Understanding the spatial ecology of juvenile freshwater fish beyond summer months is an essential component of their life history puzzle. To this end, declines in the natural populations of sympatric Muskellunge (Esox masquinongy) and Northern Pike (Esox lucius) in the upper St. Lawrence River prompted study of spatiotemporal patterns and habitat requirements associated with earlier life stages of these congeneric, freshwater predators in fall and overwinter periods. Over 75 age‐0 esocids were tagged and passively monitored using acoustic telemetry in four nursery embayments in fall and winter months from 2015 and 2017 months to elucidate spatiotemporal ecology and test hypotheses related to emigration. Presence, residency, space and habitat use were assessed and modelled against key environmental (i.e. water temperature and level) and biological (total length) covariates using mixed effect models. Muskellunge were found to spend more time in deeper, littoral regions with canopy‐forming, submerged aquatic vegetation while Northern Pike aggregated in the deepest, highly vegetated region of their nursery embayment. Results suggest fish may exhibit transitionary movements in fall months and may span outwards into nearshore regions along the main river channel. Studies informing coastal restoration initiatives to increase Muskellunge production are encouraged to assess sympatric habitat use relative to prominent embayment structures and further explore depth partitioning by these young predators. With a substantial influence from water‐level regulation on use of nursery habitat, future studies must work in concert with management plans aimed at producing more natural riverine cycles and thus increased recruitment of Esox species.

中文翻译：

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圣劳伦斯河上游育苗湾幼鱼（Esox masquinongy）和北梭鱼（Esox lucius）在秋季和冬季就职期间的时空生态学

了解夏季以外的淡水幼鱼的空间生态是它们生活史谜题的重要组成部分。为此，圣劳伦斯河上游同域鲭鱼 (Esox masquinongy) 和北梭鱼 (Esox lucius) 自然种群的减少促使研究与这些同类淡水食肉动物早期生命阶段相关的时空模式和栖息地要求。秋季和越冬时期。在 2015 年和 2017 年秋季和冬季的四个月中，使用声学遥测技术对超过 75 只 0 岁的 esocids 进行了标记和被动监测，以阐明时空生态并检验与移民相关的假设。对存在、居住、空间和栖息地的使用进行了评估，并根据关键环境（即 水温和水位）和生物（总长度）协变量使用混合效应模型。Muskellunge 被发现在更深的沿海地区花费更多的时间，这些地区有形成树冠的淹没水生植被，而北派克则聚集在其苗圃海湾最深、植被丰富的地区。结果表明，鱼类可能在秋季月份表现出过渡性运动，并可能沿着主要河道向外延伸到近岸区域。鼓励为增加 Muskellunge 生产提供沿海恢复计划的研究，以评估相对于突出的海湾结构的同域栖息地使用，并进一步探索这些年轻捕食者的深度划分。受水位调节对育苗栖息地利用的重大影响，