The complexity and spatio–temporal scale of populations’ dynamics influence how populations respond to large‐scale ecological pressures. Detecting and attributing synchrony (i.e. temporally coincident fluctuations in populations’ parameters) is key as synchronous populations can become more vulnerable to stochastic events that can affect the viability of harvest and have profound consequences to community structure. Here, we aimed to estimate the level of synchrony in fish growth within and among species across 1 million km² and identify the environmental drivers contributing to synchronous population fluctuations. We developed otolith increment‐based growth chronologies for two deep‐sea scorpaenid fishes (Helicolenus dactylopterus and Pontinus kuhlii) from geographically and bathymetrically disjunct populations in the northeast Atlantic (one species in three locations; two species with different depth preferences). We used hierarchical models to partition variation in growth within and between populations attributing it to intrinsic (age, species, population) and extrinsic (environmental variables) drivers. We assessed synchrony in growth variation within and among species and identified common change points in population specific growth patterns. We documented time‐variant synchrony in growth variation of geographically and bathymetrically segregated deep‐sea fish populations, lasting 25 and 18 years, respectively. The observed synchrony was likely driven by shared environmental forcing (Moran effect) as large‐scale climate indices (East Atlantic pattern and North Atlantic Oscillation) were important environmental drivers of overall growth variation while the onset of synchrony in growth variation was likely related to marine regime shifts occurring in a wide area of the northeast Atlantic that affected the entire ecosystem. However, our capacity to extrapolate growth information across species and locations was dependent on the timing and magnitude of environmental change. Developing a better understanding of the mechanisms driving growth synchrony is key to ensure sustainable management of populations in habitats that are fragile and highly sensible to environmental change, such as the deep‐sea.

中文翻译：

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海洋政权转移影响东北大西洋深海鱼类生长的同步性

人口动态的复杂性和时空尺度影响人口如何应对大规模生态压力。由于同步种群可能更容易受到随机事件的影响，这些随机事件会影响收获的生存能力并对社区结构产生深远影响，因此检测和归因同步（即种群参数的时间上同时发生的波动）是关键。在这里，我们的目的是估计内和跨百万公里物种之间的同步性在鱼的生长水平²和识别环境的驱动有助于同步人口波动。我们为两种深海蝎鱼（Helicolenus dactylopterus和Pontinus kuhlii）开发了基于耳石增量的生长时间表）来自东北大西洋的地理和测深分离种群（三个物种中的一个物种;两个深度偏好不同的物种）。我们使用层次模型对种群内部和种群之间的增长变化进行划分，将其归因于内在（年龄，物种，种群）和外在（环境变量）驱动因素。我们评估了物种内和物种间生长变化的同步性，并确定了特定种群生长模式的共同变化点。我们记录了分别持续25年和18年的按地理和水深划分的深海鱼类种群的生长变化的时变同步。观测到的同步可能是由共同的环境强迫（莫兰效应）驱动的，因为大规模气候指数（东大西洋格局和北大西洋涛动）是整体增长变化的重要环境驱动因素，而增长变化的同步发生可能与海洋环境有关。在东北大西洋的广大地区发生的政权转移影响了整个生态系统。但是，我们推断物种和位置的生长信息的能力取决于环境变化的时机和程度。更好地理解推动增长同步的机制，对于确保对脆弱和对环境变化高度敏感的生境（如深海）中的种群可持续管理至关重要。