Among highly migratory fish species, nursery areas occupied by juveniles often differ from adult habitats. To better understand the spatial dynamics of Canada's Northern cod stock, juveniles caught off the east coast of Newfoundland and Labrador were compared to adults from the same region as well as individuals from other areas in Atlantic Canada using ddRAD-derived single nucleotide polymorphisms (SNPs). A reduced proportion of homozygotes with a chromosomal inversion located in linkage group 1 (LG1) was detected between juvenile and adult samples in the Northern cod stock region, potentially indicating age-dependent habitat use or ontogenetic selection for attributes associated with the many genes located in LG1. No selectively neutral genetic differences were found between samples from the Northern cod stock; however, significant differences were found between some of these samples and cod collected from St. Pierre Bank, Bay of Fundy, Browns Bank and the southern Scotian Shelf. Clustering analysis of variants at neutral loci provided evidence for three major genetic units: 1) the Newfoundland Atlantic Coast, 2) eastern and southern Gulf of St. Lawrence and Burgeo Bank, and 3) the Bay of Fundy, Browns Bank and southern Scotian Shelf. Both adaptive and neutral population structure within the Northern cod stock should be considered by managers to promote demographic rebuilding of the stock. This article is protected by copyright. All rights reserved.

中文翻译：

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来自加拿大北部鳕鱼种群和邻近地区的大西洋鳕鱼的生命阶段依赖性超基因单倍型频率和中性种群中性遗传模式

在高度洄游的鱼类中，幼鱼占据的育苗区通常与成鱼栖息地不同。为了更好地了解加拿大北部鳕鱼种群的空间动态，使用 ddRAD 衍生的单核苷酸多态性 (SNP) 将在纽芬兰和拉布拉多东海岸捕获的幼鱼与来自同一地区的成鱼以及来自加拿大大西洋其他地区的个体进行比较. 在北部鳕鱼种群的幼年和成年样本之间检测到位于连锁组 1 (LG1) 中染色体倒位的纯合子比例降低，这可能表明与年龄相关的栖息地使用或个体遗传选择与位于LG1。在来自北方鳕鱼种群的样本之间没有发现选择性中性遗传差异；然而，发现其中一些样本与从圣皮埃尔银行、芬迪湾、布朗银行和南斯科舍大陆架收集的鳕鱼之间存在显着差异。中性位点变异的聚类分析为三个主要遗传单位提供了证据：1) 纽芬兰大西洋海岸，2) 圣劳伦斯湾和布尔乔湾东部和南部，以及 3) 芬迪湾、布朗斯湾和苏格兰大陆架南部. 管理者应考虑北方鳕鱼种群中的适应性和中性种群结构，以促进种群的人口重建。本文受版权保护。版权所有。中性位点变异的聚类分析为三个主要遗传单位提供了证据：1) 纽芬兰大西洋海岸，2) 圣劳伦斯湾和布尔乔湾东部和南部，以及 3) 芬迪湾、布朗斯湾和苏格兰大陆架南部. 管理者应考虑北方鳕鱼种群中的适应性和中性种群结构，以促进种群的人口重建。本文受版权保护。版权所有。中性位点变异的聚类分析为三个主要遗传单位提供了证据：1) 纽芬兰大西洋海岸，2) 圣劳伦斯湾和布尔乔湾东部和南部，以及 3) 芬迪湾、布朗斯湾和苏格兰大陆架南部. 管理者应考虑北方鳕鱼种群中的适应性和中性种群结构，以促进种群的人口重建。本文受版权保护。版权所有。