Drift of propagules occurs within many populations inhabiting flow fields. This affects the number of propagules that rejoin their source population (recruitment) and plays a role in adaptive spatial redistribution. We focus on the cause and consequence of interannual variation in geographic distribution of population density among five cohorts of young‐of‐the‐year (age‐0) juvenile walleye pollock Gadus chalcogrammus in the western Gulf of Alaska (GOA). The coastal GOA is a wind‐driven advective system. Walleye pollock spawn during spring and their eggs and larvae drift southwestward; by late summer, age‐0 juveniles are variously distributed over the shelf. We found that high population densities of age‐0 juveniles (ca. 6 months old) near the southwestward exit of the Alaska Coastal Current from the GOA corresponded with high abundance of larvae from the major spawning area upstream, but did not translate into high abundance at older ages. Further, offshore and upwelling‐favorable winds were associated with the high downstream abundance and presumed export. In contrast, downwelling‐favorable (northeasterly) wind during and shortly after spawning (April–May) was associated with high recruitment at age 1. Finally, we found that recruitment also increased with apparent retention of age‐0 juveniles in favorable habitat upstream near the main spawning area. We hypothesize that wind‐related retention in superior upstream habitat favors recruitment. Our results argue for including wind‐driven transport in future walleye pollock recruitment models. We encourage more work on the juvenile stage of marine fishes aimed at understanding how transport and species‐specific habitat suitability interact to affect population response to large‐scale forcing.

中文翻译：

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东北太平洋幼体沿岸分布的年际变化：风的相关性和对募集的影响

繁殖体的漂移发生在居住在流场中的许多种群中。这影响了繁殖者重新加入其源种群（招募）的数量，并在适应性空间再分配中发挥了作用。我们关注五​​个年龄段（年龄为0岁）的幼年角膜孔雀狭鳕Gadus chalcogrammus的五个队列中的人口密度地理分布的年际变化的原因和结果在阿拉斯加西部海湾（GOA）。沿海GOA是风驱动的对流系统。角膜白斑鳕在春季产卵，其卵和幼虫向西南漂移。到夏末，0岁以下的少年在架子上的分布情况各不相同。我们发现，GOA的阿拉斯加沿海水流西南出口附近的0岁以下少年（大约6个月大）的高种群密度与上游主要产卵区的幼虫数量较高相对应，但并未转化为高种群数量年纪大了。此外，近海风和上升风向与下游高丰度和推测出口有关。相比之下，产卵期间和产卵后不久（4月至5月）的下行有利风（东北风）与1岁时的高招募有关。最后，我们发现，随着0岁幼体明显滞留在主要产卵区上游的有利生境中，招募也有所增加。我们假设与风有关的滞留在上游上游栖息地有利于募集。我们的结果表明，将风能运输纳入未来的角膜白鳕招募模型中。我们鼓励在海洋鱼类的幼年阶段进行更多的工作，旨在了解运输和特定物种栖息地的适应性如何相互作用以影响种群对大规模强迫的反应。