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首页> 外文期刊>ICES Journal of Marine Science >The influence of oceanographic processes on jack mackerel (Trachurus murphyi) larval distribution and population structure in the southeastern Pacific Ocean
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The influence of oceanographic processes on jack mackerel (Trachurus murphyi) larval distribution and population structure in the southeastern Pacific Ocean

机译：海洋学过程对东南太平洋杰克鲭鱼（Trachurus murphyi）幼虫分布和种群结构的影响

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摘要

The distribution of jack mackerel larvae in the main oceanic spawning area of the southeastern Pacific Ocean was investigated through three consecutive spring bio-oceanographic surveys (2003-2005). In this study, otolith microstructure analysis revealed a spatial age gradient with the smallest/youngest larvae specimens found primarily in the offshore area and the largest/oldest found in the coastal area, implying offshore-inshore larval drift. This suggests a connection between the oceanic spawning area and the historical coastal nursery ground (north of 30°S). In order to understand the oceanographic processes that drive this larval transport, we inferred circulation patterns from two data sources: mesoscale eddy trajectories identified by applying the Okubo-Weiss parameter to satellite geostrophic currents, and 20 years of satellite tracking data of drifters. Our results showed that eddy trajectories lead to net northwestward offshore transport (the opposite direction of larval connectivity). In addition, mean circulation associated with the subtropical anticyclonic gyre and recurrent energetic meandering structures seem to be the major mechanisms driving the spatial dynamics of the early jack mackerel life history, determining a net transport to nursery grounds. These mechanisms could play a key role in recruitment, which supports the continuity of the jack mackerel population.
机译：通过连续三个春季生物海洋学调查（2003-2005年）调查了东南太平洋主要海洋产卵区鲭鱼幼虫的分布。在这项研究中，耳石的微结构分析揭示了一个空间年龄梯度，其中幼虫标本最小/最主要出现在近海地区，而最大/最旧的幼虫则出现在沿海地区，这意味着近海-近海幼虫漂移。这表明海洋产卵区和历史沿海育苗场（北纬30°S）之间存在联系。为了了解驱动这种幼虫运输的海洋过程，我们从两个数据源推断出了循环模式：通过将Okubo-Weiss参数应用于卫星地转流确定的中尺度涡旋轨迹，以及20年的流浪者卫星跟踪数据。我们的研究结果表明，涡旋轨迹导致净向西北方向的近海运输（与幼体连通性相反的方向）。此外，与亚热带反气旋回旋和循环的高能曲折结构相关的平均循环似乎是推动早期鲭鱼生活史的空间动力学的主要机制，决定了向育苗场的净运输。这些机制可以在招募中发挥关键作用，从而支持鲭鱼种群的连续性。

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