Knowledge of migration behaviour and spatio-temporal habitat use is important for management and conservation, not least for diadromous species where population dynamics are affected by processes occurring in both freshwater and marine habitats. Sampling from a commercial capture fishery for the ecologically and economically important salmonid Salmo trutta L. we genotyped 189 single nucleotide polymorphisms and carried out genetic assignment of origin for 916 migratory sea trout sampled along ∼500 km of Britain’s North Sea coast. Population contributions to stocks showed strong geographical differences. Trout from rivers in the northern part of this coast (Tweed, Aln, Coquet, and Tyne) contributed the majority of migrants, irrespective of location, but fish from local rivers contributed to catches in most locations. Almost all (99%) trout assigned to native British populations and a large proportion (34%) of the sampled catches originated in rivers more than 100 km from capture sites, suggesting long-distance migration to be a common trait, confirming and enlarging historical trends from tagging data. Repeated sampling across years indicated short-term stability in migration patterns. Findings illustrate the scope for genetic stock identification to identify marine habitat use and monitor population-specific migration behaviours in species where stock assessment has not traditionally incorporated marine phase dynamics.

中文翻译：

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沿英国北海海岸的海鳟 (Salmo trutta L.) 的遗传种群鉴定显示出普遍的长距离迁徙

迁移行为和时空栖息地利用的知识对于管理和保护很重要，尤其是对于种群动态受淡水和海洋栖息地发生的过程影响的迁徙物种。从商业捕捞渔业中采样具有生态和经济重要性的鲑鱼Salmo truttaL. 我们对 189 个单核苷酸多态性进行了基因分型，并对沿英国北海海岸约 500 公里采样的 916 条洄游海鳟进行了遗传分配。种群对种群的贡献显示出强烈的地域差异。无论位置如何，来自该海岸北部河流（特威德、阿恩、科奎特和泰恩河）的鳟鱼贡献了大多数迁徙者，但在大多数地方，来自当地河流的鱼类贡献了捕获量。几乎所有 (99%) 的鳟鱼都属于英国本土种群，而且大部分 (34%) 的采样捕获物都来自距离捕获地点 100 公里以上的河流，这表明长距离迁移是一个共同特征，证实并扩大了历史标记数据的趋势。跨年重复抽样表明迁移模式的短期稳定性。