海洋种群的遗传多样性和结构产生深远的影响.
智利海岸在2008年经历了一次严重的低氧上升事件,并在2010年经历了一次大地震和海.
脆弱的Aphos porosus物种,分布有限,受到这些事件的重大影响.

研究的目的:

评估2008年低氧上升和2010年地震海对Aphos porosus遗传多样性和时空结构的影响.
为了比较两个不同干扰水平的区域的影响:科利乌莫湾 (高) 和伊塔塔架 (低).

主要方法:

利用13个微卫星标记器来分析遗传变异.
从2008年到2015年收集和分析了Aphos porosus个体.
在高和低影响区之间比较遗传多样性和时空结构.

主要成果:

干扰后的种群显示遗传多样性减少和有效种群大小 (Ne < 20).
观察到迁移模式和时空遗传结构中的不对称性.
遗传多样性的显著丧失,特别是在受严重影响的科利乌莫湾地区.

结论:

干扰可能引发了Aphos porosus种群的本地灭绝-重新殖民动态.
基因漂移和基因流动有助于增加时空遗传结构.
持续的遗传监测对于评估未来干扰对Aphos porosus造成的风险至关重要.

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