Long-lived marine species may be resilient to environmental variability through a temporal portfolio effect

Maintenance of a portfolio of adaptive alleles may provide resilience of populations to natural environmental variability. We used Pacific ocean perch (POP; Sebastes alutus) to test for the maintenance of adaptive variation across overlapping generations. POP are a long-lived species characterized by widespread larval dispersal in their first year and a longevity of over 100 years. In order to understand how early marine dispersal affects POP survival and population structure, we used Restriction Site Associated DNA sequencing (RADseq) to obtain 11,146 single-nucleotide polymorphisms (SNPs) from 401 young-of-the-year (YOY) POP collected during surveys conducted in 2014 (19 stations) and 2015 (4 stations) in the eastern Gulf of Alaska. Population clustering analysis showed that the POP samples represented four distinct ancestral populations mixed throughout the sampling area. Based on prior work on larval dispersal of POP, these larvae are most likely from distinct parturition locations ...维持适应性等位基因库或许可赋予种群抵御自然环境波动的抗逆能力。本研究以太平洋岩鱼（Pacific ocean perch, POP; *Sebastes alutus*）为研究对象，检验重叠世代间适应性变异的维持机制。太平洋岩鱼为长寿命物种，其幼体在出生第一年具备广泛扩散能力，寿命可达百年以上。为阐明早期海洋扩散如何影响太平洋岩鱼的存活与种群结构，我们采用限制性酶切位点相关DNA测序（Restriction Site Associated DNA sequencing, RADseq）技术，对2014年（19个采样站位）与2015年（4个采样站位）在阿拉斯加湾东部海域采集的401尾当年生幼鱼（young-of-the-year, YOY）进行测序，共获得11146个单核苷酸多态性（single-nucleotide polymorphisms, SNPs）位点。种群聚类分析结果显示，本次采集的岩鱼样本代表了4个遗传分化显著的祖先种群，且这些种群在整个采样区域内混合分布。结合此前针对太平洋岩鱼幼体扩散的研究成果，本次采集的幼体极有可能源自不同的产仔位点……