Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes

Movement diversity within species represent an important, but often neglected, component of biodiversity that affects ecological and genetic interactions, as well as the productivity of exploited systems. By combining individual tracking data from acoustic telemetry with novel genetic analyses, we describe the movement diversity of two Atlantic cod Gadus morhua ecotypes in two high-latitude fjord systems: the highly migratory Northeast Arctic cod (NEA cod) that supports the largest cod fishery in the world, and the more sedentary Norwegian coastal cod, which is currently in a depleted state. As predicted, coastal cod displayed a higher level of fjord residency than NEA cod. Of the cod tagged during the spawning season, NEA cod left the fjords permanently to a greater extent and earlier compared to coastal cod, which to a greater extent remained resident and left the fjords temporarily. Despite this overall pattern, horizontal movements atypical for the ecotypes were common with some NEA..., ,

物种内的运动多样性是生物多样性中一项重要却常被忽视的组成部分，其可对生态与遗传互作，以及受开发利用的生态系统生产力产生影响。本研究通过整合声学遥测（acoustic telemetry）获取的个体追踪数据与新型遗传分析手段，对两处高纬度峡湾系统内的两种大西洋鳕（Gadus morhua）生态型的运动多样性进行了描述：其一为支撑全球规模最大鳕鱼渔业的高度洄游东北大西洋鳕鱼（NEA cod），其二为当前资源处于枯竭状态、定居性更强的挪威近海鳕鱼。正如预期那般，挪威近海鳕鱼的峡湾居留率高于NEA cod。在产卵季完成标记的鳕鱼中，NEA cod相较近海鳕鱼更早且更大概率永久离开峡湾；而近海鳕鱼则更多选择居留，仅临时离开峡湾。尽管存在这一整体模式，但不符合该生态型典型特征的水平移动仍较为常见，部分NEA……