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首页> 外文期刊>ICES Journal of Marine Science >Linking tagging technology and molecular genetics to gain insight in the spatial dynamics of two stocks of cod in Northeast Atlantic waters
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Linking tagging technology and molecular genetics to gain insight in the spatial dynamics of two stocks of cod in Northeast Atlantic waters

机译：将标签技术和分子遗传学联系起来，可以洞悉东北大西洋水域中两种鳕鱼种群的空间动态

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The Northeast Arctic cod (Gadus morhua L.: NEAC) remains the most abundant cod stock in the North Atlantic, while the catches of the partially co-occurring Norwegian coastal cod (NCC) stocks have dramatically decreased in recent years. To ensure effective management of the two stocks, it is necessary to know if the population genetic structure is associated with any pattern in the spatial dynamics or whether it is affected by any distinct environmental factors. By combining information from electronicdata storage tags (DST) and molecular genetics methods with statistical tools, we have been able to associate spatial dynamics and distinct environmental factors to the two cod stocks. In general, adult NEAC migrate between deep, warm overwintering grounds and shallow summer feeding grounds where water temperatures maybe low. In contrast, NCC do not undertake large-scale seasonal migrations, show little seasonal variation in depth distribution, and experience the opposite seasonal change in temperature compared with NEAC However, within the NCC group, some individuals did conduct longer horizontal movements than others. Even though the distances calculated in this study represent the shortest distance between release and recapture positions, they are far higher than previously reported by NCC. Distinctive depth profiles indicate that this migrant NCC have moved out of the area, passing the deep trenches outside Lofoten while more stationary NCC occupies shallower depths throughout the year. The temperature profiles also indicate that migrant and stationary NCC has occupied different areas during the year. We demonstrate that the combination of information from DSTs and molecular genetics offers a deeper understanding of individual cod behaviour, provides an insight in the spatial dynamics of the species, and ultimately, improves the scientific basis for management of a complex mixed fishery of Atlantic cod.
机译：东北北极鳕鱼（Gadus morhua L.：NEAC）仍然是北大西洋中最丰富的鳕鱼种群，而部分同时出现的挪威沿海鳕鱼（NCC）种群的捕获量近年来却急剧下降。为了确保有效管理这两种种群，有必要知道种群遗传结构是否与空间动态中的任何模式相关联，或者是否受到任何独特的环境因素的影响。通过将来自电子数据存储标签（DST）和分子遗传学方法的信息与统计工具结合起来，我们已经能够将空间动态和独特的环境因素与这两种鳕鱼种群相关联。通常，成年NEAC在水温可能较低的较深的温暖越冬地和夏季浅食地之间迁移。相比之下，NCC不会进行大规模的季节性迁徙，深度分布几乎没有季节性变化，并且与NEAC相比经历相反的温度变化。但是，在NCC组中，有些人的水平运动比其他人更长。即使在此研究中计算出的距离代表释放和重新捕获位置之间的最短距离，但它们仍远高于NCC先前报告的距离。明显的深度剖面表明，这个迁徙的NCC已经移出该区域，经过了Lofoten外的深沟，而全年固定的NCC占据了较浅的深度。温度曲线还表明，一年中移徙和固定的NCC占据了不同区域。我们证明，来自DST和分子遗传学的信息的结合提供了对鳕鱼个体行为的更深入了解，提供了该物种空间动态的见识，并最终改善了大西洋鳕鱼复杂混合渔业管理的科学基础。

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