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首页> 外文期刊>ICES Journal of Marine Science >Otolith shape and temporal stability of spawning groups of Icelandic cod (Gadus morhua L.)
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Otolith shape and temporal stability of spawning groups of Icelandic cod (Gadus morhua L.)

机译：冰岛鳕（Gadus morhua L.）产卵群的耳石形状和时间稳定性

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During the past 5-10 years, studies exploring small-scale structure of cod populations have provided accumulating evidence for the existence of local populations. In Iceland, all cod have been thought to belong to a single management unit. Recent studies on genetic and life history variation have, however, indicated the existence of local populations. The main objective of this study is to explore the potential existence of local populations by use of otolith shape to discriminate between spawning groups of Icelandic cod. Otoliths were sampled from mature and spawning cod at spawning locations around Iceland in 2002 and 2003, and otolith shape was described using variables correlated with size (otolith area, length, width, perimeter, and weight) as well as shape (rectangularity, circularity, and 10 Fourier coefficients). Only standardized otolith variables were used so as to remove the effect of otolith size on the shape variables. Cod were on average larger and older south of Iceland, where ambient temperature was higher than northwest, north, and east of Iceland. Otolith shape effectively discriminated between cod north and south of Iceland, and it was also possible to discriminate among cod spawning below and above 125 m at spawning locations south of Iceland. Recent genetic and tagging studies have indicated differences between cod at these two depths. Correct classification of groups of cod at the different spawning locations ranged between 0% and 44%. Incorrectly classified cod were in most cases classified to adjacent spawning locations, and a high percentage of cod south of Iceland was classified to other southern locations and cod north of Iceland to other northern locations. The temporal stability of otolith shape was studied at seven spawning locations in two consecutive years. Otolith shape differences were greater between locations than among years within a location. The spawning groups are therefore likely to have remained separate during much of their lifetime.
机译：在过去的5-10年中，探索鳕鱼种群小规模结构的研究为当地种群的存在提供了越来越多的证据。在冰岛，所有鳕鱼都被认为属于一个管理单位。然而，有关遗传和生活史变异的最新研究表明存在当地人口。这项研究的主要目的是通过使用耳石形状来区分冰岛鳕鱼的产卵群体来探索当地种群的潜在存在。从2002年和2003年在冰岛产卵地点的成熟鳕鱼和产卵鳕鱼中提取耳石，并使用与大小（耳石面积，长度，宽度，周长和重量）以及形状（矩形，圆度，和10个傅立叶系数）。仅使用标准化的耳石变量，以消除耳石大小对形状变量的影响。鳕鱼平均年龄更大，年龄更大，位于冰岛南部，那里的环境温度高于冰岛的西北，北部和东部。耳石的形状可以有效地区分冰岛北部和南部的鳕鱼，而且还可以区分在冰岛南部产卵点以下125 m和上方产生的鳕鱼。最近的遗传和标签研究表明，这两个深度的鳕鱼之间存在差异。鳕鱼在不同产卵位置的正确分类范围为0％至44％。在大多数情况下，未正确分类的鳕鱼被分类到相邻的产卵地点，冰岛南部的鳕鱼中有很高的百分比被分类到其他南部地点，冰岛北部的鳕鱼被分类到其他北部地点。连续两年在七个产卵位置研究了耳石形状的时间稳定性。地点之间的耳石形状差异比地点内的年间差异大。因此，产卵组可能在其一生的大部分时间都保持分离状态。

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