Population genomics and history of speciation reveal fishery management gaps in two related redfish species (Sebastes mentella and Sebastes fasciatus)

Understanding the processes shaping population structure and reproductive isolation of marine organisms can improve their management and conservation. Using genomic markers combined with estimation of individual ancestries, assignment tests, spatial ecology, and demographic modelling, we (i) characterized the contemporary population structure, (ii) assessed the influence of space, fishing depth and sampling years on contemporary distribution, and (iii) reconstructed the speciation history of two cryptic redfish species, Sebastes mentella and S. fasciatus. We genotyped 860 individuals in the Northwest Atlantic Ocean using 24,603 filtered single nucleotide polymorphisms (SNPs). Our results confirmed the clear genetic distinctiveness of the two species, and identified three ecotypes within S. mentella and five populations in S. fasciatus. Multivariate analyses highlighted the influence of spatial distribution and depth on the overall genomic variation while demographic modeling revealed th...

阐明塑造海洋生物种群结构与生殖隔离的演化过程，可为其资源管理与物种保护工作提供科学依据。本研究结合基因组分子标记、个体祖先成分估计、归属检验、空间生态学分析与种群动力学建模，开展三项研究内容：(i) 刻画目标类群的当代种群结构；(ii) 评估空间因子、捕捞深度与采样年份对物种当代分布格局的影响；(iii) 重建两种隐存红鱼物种——塞氏平鲉（Sebastes mentella）与条纹平鲉（S. fasciatus）的物种形成历史。研究团队于西北大西洋海域对860个个体进行基因分型，共使用24603个经过严格过滤的单核苷酸多态性（single nucleotide polymorphisms, SNPs）标记。研究结果证实了两个物种间清晰的遗传分化，并在塞氏平鲉（S. mentella）内鉴定出3个生态型，在条纹平鲉（S. fasciatus）内识别出5个种群。多变量分析表明，空间分布与水深对整体基因组变异具有显著影响，而种群动力学建模则揭示了……