Despite the devastating impact of the lionfish (Pterois volitans) invasion on NW Atlantic ecosystems, little genetic information about the invasion process is available. We applied Genotyping by Sequencing techniques to identify 1,220 single nucleotide polymorphic sites (SNPs) from 162 lionfish samples collected between 2013 and 2015 from two areas chronologically identified as the first and last invaded areas in US waters: the east coast of Florida and the Gulf of Mexico. We used population genomic analyses, including phylogenetic reconstruction, Bayesian clustering, genetic distances, Discriminant Analyses of Principal Components, and coalescence simulations for detection of outlier SNPs, to understand genetic trends relevant to the lionfish's long-term persistence. We found no significant differences in genetic structure or diversity between the two areas (F_ST p-values > 0.01, and t-test p-values > 0.05). In fact, our genomic analyses showed genetic homogeneity, with enough gene flow between the east coast of Florida and Gulf of Mexico to erase previous signals of genetic divergence detected between these areas, secondary spreading, and bottlenecks in the Gulf of Mexico. These findings suggest rapid genetic changes over space and time during the invasion, resulting in one panmictic population with no signs of divergence between areas due to local adaptation.

中文翻译：

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基于单核苷酸多态性，横跨西北大西洋和墨西哥湾的入侵l鱼的遗传同质性。

尽管the鱼（Pterois volitans）入侵对西北大西洋生态系统造成了毁灭性影响，但几乎没有关于入侵过程的遗传信息。我们应用测序技术进行基因分型，从2013年至2015年期间从两个按时间顺序被确定为美国水域第一个和最后一个入侵区域的地区（佛罗里达州的东海岸和墨西哥湾）从162个l鱼样品中鉴定了1,220个单核苷酸多态性位点（SNP）墨西哥。我们使用种群基因组分析，包括系统发育重建，贝叶斯聚类，遗传距离，主成分判别分析和合并模拟来检测异常SNP，以了解与the鱼长期持久性有关的遗传趋势。_ST p值> 0.01，t检验p值> 0.05）。实际上，我们的基因组分析显示出遗传同质性，佛罗里达州东海岸和墨西哥湾之间有足够的基因流，可以消除以前在这些区域之间检测到的遗传差异，二次扩散和墨西哥湾瓶颈的信号。这些发现表明，在入侵过程中，随着时间和空间的变化，遗传迅速改变，导致一个恐慌种群，没有因局部适应而在各区域之间出现分歧的迹象。