This paper investigates environmental drivers of U.S. West Coast petrale sole (Eopsetta jordani) recruitment as an initial step toward developing an environmental recruitment index that can inform the stock assessment in the absence of survey observations of age‐0 and age‐1 fish. First, a conceptual life history approach is used to generate life‐stage‐specific and spatio‐temporally specific mechanistic hypotheses regarding oceanographic variables that likely influence survival at each life stage. Seven life history stages are considered, from female spawner condition through benthic recruitment as observed in the Northwest Fisheries Science Center West Coast Groundfish Bottom Trawl Survey (age‐2 fish). The study area encompasses the region from 40 to 48°N in the California Current Ecosystem. Hypotheses are tested using output from a regional ocean reanalysis model outputs and model selection techniques. Four oceanographic variables explained 73% of the variation in recruitment not accounted for by estimates based exclusively on the spawning stock size. Recruitment deviations were (a) positively correlated with degree days during the female precondition period, (b) positively correlated with mixed‐layer depth during the egg stage, (c) negatively correlated with cross‐shelf transport during the larval stage, and (d) negatively correlated with cross‐shelf transport during the benthic juvenile stage. While multiple mechanisms likely affect petrale sole recruitment at different points during their life history, the strength of the relationship is promising for stock assessment and integrated ecosystem assessment applications.

中文翻译：

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加利福尼亚州当前生态系统中海藻唯一招募的海洋学驱动因素

本文调查了美国西海岸海藻底（Eopsetta jordani）的环境驱动因素）招募是建立环境招募指数的第一步，可以在没有0岁和1岁鱼的调查观察的情况下为种群评估提供信息。首先，使用一种概念性的生命历史方法来生成关于海洋变量的生命阶段特定和时空特定的机制假设，这些假设可能影响每个生命阶段的生存。在西北渔业科学中心西海岸底鱼底拖网调查（2岁鱼）中观察到，从雌性产卵者的状况到底栖募集的七个生命史阶段被考虑。研究区域涵盖了加利福尼亚当前生态系统中40至48°N的区域。使用区域海洋再分析模型输出和模型选择技术的输出来检验假设。四个海洋学变量解释了征聘变化的73％，而这一变化没有完全根据产卵种群的估计数来解释。招聘偏差与（a）雌性前提条件时期的度数正相关，（b）与卵期的混合层深度正相关，（c）幼体期的跨层运输负相关，以及（d ）与底栖少年阶段跨架运输呈负相关。虽然多种机制可能会在其生命史上的不同时间影响海的唯一招募，但这种关系的强度对于种群评估和综合生态系统评估应用是有希望的。招聘偏差与（a）雌性前提条件时期的度数正相关，（b）与卵期的混合层深度正相关，（c）幼体期的跨层运输负相关，以及（d ）与底栖少年阶段跨架运输呈负相关。虽然多种机制可能会在其生命史上的不同时间影响海的唯一招募，但这种关系的强度对于种群评估和综合生态系统评估应用是有希望的。招聘偏差与（a）雌性前提条件时期的度数正相关，（b）与卵期的混合层深度正相关，（c）幼体期的跨层运输负相关，以及（d ）与底栖少年阶段跨架运输呈负相关。虽然多种机制可能会在其生命史上的不同时间影响海的唯一招募，但这种关系的强度对于种群评估和综合生态系统评估应用是有希望的。（d）在底栖少年阶段与跨架运输负相关。虽然多种机制可能会在其生命史上的不同时间影响海的唯一招募，但这种关系的强度对于种群评估和综合生态系统评估应用是有希望的。（d）在底栖少年阶段与跨架运输负相关。尽管多种机制可能会在其生命史上的不同时间点影响海的唯一招募，但这种关系的强度对于种群评估和综合生态系统评估应用而言是有希望的。