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Drift probabilities for Icelandic cod larvae

机译：冰岛鳕鱼幼虫的漂移概率

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The climatological distribution of juvenile Icelandic cod is characterized by a negative spatial age gradient, with a fairly abrupt decrease in age near the northwest corner of Iceland, and a spatial abundance gradient with higher concentrations of 0-group fish inshore. Flowfields from a high-resolution circulation model developed for Icelandic waters were used to investigate larval drift from the various spawning grounds in Icelandic coastal waters to understand the distribution of 0-group fish. To present the results clearly, drift probability density functions (pdfs) are derived describing the probability of drifting from a given spawning ground to a given spatial region over a specified time interval. These pdfs are used to determine the spawning grounds most probably contributing to the observed age distribution. The observed spatial gradient in age is likely due to differences in the spawning location of larvae, with older larvae originating in spawning grounds in the southwest and younger larvae from farther north. In general, the contribution from the main spawning grounds in the southwest is predicted to decrease with clockwise distance from the source region. The pdf technique was also used to investigate drift from regions on the south coast of Iceland corresponding to known or possible subpopulation spawning grounds, to see whether these spawning areas are associated with distinct drift patterns. This technique is a useful way to present larval drift results and to facilitate comparison with real data.
机译：冰岛鳕鱼幼鱼的气候分布特征是年龄年龄梯度为负，在冰岛西北角附近的年龄急剧下降，而近岸零类鱼类浓度较高时则为空间丰度梯度。使用针对冰岛水域开发的高分辨率环流模型的流场来研究来自冰岛沿海水域各种产卵场的幼体漂移，以了解零类鱼类的分布。为了清楚地显示结果，导出了漂移概率密度函数（pdfs），描述了在指定的时间间隔内从给定的产卵场漂移到给定的空间区域的概率。这些pdf用于确定产卵场，最有可能有助于观察到的年龄分布。观察到的年龄空间梯度可能是由于幼虫的产卵位置不同，其中较大的幼虫起源于西南的产卵场，而较幼的幼虫则来自较北的幼虫。通常，西南主要产卵场的贡献预计会随着与源区域的顺时针距离而减小。 pdf技术还用于调查来自冰岛南海岸与已知或可能的亚种群产卵场相对应的区域的漂流，以查看这些产卵区是否与明显的漂流模式相关。该技术是呈现幼虫漂移结果并促进与实际数据进行比较的有用方法。

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